TY  - CONF
AU  - Vasilić, Violeta
AU  - Brajović, Ljiljana
AU  - Petković, Dušan
AU  - Blagojević, Dragan
PY  - 2023
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3229
AB  - The propagation of the Global Navigation Satellite System (GNSS) signals through the atmosphere is affected by the electron content in the ionosphere and the air density in the electrically neutral troposphere, thus causing a signal delay and leading to errors in the GNSS observations and the estimated positions. 	Our research has been conducted related to the influence of the tropospheric layer of the Earth's atmosphere on signals at geodetic observation stations in the zenith direction. Since tropospheric refraction cannot be directly estimated, the signal delay has been quantified by applying several developed models. As the lowest layer of the atmosphere, the average height of the troposphere is approximately ten kilometers, and it is variable concerning the latitude of the measuring station and seasonal conditions. The tropospheric delay of the GNSS signal - Zenith Total Delay (ZTD), was analyzed on the examples of three International GNSS Service (IGS) stations at different latitudes. Two epochs in July 2022 and January 2023 for each IGS station are considered regarding seasonal differences in the atmospheric parameters. It was found that at each of the IGS stations, there is an oscillation of the ZTD amplitude with a half-day period. Different patterns were distinguished at each station, depending on the station latitude and epoch, i.e., summer or winter atmospheric conditions. For example, a random walk signal was dominant at the ROAG, San Fernando IGS station.
PB  - Faculty of Civil Engineering, University of Belgrade and Institute of Physics Belgrade, University of Belgrade
C3  - Book of Abstracts and Contributed Papers, International Conference on Recent Trends in Geoscience Research and Applications, Belgrade, October 23–27, 2023
T1  - Tropospheric refraction and its influence through Zenith Total Path Delay at different IGS stations
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3229
ER  - 

@conference{
author = "Vasilić, Violeta and Brajović, Ljiljana and Petković, Dušan and Blagojević, Dragan",
year = "2023",
abstract = "The propagation of the Global Navigation Satellite System (GNSS) signals through the atmosphere is affected by the electron content in the ionosphere and the air density in the electrically neutral troposphere, thus causing a signal delay and leading to errors in the GNSS observations and the estimated positions. 	Our research has been conducted related to the influence of the tropospheric layer of the Earth's atmosphere on signals at geodetic observation stations in the zenith direction. Since tropospheric refraction cannot be directly estimated, the signal delay has been quantified by applying several developed models. As the lowest layer of the atmosphere, the average height of the troposphere is approximately ten kilometers, and it is variable concerning the latitude of the measuring station and seasonal conditions. The tropospheric delay of the GNSS signal - Zenith Total Delay (ZTD), was analyzed on the examples of three International GNSS Service (IGS) stations at different latitudes. Two epochs in July 2022 and January 2023 for each IGS station are considered regarding seasonal differences in the atmospheric parameters. It was found that at each of the IGS stations, there is an oscillation of the ZTD amplitude with a half-day period. Different patterns were distinguished at each station, depending on the station latitude and epoch, i.e., summer or winter atmospheric conditions. For example, a random walk signal was dominant at the ROAG, San Fernando IGS station.",
publisher = "Faculty of Civil Engineering, University of Belgrade and Institute of Physics Belgrade, University of Belgrade",
journal = "Book of Abstracts and Contributed Papers, International Conference on Recent Trends in Geoscience Research and Applications, Belgrade, October 23–27, 2023",
title = "Tropospheric refraction and its influence through Zenith Total Path Delay at different IGS stations",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3229"
}

Vasilić, V., Brajović, L., Petković, D.,& Blagojević, D.. (2023). Tropospheric refraction and its influence through Zenith Total Path Delay at different IGS stations. in Book of Abstracts and Contributed Papers, International Conference on Recent Trends in Geoscience Research and Applications, Belgrade, October 23–27, 2023
Faculty of Civil Engineering, University of Belgrade and Institute of Physics Belgrade, University of Belgrade..
https://hdl.handle.net/21.15107/rcub_grafar_3229

Vasilić V, Brajović L, Petković D, Blagojević D. Tropospheric refraction and its influence through Zenith Total Path Delay at different IGS stations. in Book of Abstracts and Contributed Papers, International Conference on Recent Trends in Geoscience Research and Applications, Belgrade, October 23–27, 2023. 2023;.
https://hdl.handle.net/21.15107/rcub_grafar_3229 .

Vasilić, Violeta, Brajović, Ljiljana, Petković, Dušan, Blagojević, Dragan, "Tropospheric refraction and its influence through Zenith Total Path Delay at different IGS stations" in Book of Abstracts and Contributed Papers, International Conference on Recent Trends in Geoscience Research and Applications, Belgrade, October 23–27, 2023 (2023),
https://hdl.handle.net/21.15107/rcub_grafar_3229 .

TY  - GEN
AU  - Vasilić, Violeta
AU  - Blagojević, Dragan
AU  - Marinković, Marko
PY  - 2022
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3254
AB  - The main source of the seismic energy on the territory of the Republic of Serbia is connected with the primary tectonic contact between the Eurasian and African/Arabian plates along the coast of the Adriatic Sea and the Balkan Peninsula. This geotectonic collision -compression contact represents a source of tectonic stress whose accumulated energy is transmitting to his background and is realized in the form of earthquakes. 
Based on the available seismic hazard maps, considering both different return periods of macroseismic intensity and different seismic zones, displacement fields of various civil engineering structures (i.e. large reinforced concrete frame or shear wall buildings, bridge structures etc.) will be assessed using an approach based on the precise geodetic observations.
The permanent CORS GPS network of Serbia with an average stations distance of 60 km is used as a basis for monitoring and determining the values of ground deformations and objects displacements. The permanent stations network will be more spatially densified in each specific area by the appropriate stations of the SREF network (average stations distance 10 km) and the local network points of the civil engineering structures individually. 
In this way each local stations network of the construction objects particularly, should be specially designed depending on the given conditions of this civil engineering structures which will allow a better understanding of seismological impacts.
T2  - 20th WEGENER GENERAL ASSEMBLY, Measuring and Modelling our Dznamic Planet, Integration of Geodetic, Tectonic and Seismological Data to Better Understand Earthquakes and The Earthquake Cycle
T1  - Contribution to better understanding of seismological impacts in large civil engineering structures
UR  - https://hdl.handle.net/21.15107/rcub_grafar_3254
ER  - 

@misc{
author = "Vasilić, Violeta and Blagojević, Dragan and Marinković, Marko",
year = "2022",
abstract = "The main source of the seismic energy on the territory of the Republic of Serbia is connected with the primary tectonic contact between the Eurasian and African/Arabian plates along the coast of the Adriatic Sea and the Balkan Peninsula. This geotectonic collision -compression contact represents a source of tectonic stress whose accumulated energy is transmitting to his background and is realized in the form of earthquakes. 
Based on the available seismic hazard maps, considering both different return periods of macroseismic intensity and different seismic zones, displacement fields of various civil engineering structures (i.e. large reinforced concrete frame or shear wall buildings, bridge structures etc.) will be assessed using an approach based on the precise geodetic observations.
The permanent CORS GPS network of Serbia with an average stations distance of 60 km is used as a basis for monitoring and determining the values of ground deformations and objects displacements. The permanent stations network will be more spatially densified in each specific area by the appropriate stations of the SREF network (average stations distance 10 km) and the local network points of the civil engineering structures individually. 
In this way each local stations network of the construction objects particularly, should be specially designed depending on the given conditions of this civil engineering structures which will allow a better understanding of seismological impacts.",
journal = "20th WEGENER GENERAL ASSEMBLY, Measuring and Modelling our Dznamic Planet, Integration of Geodetic, Tectonic and Seismological Data to Better Understand Earthquakes and The Earthquake Cycle",
title = "Contribution to better understanding of seismological impacts in large civil engineering structures",
url = "https://hdl.handle.net/21.15107/rcub_grafar_3254"
}

Vasilić, V., Blagojević, D.,& Marinković, M.. (2022). Contribution to better understanding of seismological impacts in large civil engineering structures. in 20th WEGENER GENERAL ASSEMBLY, Measuring and Modelling our Dznamic Planet, Integration of Geodetic, Tectonic and Seismological Data to Better Understand Earthquakes and The Earthquake Cycle.
https://hdl.handle.net/21.15107/rcub_grafar_3254

Vasilić V, Blagojević D, Marinković M. Contribution to better understanding of seismological impacts in large civil engineering structures. in 20th WEGENER GENERAL ASSEMBLY, Measuring and Modelling our Dznamic Planet, Integration of Geodetic, Tectonic and Seismological Data to Better Understand Earthquakes and The Earthquake Cycle. 2022;.
https://hdl.handle.net/21.15107/rcub_grafar_3254 .

Vasilić, Violeta, Blagojević, Dragan, Marinković, Marko, "Contribution to better understanding of seismological impacts in large civil engineering structures" in 20th WEGENER GENERAL ASSEMBLY, Measuring and Modelling our Dznamic Planet, Integration of Geodetic, Tectonic and Seismological Data to Better Understand Earthquakes and The Earthquake Cycle (2022),
https://hdl.handle.net/21.15107/rcub_grafar_3254 .

TY  - CONF
AU  - Filipović, Aljoša
AU  - Dobrić, Jelena
AU  - Blagojević, Dragan
AU  - Samardžić - Petrović, Mileva
AU  - Buđevac, Dragan
AU  - Marković, Zlatko
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2609
AB  - Rad  prikazuje  merenje  početnih  geometrijskih  imperfekcija  i  zaostalih  napona  u  okviru 
istraživanja nosivosti centrično pritisnutih elemenata L poprečnog preseka od nerđajućeg čelika. 
Istraživanjem su obuhvaćena tri različita tipa L profila – hladnooblikovani, vrućevaljani i laserski 
zavareni. Postupak i rezultati merenja početnih geometrijskih imperfekcija primenom sistema za 
lasersko merenje prezentovani su u radu. Merenje zaostalih napona metodom sečenja sprovedeno 
je  na  vrućevaljanom  i  laserski  zavarenom  uzorku  nominalnih  dimenzija  100  ×  100  ×  10, 
napraveljenih od austenitnog nerđajućeg čelika EN 1.4301. Postupak merenja zaostalih napona 
i rezultati u formi rasporeda zaostalih napona i ekstremnih vrednosti prikazni su u radu.
AB  - The paper presents initial geometric imperfections and residual stresses measurment as a part of 
a research on ultimate capacity of axially compressed angle columns made from stainless steel. 
The research covers three different angle types – cold-formed, hot-rolled and laser-welded. The 
procedure and results of initial geometric imperfections measurments using a laser measurement 
system are presented. Measurement of residual stresses using a sectioning method was performed 
on hot-rolled and laser-welded samples with nominal dimensions of 100 × 100 × 10, made of 
austenitic  stainless  steel  EN  1.4301.  The  procedure  of  residual  stresses  measurement  and 
obtained results in form of residual stresses distribution and extreme values are presented.
PB  - Univerzitet u Beogradu Građevinski fakultet
PB  - Društvo građevinskih konstruktera Srbije
C3  - Zbornik radova sa Nacionalnog simpozijuma DGKS  / Društvо  građevinskih konstruktera Srbije, Simpozijum 2020
T1  - Početne imperfekcije stubova ravnokrakog L poprečnog preseka od nerđajućeg čelika
EP  - 521
SP  - 513
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2609
ER  - 

@conference{
author = "Filipović, Aljoša and Dobrić, Jelena and Blagojević, Dragan and Samardžić - Petrović, Mileva and Buđevac, Dragan and Marković, Zlatko",
year = "2021",
abstract = "Rad  prikazuje  merenje  početnih  geometrijskih  imperfekcija  i  zaostalih  napona  u  okviru 
istraživanja nosivosti centrično pritisnutih elemenata L poprečnog preseka od nerđajućeg čelika. 
Istraživanjem su obuhvaćena tri različita tipa L profila – hladnooblikovani, vrućevaljani i laserski 
zavareni. Postupak i rezultati merenja početnih geometrijskih imperfekcija primenom sistema za 
lasersko merenje prezentovani su u radu. Merenje zaostalih napona metodom sečenja sprovedeno 
je  na  vrućevaljanom  i  laserski  zavarenom  uzorku  nominalnih  dimenzija  100  ×  100  ×  10, 
napraveljenih od austenitnog nerđajućeg čelika EN 1.4301. Postupak merenja zaostalih napona 
i rezultati u formi rasporeda zaostalih napona i ekstremnih vrednosti prikazni su u radu., The paper presents initial geometric imperfections and residual stresses measurment as a part of 
a research on ultimate capacity of axially compressed angle columns made from stainless steel. 
The research covers three different angle types – cold-formed, hot-rolled and laser-welded. The 
procedure and results of initial geometric imperfections measurments using a laser measurement 
system are presented. Measurement of residual stresses using a sectioning method was performed 
on hot-rolled and laser-welded samples with nominal dimensions of 100 × 100 × 10, made of 
austenitic  stainless  steel  EN  1.4301.  The  procedure  of  residual  stresses  measurement  and 
obtained results in form of residual stresses distribution and extreme values are presented.",
publisher = "Univerzitet u Beogradu Građevinski fakultet, Društvo građevinskih konstruktera Srbije",
journal = "Zbornik radova sa Nacionalnog simpozijuma DGKS  / Društvо  građevinskih konstruktera Srbije, Simpozijum 2020",
title = "Početne imperfekcije stubova ravnokrakog L poprečnog preseka od nerđajućeg čelika",
pages = "521-513",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2609"
}

Filipović, A., Dobrić, J., Blagojević, D., Samardžić - Petrović, M., Buđevac, D.,& Marković, Z.. (2021). Početne imperfekcije stubova ravnokrakog L poprečnog preseka od nerđajućeg čelika. in Zbornik radova sa Nacionalnog simpozijuma DGKS  / Društvо  građevinskih konstruktera Srbije, Simpozijum 2020
Univerzitet u Beogradu Građevinski fakultet., 513-521.
https://hdl.handle.net/21.15107/rcub_grafar_2609

Filipović A, Dobrić J, Blagojević D, Samardžić - Petrović M, Buđevac D, Marković Z. Početne imperfekcije stubova ravnokrakog L poprečnog preseka od nerđajućeg čelika. in Zbornik radova sa Nacionalnog simpozijuma DGKS  / Društvо  građevinskih konstruktera Srbije, Simpozijum 2020. 2021;:513-521.
https://hdl.handle.net/21.15107/rcub_grafar_2609 .

Filipović, Aljoša, Dobrić, Jelena, Blagojević, Dragan, Samardžić - Petrović, Mileva, Buđevac, Dragan, Marković, Zlatko, "Početne imperfekcije stubova ravnokrakog L poprečnog preseka od nerđajućeg čelika" in Zbornik radova sa Nacionalnog simpozijuma DGKS  / Društvо  građevinskih konstruktera Srbije, Simpozijum 2020 (2021):513-521,
https://hdl.handle.net/21.15107/rcub_grafar_2609 .

TY  - JOUR
AU  - Luković, Jelena
AU  - Chiang, John C. H.
AU  - Blagojević, Dragan
AU  - Sekulić, Aleksandar
PY  - 2021
UR  - https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2020GL090350
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2356
AB  - Californian hydroclimate is strongly seasonal and prone to severe water shortages. Recent changes in climate trends have induced shifts in seasonality, thus exacerbating droughts, wildfires, and adverse water shortage effects on the environment and economy. Previous studies have examined the timing of the seasonal cycle shifts mainly as temperature driven earlier onset of the spring season. In this paper, we address quantitative changes in the onset, amounts, and termination of the precipitation season over the past 6 decades, as well as the large‐scale atmospheric circulation underpinning the seasonal cycle changes. We discover that the onset of the rainy season has been progressively delayed since the 1960s, and as a result the precipitation season has become shorter and sharper in California. The progressively later onset of the rainy season is shown to be related to the summer circulation pattern extending into autumn across the North Pacific, in particular, a delay in the strengthening of the Aleutian Low and later southward displacement of the North Pacific westerlies.
PB  - American Geophysical Union,  John Wiley & Sons
T2  - Geophysical Research Letters
T1  - A Later Onset of the Rainy Season in California
IS  - e2020GL090350
VL  - 48
DO  - 10.1029/2020GL090350
ER  - 

@article{
author = "Luković, Jelena and Chiang, John C. H. and Blagojević, Dragan and Sekulić, Aleksandar",
year = "2021",
abstract = "Californian hydroclimate is strongly seasonal and prone to severe water shortages. Recent changes in climate trends have induced shifts in seasonality, thus exacerbating droughts, wildfires, and adverse water shortage effects on the environment and economy. Previous studies have examined the timing of the seasonal cycle shifts mainly as temperature driven earlier onset of the spring season. In this paper, we address quantitative changes in the onset, amounts, and termination of the precipitation season over the past 6 decades, as well as the large‐scale atmospheric circulation underpinning the seasonal cycle changes. We discover that the onset of the rainy season has been progressively delayed since the 1960s, and as a result the precipitation season has become shorter and sharper in California. The progressively later onset of the rainy season is shown to be related to the summer circulation pattern extending into autumn across the North Pacific, in particular, a delay in the strengthening of the Aleutian Low and later southward displacement of the North Pacific westerlies.",
publisher = "American Geophysical Union,  John Wiley & Sons",
journal = "Geophysical Research Letters",
title = "A Later Onset of the Rainy Season in California",
number = "e2020GL090350",
volume = "48",
doi = "10.1029/2020GL090350"
}

Luković, J., Chiang, J. C. H., Blagojević, D.,& Sekulić, A.. (2021). A Later Onset of the Rainy Season in California. in Geophysical Research Letters
American Geophysical Union,  John Wiley & Sons., 48(e2020GL090350).
https://doi.org/10.1029/2020GL090350

Luković J, Chiang JCH, Blagojević D, Sekulić A. A Later Onset of the Rainy Season in California. in Geophysical Research Letters. 2021;48(e2020GL090350).
doi:10.1029/2020GL090350 .

Luković, Jelena, Chiang, John C. H., Blagojević, Dragan, Sekulić, Aleksandar, "A Later Onset of the Rainy Season in California" in Geophysical Research Letters, 48, no. e2020GL090350 (2021),
https://doi.org/10.1029/2020GL090350 . .

TY  - CONF
AU  - Blagojević, Dragana
AU  - Stojković, Stefanija
AU  - Brdar, Sanja
AU  - Crnojević, Vladimir
PY  - 2021
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/3182
AB  - This research aimed to inspect the correlation coefficients, during the crop growth stages, between vegetation indices (VIs) derived from Sentinel-2 imagery and grain winter wheat yield derived from yield monitoring and select the most promising indices for monitoring crop growth and yield estimation. METHOD / DESIGN: The satellite images in 10m resolution were selected based on crop growth stages, from the end of tillering phase (beginning of March 2019) until the full ripening (end of June 2019). For the analysis, the BBCH-scale for cereals was used. Yield observations were performed at harvest on five fields in one season and twelve VIs were calculated across 10 growth stages. To designate their correlation and dependence, a statistical comparison of the VIs and yield was made. The Pearson’s and Spearman’s correlation coefficients were calculated, and their statistical significance was tested using p-value (at p=0.01, p=0.05). RESULTS: According to the crop growth stages, the highest correlation coefficients were detected from the early boot stage (BBCH 41) until the middle of development of the fruiting stage (BBCH 73 – early milk). In that period the correlation coefficients varied from 0.39 to 0.84 depending on the field. Based on the location, the highest correlation coefficient values for all 12 indices were recorded for the parcel named C-6 (April 15), and the lowest values for the parcel named C-10 (June 29). Most of the indices showed statistically significant dependence (at the p<0.01 and p<0.05 significant levels) on the yield in the first five growth stages except the chlorophyll vegetation index (CVI) for the parcel named C-11 (p=0.21, p=0.39). CONCLUSIONS: To conclude, the last growth stage named ripening showed the lowest values both for correlation coefficient and statistical significance which means that VIs also had low values because the reflectance is weak in this growth stage and wheat is about to be harvested. In the first five stages, VIs showed significantly high spectral reflectance values since in this period the leaf is full of chlorophyll pigments. Analyzing the correlation coefficient in different stages of wheat growth, we look at the current state of crops and have the opportunity to take appropriate measures in time to increase yields or save inputs at specific locations.
PB  - BioSense Institute, Novi Sad
C3  - International Bioscience Conference and the 8th International PSU – UNS Bioscience Conference
T1  - Within-field correlation between satellite-derived vegetation indices and grain yield of wheat
SP  - 218
DO  - 10.13140/RG.2.2.22001.20324
ER  - 

@conference{
author = "Blagojević, Dragana and Stojković, Stefanija and Brdar, Sanja and Crnojević, Vladimir",
year = "2021",
abstract = "This research aimed to inspect the correlation coefficients, during the crop growth stages, between vegetation indices (VIs) derived from Sentinel-2 imagery and grain winter wheat yield derived from yield monitoring and select the most promising indices for monitoring crop growth and yield estimation. METHOD / DESIGN: The satellite images in 10m resolution were selected based on crop growth stages, from the end of tillering phase (beginning of March 2019) until the full ripening (end of June 2019). For the analysis, the BBCH-scale for cereals was used. Yield observations were performed at harvest on five fields in one season and twelve VIs were calculated across 10 growth stages. To designate their correlation and dependence, a statistical comparison of the VIs and yield was made. The Pearson’s and Spearman’s correlation coefficients were calculated, and their statistical significance was tested using p-value (at p=0.01, p=0.05). RESULTS: According to the crop growth stages, the highest correlation coefficients were detected from the early boot stage (BBCH 41) until the middle of development of the fruiting stage (BBCH 73 – early milk). In that period the correlation coefficients varied from 0.39 to 0.84 depending on the field. Based on the location, the highest correlation coefficient values for all 12 indices were recorded for the parcel named C-6 (April 15), and the lowest values for the parcel named C-10 (June 29). Most of the indices showed statistically significant dependence (at the p<0.01 and p<0.05 significant levels) on the yield in the first five growth stages except the chlorophyll vegetation index (CVI) for the parcel named C-11 (p=0.21, p=0.39). CONCLUSIONS: To conclude, the last growth stage named ripening showed the lowest values both for correlation coefficient and statistical significance which means that VIs also had low values because the reflectance is weak in this growth stage and wheat is about to be harvested. In the first five stages, VIs showed significantly high spectral reflectance values since in this period the leaf is full of chlorophyll pigments. Analyzing the correlation coefficient in different stages of wheat growth, we look at the current state of crops and have the opportunity to take appropriate measures in time to increase yields or save inputs at specific locations.",
publisher = "BioSense Institute, Novi Sad",
journal = "International Bioscience Conference and the 8th International PSU – UNS Bioscience Conference",
title = "Within-field correlation between satellite-derived vegetation indices and grain yield of wheat",
pages = "218",
doi = "10.13140/RG.2.2.22001.20324"
}

Blagojević, D., Stojković, S., Brdar, S.,& Crnojević, V.. (2021). Within-field correlation between satellite-derived vegetation indices and grain yield of wheat. in International Bioscience Conference and the 8th International PSU – UNS Bioscience Conference
BioSense Institute, Novi Sad., 218.
https://doi.org/10.13140/RG.2.2.22001.20324

Blagojević D, Stojković S, Brdar S, Crnojević V. Within-field correlation between satellite-derived vegetation indices and grain yield of wheat. in International Bioscience Conference and the 8th International PSU – UNS Bioscience Conference. 2021;:218.
doi:10.13140/RG.2.2.22001.20324 .

Blagojević, Dragana, Stojković, Stefanija, Brdar, Sanja, Crnojević, Vladimir, "Within-field correlation between satellite-derived vegetation indices and grain yield of wheat" in International Bioscience Conference and the 8th International PSU – UNS Bioscience Conference (2021):218,
https://doi.org/10.13140/RG.2.2.22001.20324 . .

TY  - JOUR
AU  - Vasiljević, Slavko
AU  - Vasić, Dejan
AU  - Odalović, Oleg
AU  - Blagojević, Dragan
AU  - Milovanović, Branko
PY  - 2020
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2005
AB  - The paper describes the optimal model for coordinate transformation between ETRS89 and old national reference system in the Republic of Srpska. The Helmert`s parameters were estimated, based on a set of 1 741 common points. The average magnitude of residuals was 0.3 m per coordinate and the residual vectors were homogeneous at the local level. The basic model was complemented by a corrections grid that uses bilinear interpolation. The accuracy of the transformed horizontal positions obtained by this model is about 10 cm. In this way, a link between the ETRS89 and local reference system has been established on the overall territory of the Republic of Srpska.
PB  - Taylor & Francis
T2  - Survey Review
T1  - Horizontal coordinates transformation and residuals modelling on the territory of the Republic of Srpska
DO  - 10.1080/00396265.2020.1781357
ER  - 

@article{
author = "Vasiljević, Slavko and Vasić, Dejan and Odalović, Oleg and Blagojević, Dragan and Milovanović, Branko",
year = "2020",
abstract = "The paper describes the optimal model for coordinate transformation between ETRS89 and old national reference system in the Republic of Srpska. The Helmert`s parameters were estimated, based on a set of 1 741 common points. The average magnitude of residuals was 0.3 m per coordinate and the residual vectors were homogeneous at the local level. The basic model was complemented by a corrections grid that uses bilinear interpolation. The accuracy of the transformed horizontal positions obtained by this model is about 10 cm. In this way, a link between the ETRS89 and local reference system has been established on the overall territory of the Republic of Srpska.",
publisher = "Taylor & Francis",
journal = "Survey Review",
title = "Horizontal coordinates transformation and residuals modelling on the territory of the Republic of Srpska",
doi = "10.1080/00396265.2020.1781357"
}

Vasiljević, S., Vasić, D., Odalović, O., Blagojević, D.,& Milovanović, B.. (2020). Horizontal coordinates transformation and residuals modelling on the territory of the Republic of Srpska. in Survey Review
Taylor & Francis..
https://doi.org/10.1080/00396265.2020.1781357

Vasiljević S, Vasić D, Odalović O, Blagojević D, Milovanović B. Horizontal coordinates transformation and residuals modelling on the territory of the Republic of Srpska. in Survey Review. 2020;.
doi:10.1080/00396265.2020.1781357 .

Vasiljević, Slavko, Vasić, Dejan, Odalović, Oleg, Blagojević, Dragan, Milovanović, Branko, "Horizontal coordinates transformation and residuals modelling on the territory of the Republic of Srpska" in Survey Review (2020),
https://doi.org/10.1080/00396265.2020.1781357 . .

TY  - JOUR
AU  - Todorović-Drakul, Miljana
AU  - Samardžić-Petrović, Mileva
AU  - Grekulović, Sanja
AU  - Odalović, Oleg
AU  - Blagojević, Dragan
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/955
AB  - This paper is dedicated to modeling extreme TEC (Total Electron Content) values at the territory of Serbia. For the extreme TEC values, we consider the maximum values from the peak of the 11-year cycle of solar activity in the years 2013, 2014 and 2015 for the days of the winter and summer solstice and autumnal and vernal equinox. The average TEC values between 10 and 12 UT (Universal Time) were treated. As the basic data for all processing, we used GNSS (Global Navigation Satellite System) observation obtained by three permanent stations located in the territory of Serbia. Those data, we accept as actual, i. e. as a "true TEC values". The main objectives of this research were to examine the possibility to use two machine learning techniques: neural networks and support vector machine. In order to emphasize the quality of applied techniques, all results are adequately compared to the TEC values obtained by using International Reference Ionosphere global model. In addition, we separately analyzed the quality of techniques throughout temporal and spatial-temporal approach.
PB  - Geofizicki Zavod
T2  - Geofizika
T1  - Modelling extreme values of the total electron content: Case study of Serbia
EP  - 314
IS  - 2
SP  - 297
VL  - 34
DO  - 10.15233/gfz.2017.34.12
ER  - 

@article{
author = "Todorović-Drakul, Miljana and Samardžić-Petrović, Mileva and Grekulović, Sanja and Odalović, Oleg and Blagojević, Dragan",
year = "2018",
abstract = "This paper is dedicated to modeling extreme TEC (Total Electron Content) values at the territory of Serbia. For the extreme TEC values, we consider the maximum values from the peak of the 11-year cycle of solar activity in the years 2013, 2014 and 2015 for the days of the winter and summer solstice and autumnal and vernal equinox. The average TEC values between 10 and 12 UT (Universal Time) were treated. As the basic data for all processing, we used GNSS (Global Navigation Satellite System) observation obtained by three permanent stations located in the territory of Serbia. Those data, we accept as actual, i. e. as a "true TEC values". The main objectives of this research were to examine the possibility to use two machine learning techniques: neural networks and support vector machine. In order to emphasize the quality of applied techniques, all results are adequately compared to the TEC values obtained by using International Reference Ionosphere global model. In addition, we separately analyzed the quality of techniques throughout temporal and spatial-temporal approach.",
publisher = "Geofizicki Zavod",
journal = "Geofizika",
title = "Modelling extreme values of the total electron content: Case study of Serbia",
pages = "314-297",
number = "2",
volume = "34",
doi = "10.15233/gfz.2017.34.12"
}

Todorović-Drakul, M., Samardžić-Petrović, M., Grekulović, S., Odalović, O.,& Blagojević, D.. (2018). Modelling extreme values of the total electron content: Case study of Serbia. in Geofizika
Geofizicki Zavod., 34(2), 297-314.
https://doi.org/10.15233/gfz.2017.34.12

Todorović-Drakul M, Samardžić-Petrović M, Grekulović S, Odalović O, Blagojević D. Modelling extreme values of the total electron content: Case study of Serbia. in Geofizika. 2018;34(2):297-314.
doi:10.15233/gfz.2017.34.12 .

Todorović-Drakul, Miljana, Samardžić-Petrović, Mileva, Grekulović, Sanja, Odalović, Oleg, Blagojević, Dragan, "Modelling extreme values of the total electron content: Case study of Serbia" in Geofizika, 34, no. 2 (2018):297-314,
https://doi.org/10.15233/gfz.2017.34.12 . .

TY  - CONF
AU  - Todorović-Drakul, Miljana
AU  - Samardžić-Petrović, Mileva
AU  - Grekulović, Sanja
AU  - Odalović, Oleg
AU  - Blagojević, Dragan
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1430
PB  - Faculty of Civil Engineering, Belgrade
C3  - Proceedings of GeoMLA, Geostatistics and Machine Learning, Application in Climate and Environmental Sciences, Belgrade, Serbia 21-24 June 2016
T1  - Total electron content prediction using machine learning techniques
EP  - 44
SP  - 40
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1430
ER  - 

@conference{
author = "Todorović-Drakul, Miljana and Samardžić-Petrović, Mileva and Grekulović, Sanja and Odalović, Oleg and Blagojević, Dragan",
year = "2016",
publisher = "Faculty of Civil Engineering, Belgrade",
journal = "Proceedings of GeoMLA, Geostatistics and Machine Learning, Application in Climate and Environmental Sciences, Belgrade, Serbia 21-24 June 2016",
title = "Total electron content prediction using machine learning techniques",
pages = "44-40",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1430"
}

Todorović-Drakul, M., Samardžić-Petrović, M., Grekulović, S., Odalović, O.,& Blagojević, D.. (2016). Total electron content prediction using machine learning techniques. in Proceedings of GeoMLA, Geostatistics and Machine Learning, Application in Climate and Environmental Sciences, Belgrade, Serbia 21-24 June 2016
Faculty of Civil Engineering, Belgrade., 40-44.
https://hdl.handle.net/21.15107/rcub_grafar_1430

Todorović-Drakul M, Samardžić-Petrović M, Grekulović S, Odalović O, Blagojević D. Total electron content prediction using machine learning techniques. in Proceedings of GeoMLA, Geostatistics and Machine Learning, Application in Climate and Environmental Sciences, Belgrade, Serbia 21-24 June 2016. 2016;:40-44.
https://hdl.handle.net/21.15107/rcub_grafar_1430 .

Todorović-Drakul, Miljana, Samardžić-Petrović, Mileva, Grekulović, Sanja, Odalović, Oleg, Blagojević, Dragan, "Total electron content prediction using machine learning techniques" in Proceedings of GeoMLA, Geostatistics and Machine Learning, Application in Climate and Environmental Sciences, Belgrade, Serbia 21-24 June 2016 (2016):40-44,
https://hdl.handle.net/21.15107/rcub_grafar_1430 .

TY  - JOUR
AU  - Blagojević, Dragan
AU  - Todorović-Drakul, Miljana
AU  - Odalović, Oleg
AU  - Grekulović, Sanja
AU  - Popović, Jovan
AU  - Joksimović, Danilo
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/804
AB  - To understand general ionosphere properties over Serbia, an analysis of temporal and spatial ionosphere Total Electron Content (TEC) over the region was performed. The present research focuses on daily, seasonal and spatial ionosphere variations, based on TEC series calculated from the GNSS ie. GPS measurements. This analysis provides for characterization of ionosphere nature and fine structure over Serbia, both locally and regionally. For the days with high solar activity changes of TEC values ranges from minimum 4 Total Electron Content Units (TECU), in night hours, up to 55 TECU around the noon. It is shown that that changes are equivalent to the to the delay of GPS signals approximately 8.8 m in in vertical direction during the (maximum) daily conditions and the delay of 0.6 m during the (minimum) night conditions. Also, it is shows that a seasonal TEC differences follows directly Son activity during the seasons, and maximal differences of TEC values between the seasons reaching values of 45 TECU, again in the years of high Son's activities. For spatial changes all gained results indicate that there exist changes in all directions which cannot be recognized as constant bias or a trend.
PB  - Zvava Geodetov Slovenije
T2  - Geodetski vestnik
T1  - Variations of total electron content over Serbia during the increased solar activity period in 2013 and 2014
EP  - 744
IS  - 4
SP  - 734
VL  - 60
DO  - 10.15292/geodetski-vestnik.2016.04.734-744
ER  - 

@article{
author = "Blagojević, Dragan and Todorović-Drakul, Miljana and Odalović, Oleg and Grekulović, Sanja and Popović, Jovan and Joksimović, Danilo",
year = "2016",
abstract = "To understand general ionosphere properties over Serbia, an analysis of temporal and spatial ionosphere Total Electron Content (TEC) over the region was performed. The present research focuses on daily, seasonal and spatial ionosphere variations, based on TEC series calculated from the GNSS ie. GPS measurements. This analysis provides for characterization of ionosphere nature and fine structure over Serbia, both locally and regionally. For the days with high solar activity changes of TEC values ranges from minimum 4 Total Electron Content Units (TECU), in night hours, up to 55 TECU around the noon. It is shown that that changes are equivalent to the to the delay of GPS signals approximately 8.8 m in in vertical direction during the (maximum) daily conditions and the delay of 0.6 m during the (minimum) night conditions. Also, it is shows that a seasonal TEC differences follows directly Son activity during the seasons, and maximal differences of TEC values between the seasons reaching values of 45 TECU, again in the years of high Son's activities. For spatial changes all gained results indicate that there exist changes in all directions which cannot be recognized as constant bias or a trend.",
publisher = "Zvava Geodetov Slovenije",
journal = "Geodetski vestnik",
title = "Variations of total electron content over Serbia during the increased solar activity period in 2013 and 2014",
pages = "744-734",
number = "4",
volume = "60",
doi = "10.15292/geodetski-vestnik.2016.04.734-744"
}

Blagojević, D., Todorović-Drakul, M., Odalović, O., Grekulović, S., Popović, J.,& Joksimović, D.. (2016). Variations of total electron content over Serbia during the increased solar activity period in 2013 and 2014. in Geodetski vestnik
Zvava Geodetov Slovenije., 60(4), 734-744.
https://doi.org/10.15292/geodetski-vestnik.2016.04.734-744

Blagojević D, Todorović-Drakul M, Odalović O, Grekulović S, Popović J, Joksimović D. Variations of total electron content over Serbia during the increased solar activity period in 2013 and 2014. in Geodetski vestnik. 2016;60(4):734-744.
doi:10.15292/geodetski-vestnik.2016.04.734-744 .

Blagojević, Dragan, Todorović-Drakul, Miljana, Odalović, Oleg, Grekulović, Sanja, Popović, Jovan, Joksimović, Danilo, "Variations of total electron content over Serbia during the increased solar activity period in 2013 and 2014" in Geodetski vestnik, 60, no. 4 (2016):734-744,
https://doi.org/10.15292/geodetski-vestnik.2016.04.734-744 . .

TY  - JOUR
AU  - Nikitović, Vladimir
AU  - Bajat, Branislav
AU  - Blagojević, Dragan
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/749
AB  - This study considers the spatial and temporal dimensions of demographic trends in Serbia between 1961 and 2010. Using appropriate spatial autocorrelation statistics, spatial patterns of common demographic indicators including changes in population size, the rate of natural increase and infant mortality rate are investigated across municipalities of Serbia. Also, the impact of differential demographic rates according to ethnic origin on forming spatial clusters is implicitly considered. Different stages of demographic transition across municipalities at the start of the analyzed period determined the spatial pattern of clustered subregions; ethnic origin appeared to be a strong factor of differentiation regarding population dynamics. The two opposed areas regarding the transition of rates of natural increase and infant mortality were clustered; the southern included Kosovo and the least developed subregions of Central Serbia. The City of Belgrade and Kosovo have been the two hubs of population growth in Serbia over the past 50 years, while the strongest depopulation refers to the north and east border regions.
PB  - Ceska Geograficka Spolecnost
T2  - Geografie-Sbornik CGS
T1  - Spatial patterns of recent demographic trends in Serbia (1961-2010)
EP  - 543
IS  - 4
SP  - 521
VL  - 121
UR  - https://hdl.handle.net/21.15107/rcub_grafar_749
ER  - 

@article{
author = "Nikitović, Vladimir and Bajat, Branislav and Blagojević, Dragan",
year = "2016",
abstract = "This study considers the spatial and temporal dimensions of demographic trends in Serbia between 1961 and 2010. Using appropriate spatial autocorrelation statistics, spatial patterns of common demographic indicators including changes in population size, the rate of natural increase and infant mortality rate are investigated across municipalities of Serbia. Also, the impact of differential demographic rates according to ethnic origin on forming spatial clusters is implicitly considered. Different stages of demographic transition across municipalities at the start of the analyzed period determined the spatial pattern of clustered subregions; ethnic origin appeared to be a strong factor of differentiation regarding population dynamics. The two opposed areas regarding the transition of rates of natural increase and infant mortality were clustered; the southern included Kosovo and the least developed subregions of Central Serbia. The City of Belgrade and Kosovo have been the two hubs of population growth in Serbia over the past 50 years, while the strongest depopulation refers to the north and east border regions.",
publisher = "Ceska Geograficka Spolecnost",
journal = "Geografie-Sbornik CGS",
title = "Spatial patterns of recent demographic trends in Serbia (1961-2010)",
pages = "543-521",
number = "4",
volume = "121",
url = "https://hdl.handle.net/21.15107/rcub_grafar_749"
}

Nikitović, V., Bajat, B.,& Blagojević, D.. (2016). Spatial patterns of recent demographic trends in Serbia (1961-2010). in Geografie-Sbornik CGS
Ceska Geograficka Spolecnost., 121(4), 521-543.
https://hdl.handle.net/21.15107/rcub_grafar_749

Nikitović V, Bajat B, Blagojević D. Spatial patterns of recent demographic trends in Serbia (1961-2010). in Geografie-Sbornik CGS. 2016;121(4):521-543.
https://hdl.handle.net/21.15107/rcub_grafar_749 .

Nikitović, Vladimir, Bajat, Branislav, Blagojević, Dragan, "Spatial patterns of recent demographic trends in Serbia (1961-2010)" in Geografie-Sbornik CGS, 121, no. 4 (2016):521-543,
https://hdl.handle.net/21.15107/rcub_grafar_749 .

TY  - JOUR
AU  - Todorović-Drakul, Miljana
AU  - Cadez, V.M.
AU  - Bajcetić, J.
AU  - Popović, L. C.
AU  - Blagojević, Dragan
AU  - Nina, A.
PY  - 2016
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/736
AB  - One of the most important parameters in ionospheric plasma research, also having a wide practical application in wireless satellite telecommunications, is the total electron content (TEC) representing the columnal electron number density. The F-region with high electron density provides the biggest contribution to TEC while the relatively weakly ionized plasma of the D-region (60 km 90 km above Earth's surface) is often considered as a negligible cause of satellite signal disturbances. However, sudden intensive ionization processes, like those induced by solar X-ray flares, can cause relative increases of electron density that are significantly larger in the D-region than in regions at higher altitudes. Therefore, one cannot exclude a priori the D-region from investigations of ionospheric influences on propagation of electromagnetic signals emitted by satellites. We discuss here this problem which has not been sufficiently treated in literature so far. The obtained results are based on data collected from the D-region monitoring by very low frequency radio waves and on vertical TEC calculations from the Global Navigation Satellite System (GNSS) signal analyses, and they show noticeable variations in the D-region's electron content (TECD) during activity of a solar X-ray flare (it rises by a factor of 136 in the considered case) when TECD contribution to TEC can reach several percent and which cannot be neglected in practical applications like global positioning procedures by satellites.
PB  - Astronomska opservatorija, Beograd i Univerzitet u Beogradu - Matematički fakultet - Odeljenje za astronomiju, Beograd
T2  - Serbian Astronomical Journal
T1  - Behaviour of electron content in the ionospheric d-region during solar x-ray flares
EP  - 18
SP  - 11
VL  - 193
DO  - 10.2298/SAJ160404006T
ER  - 

@article{
author = "Todorović-Drakul, Miljana and Cadez, V.M. and Bajcetić, J. and Popović, L. C. and Blagojević, Dragan and Nina, A.",
year = "2016",
abstract = "One of the most important parameters in ionospheric plasma research, also having a wide practical application in wireless satellite telecommunications, is the total electron content (TEC) representing the columnal electron number density. The F-region with high electron density provides the biggest contribution to TEC while the relatively weakly ionized plasma of the D-region (60 km 90 km above Earth's surface) is often considered as a negligible cause of satellite signal disturbances. However, sudden intensive ionization processes, like those induced by solar X-ray flares, can cause relative increases of electron density that are significantly larger in the D-region than in regions at higher altitudes. Therefore, one cannot exclude a priori the D-region from investigations of ionospheric influences on propagation of electromagnetic signals emitted by satellites. We discuss here this problem which has not been sufficiently treated in literature so far. The obtained results are based on data collected from the D-region monitoring by very low frequency radio waves and on vertical TEC calculations from the Global Navigation Satellite System (GNSS) signal analyses, and they show noticeable variations in the D-region's electron content (TECD) during activity of a solar X-ray flare (it rises by a factor of 136 in the considered case) when TECD contribution to TEC can reach several percent and which cannot be neglected in practical applications like global positioning procedures by satellites.",
publisher = "Astronomska opservatorija, Beograd i Univerzitet u Beogradu - Matematički fakultet - Odeljenje za astronomiju, Beograd",
journal = "Serbian Astronomical Journal",
title = "Behaviour of electron content in the ionospheric d-region during solar x-ray flares",
pages = "18-11",
volume = "193",
doi = "10.2298/SAJ160404006T"
}

Todorović-Drakul, M., Cadez, V.M., Bajcetić, J., Popović, L. C., Blagojević, D.,& Nina, A.. (2016). Behaviour of electron content in the ionospheric d-region during solar x-ray flares. in Serbian Astronomical Journal
Astronomska opservatorija, Beograd i Univerzitet u Beogradu - Matematički fakultet - Odeljenje za astronomiju, Beograd., 193, 11-18.
https://doi.org/10.2298/SAJ160404006T

Todorović-Drakul M, Cadez V, Bajcetić J, Popović LC, Blagojević D, Nina A. Behaviour of electron content in the ionospheric d-region during solar x-ray flares. in Serbian Astronomical Journal. 2016;193:11-18.
doi:10.2298/SAJ160404006T .

Todorović-Drakul, Miljana, Cadez, V.M., Bajcetić, J., Popović, L. C., Blagojević, Dragan, Nina, A., "Behaviour of electron content in the ionospheric d-region during solar x-ray flares" in Serbian Astronomical Journal, 193 (2016):11-18,
https://doi.org/10.2298/SAJ160404006T . .

TY  - CHAP
AU  - Vasilić, Violeta
AU  - Blagojević, Dragan
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1034
PB  - Cham: Springer International Publishing
T2  - IAG 150 Years
T1  - Expression of the Local GPS Solution in the Regional Reference Frame ETRF2000
EP  - 116
SP  - 111
VL  - 143
DO  - 10.1007/1345_2015_34
ER  - 

@inbook{
author = "Vasilić, Violeta and Blagojević, Dragan",
year = "2015",
publisher = "Cham: Springer International Publishing",
journal = "IAG 150 Years",
booktitle = "Expression of the Local GPS Solution in the Regional Reference Frame ETRF2000",
pages = "116-111",
volume = "143",
doi = "10.1007/1345_2015_34"
}

Vasilić, V.,& Blagojević, D.. (2015). Expression of the Local GPS Solution in the Regional Reference Frame ETRF2000. in IAG 150 Years
Cham: Springer International Publishing., 143, 111-116.
https://doi.org/10.1007/1345_2015_34

Vasilić V, Blagojević D. Expression of the Local GPS Solution in the Regional Reference Frame ETRF2000. in IAG 150 Years. 2015;143:111-116.
doi:10.1007/1345_2015_34 .

Vasilić, Violeta, Blagojević, Dragan, "Expression of the Local GPS Solution in the Regional Reference Frame ETRF2000" in IAG 150 Years, 143 (2015):111-116,
https://doi.org/10.1007/1345_2015_34 . .

TY  - JOUR
AU  - Bajat, Branislav
AU  - Blagojević, Dragan
AU  - Kilibarda, Milan
AU  - Luković, Jelena
AU  - Tosić, Ivana
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/721
AB  - The spatial analysis of annual and seasonal temperature trends in Serbia during the period 1961-2010 was carried out using mean monthly data from 64 meteorological stations. Change year detection was achieved using cumulative sum charts. The magnitude of trends was derived from the slopes of linear trends using the least square method. The same formalism of least square method was used to assess the statistical significance of the determined trends. Maps of temperature trends were generated by applying a spatial regression method to visualize the detected tendencies. The obtained results indicate a negative temperature trend for the period before the change year except for winter and a more pronounced positive trend after the change year. Besides being more pronounced, the vast majority of trends after the change year were also clearly statistically significant. Our estimate of the average temperature trend over Serbia is in agreement with those obtained at the global and European scale. Calculated global autocorrelation statistics (Moran's I) indicate an apparent random spatial pattern of temperature trends across the Serbia for both periods before and after the change year.
PB  - Springer-Verlag Wien
T2  - Theoretical and Applied Climatology
T1  - Spatial analysis of the temperature trends in Serbia during the period 1961-2010
EP  - 301
IS  - 1-2
SP  - 289
VL  - 121
DO  - 10.1007/s00704-014-1243-7
ER  - 

@article{
author = "Bajat, Branislav and Blagojević, Dragan and Kilibarda, Milan and Luković, Jelena and Tosić, Ivana",
year = "2015",
abstract = "The spatial analysis of annual and seasonal temperature trends in Serbia during the period 1961-2010 was carried out using mean monthly data from 64 meteorological stations. Change year detection was achieved using cumulative sum charts. The magnitude of trends was derived from the slopes of linear trends using the least square method. The same formalism of least square method was used to assess the statistical significance of the determined trends. Maps of temperature trends were generated by applying a spatial regression method to visualize the detected tendencies. The obtained results indicate a negative temperature trend for the period before the change year except for winter and a more pronounced positive trend after the change year. Besides being more pronounced, the vast majority of trends after the change year were also clearly statistically significant. Our estimate of the average temperature trend over Serbia is in agreement with those obtained at the global and European scale. Calculated global autocorrelation statistics (Moran's I) indicate an apparent random spatial pattern of temperature trends across the Serbia for both periods before and after the change year.",
publisher = "Springer-Verlag Wien",
journal = "Theoretical and Applied Climatology",
title = "Spatial analysis of the temperature trends in Serbia during the period 1961-2010",
pages = "301-289",
number = "1-2",
volume = "121",
doi = "10.1007/s00704-014-1243-7"
}

Bajat, B., Blagojević, D., Kilibarda, M., Luković, J.,& Tosić, I.. (2015). Spatial analysis of the temperature trends in Serbia during the period 1961-2010. in Theoretical and Applied Climatology
Springer-Verlag Wien., 121(1-2), 289-301.
https://doi.org/10.1007/s00704-014-1243-7

Bajat B, Blagojević D, Kilibarda M, Luković J, Tosić I. Spatial analysis of the temperature trends in Serbia during the period 1961-2010. in Theoretical and Applied Climatology. 2015;121(1-2):289-301.
doi:10.1007/s00704-014-1243-7 .

Bajat, Branislav, Blagojević, Dragan, Kilibarda, Milan, Luković, Jelena, Tosić, Ivana, "Spatial analysis of the temperature trends in Serbia during the period 1961-2010" in Theoretical and Applied Climatology, 121, no. 1-2 (2015):289-301,
https://doi.org/10.1007/s00704-014-1243-7 . .

TY  - JOUR
AU  - Luković, Jelena
AU  - Blagojević, Dragan
AU  - Kilibarda, Milan
AU  - Bajat, Branislav
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/726
AB  - This study examines the spatial pattern of relationships between annual, seasonal and monthly rainfall in Serbia, and the North Atlantic Oscillation (NAO) for the period of 1961-2009. The first correlation analysis between rainfall and the NAO was performed using a Pearson product-moment test. Results suggested negative, mainly statistically significant correlations at annual and winter scales as was expected. However, the highest percentage of stations showed significant result in October suggesting a strong impact of a large scale atmospheric mode throughout a wet season in Serbia. Further spatial analysis that incorporated a spatial autocorrelation statistic of correlation coefficients showed significant clustering at all temporal scales.
PB  - Elsevier
T2  - Spatial Statistics
T1  - Spatial pattern of North Atlantic Oscillation impact on rainfall in Serbia
EP  - 52
SP  - 39
VL  - 14
DO  - 10.1016/j.spasta.2015.04.007
ER  - 

@article{
author = "Luković, Jelena and Blagojević, Dragan and Kilibarda, Milan and Bajat, Branislav",
year = "2015",
abstract = "This study examines the spatial pattern of relationships between annual, seasonal and monthly rainfall in Serbia, and the North Atlantic Oscillation (NAO) for the period of 1961-2009. The first correlation analysis between rainfall and the NAO was performed using a Pearson product-moment test. Results suggested negative, mainly statistically significant correlations at annual and winter scales as was expected. However, the highest percentage of stations showed significant result in October suggesting a strong impact of a large scale atmospheric mode throughout a wet season in Serbia. Further spatial analysis that incorporated a spatial autocorrelation statistic of correlation coefficients showed significant clustering at all temporal scales.",
publisher = "Elsevier",
journal = "Spatial Statistics",
title = "Spatial pattern of North Atlantic Oscillation impact on rainfall in Serbia",
pages = "52-39",
volume = "14",
doi = "10.1016/j.spasta.2015.04.007"
}

Luković, J., Blagojević, D., Kilibarda, M.,& Bajat, B.. (2015). Spatial pattern of North Atlantic Oscillation impact on rainfall in Serbia. in Spatial Statistics
Elsevier., 14, 39-52.
https://doi.org/10.1016/j.spasta.2015.04.007

Luković J, Blagojević D, Kilibarda M, Bajat B. Spatial pattern of North Atlantic Oscillation impact on rainfall in Serbia. in Spatial Statistics. 2015;14:39-52.
doi:10.1016/j.spasta.2015.04.007 .

Luković, Jelena, Blagojević, Dragan, Kilibarda, Milan, Bajat, Branislav, "Spatial pattern of North Atlantic Oscillation impact on rainfall in Serbia" in Spatial Statistics, 14 (2015):39-52,
https://doi.org/10.1016/j.spasta.2015.04.007 . .

TY  - JOUR
AU  - Luković, Jelena
AU  - Bajat, Branislav
AU  - Blagojević, Dragan
AU  - Kilibarda, Milan
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/616
AB  - This paper examines a spatial pattern of annual, seasonal and monthly rainfall trends in Serbia. The study used data from 63 weather stations between the period of 1961-2009. The rainfall series was examined by applying the nonparametric method of the Mann-Kendall test and Sen's method to determine the significance and magnitude of the trends. Significant trends have not been detected for the whole country at an annual scale. Seasonal trends at the confidence level of 97.5 %, however, indicate a slight decrease in winter (5 stations out of 63) and spring (7 stations out of 63) precipitation and an increase in autumn precipitation (10 stations out of 63). Results for monthly rainfall trends also generally showed a nonsignificant trend with the exception of a negative trend in May (6 stations out of 63) and positive trend for October (9 stations out of 63). Calculated global autocorrelation statistics (Moran's I) indicate a random spatial pattern of rainfall trends on annual, seasonal and monthly timescales with exceptions for March, June and November. Overall, results suggest that only weak, mostly nonsignificant trends are present in Serbia in the period 1961-2009.
PB  - Springer Verlag
T2  - Regional Environmental Change
T1  - Spatial pattern of recent rainfall trends in Serbia (1961-2009)
EP  - 1799
IS  - 5
SP  - 1789
VL  - 14
DO  - 10.1007/s10113-013-0459-x
ER  - 

@article{
author = "Luković, Jelena and Bajat, Branislav and Blagojević, Dragan and Kilibarda, Milan",
year = "2014",
abstract = "This paper examines a spatial pattern of annual, seasonal and monthly rainfall trends in Serbia. The study used data from 63 weather stations between the period of 1961-2009. The rainfall series was examined by applying the nonparametric method of the Mann-Kendall test and Sen's method to determine the significance and magnitude of the trends. Significant trends have not been detected for the whole country at an annual scale. Seasonal trends at the confidence level of 97.5 %, however, indicate a slight decrease in winter (5 stations out of 63) and spring (7 stations out of 63) precipitation and an increase in autumn precipitation (10 stations out of 63). Results for monthly rainfall trends also generally showed a nonsignificant trend with the exception of a negative trend in May (6 stations out of 63) and positive trend for October (9 stations out of 63). Calculated global autocorrelation statistics (Moran's I) indicate a random spatial pattern of rainfall trends on annual, seasonal and monthly timescales with exceptions for March, June and November. Overall, results suggest that only weak, mostly nonsignificant trends are present in Serbia in the period 1961-2009.",
publisher = "Springer Verlag",
journal = "Regional Environmental Change",
title = "Spatial pattern of recent rainfall trends in Serbia (1961-2009)",
pages = "1799-1789",
number = "5",
volume = "14",
doi = "10.1007/s10113-013-0459-x"
}

Luković, J., Bajat, B., Blagojević, D.,& Kilibarda, M.. (2014). Spatial pattern of recent rainfall trends in Serbia (1961-2009). in Regional Environmental Change
Springer Verlag., 14(5), 1789-1799.
https://doi.org/10.1007/s10113-013-0459-x

Luković J, Bajat B, Blagojević D, Kilibarda M. Spatial pattern of recent rainfall trends in Serbia (1961-2009). in Regional Environmental Change. 2014;14(5):1789-1799.
doi:10.1007/s10113-013-0459-x .

Luković, Jelena, Bajat, Branislav, Blagojević, Dragan, Kilibarda, Milan, "Spatial pattern of recent rainfall trends in Serbia (1961-2009)" in Regional Environmental Change, 14, no. 5 (2014):1789-1799,
https://doi.org/10.1007/s10113-013-0459-x . .

TY  - CONF
AU  - Odalović, Oleg
AU  - Grekulović, Sanja
AU  - Al-gharabli, Hamza
AU  - Blagojević, Dragan
AU  - Vasilić, Violeta
AU  - Naod, Sofija
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2237
AB  - This study compares a series of global geopotential models (GGMs) using
available terrestrial data from the territory of Libya. The anomalies of free air were
determined in points of gravimetric survey of Libya by using the model of European Improved
Gravity 6C2 (EIGEN-6C2), the model of the Earth Gravitational Model 2008 (EGM2008), as
well as model of the Earth Gravitational Model 1996 (EGM96). The points of gravimetric
survey of Libya are related to International Terrestrial Reference Frame (ITRF2000),
Geodetic Reference System 1980 (GRS80), International Gravity Standardization Net 1971
(IGSN71) and the levelling network of Libya. Free air anomalies were evaluated at the points
of gravimetric survey. Along with all mentioned above the results gained by using said models
were separately compared with the data obtained by using the Earth Gravitational Model
(EGM96).
PB  - RevCAD Journal of Geodesy and Cadastre
C3  - GEOMAT 2013, Scientific Conference with International Participation, Romania
T1  - Comparison of global geopotential models with Terrestrial gravity data in Libya
SP  - 181
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2237
ER  - 

@conference{
author = "Odalović, Oleg and Grekulović, Sanja and Al-gharabli, Hamza and Blagojević, Dragan and Vasilić, Violeta and Naod, Sofija",
year = "2013",
abstract = "This study compares a series of global geopotential models (GGMs) using
available terrestrial data from the territory of Libya. The anomalies of free air were
determined in points of gravimetric survey of Libya by using the model of European Improved
Gravity 6C2 (EIGEN-6C2), the model of the Earth Gravitational Model 2008 (EGM2008), as
well as model of the Earth Gravitational Model 1996 (EGM96). The points of gravimetric
survey of Libya are related to International Terrestrial Reference Frame (ITRF2000),
Geodetic Reference System 1980 (GRS80), International Gravity Standardization Net 1971
(IGSN71) and the levelling network of Libya. Free air anomalies were evaluated at the points
of gravimetric survey. Along with all mentioned above the results gained by using said models
were separately compared with the data obtained by using the Earth Gravitational Model
(EGM96).",
publisher = "RevCAD Journal of Geodesy and Cadastre",
journal = "GEOMAT 2013, Scientific Conference with International Participation, Romania",
title = "Comparison of global geopotential models with Terrestrial gravity data in Libya",
pages = "181",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2237"
}

Odalović, O., Grekulović, S., Al-gharabli, H., Blagojević, D., Vasilić, V.,& Naod, S.. (2013). Comparison of global geopotential models with Terrestrial gravity data in Libya. in GEOMAT 2013, Scientific Conference with International Participation, Romania
RevCAD Journal of Geodesy and Cadastre., 181.
https://hdl.handle.net/21.15107/rcub_grafar_2237

Odalović O, Grekulović S, Al-gharabli H, Blagojević D, Vasilić V, Naod S. Comparison of global geopotential models with Terrestrial gravity data in Libya. in GEOMAT 2013, Scientific Conference with International Participation, Romania. 2013;:181.
https://hdl.handle.net/21.15107/rcub_grafar_2237 .

Odalović, Oleg, Grekulović, Sanja, Al-gharabli, Hamza, Blagojević, Dragan, Vasilić, Violeta, Naod, Sofija, "Comparison of global geopotential models with Terrestrial gravity data in Libya" in GEOMAT 2013, Scientific Conference with International Participation, Romania (2013):181,
https://hdl.handle.net/21.15107/rcub_grafar_2237 .

TY  - CONF
AU  - Naod, Sofija
AU  - Grekulović, Sanja
AU  - Vasilić, Violeta
AU  - Odalović, Oleg
AU  - Blagojević, Dragan
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2236
AB  - National GPS permanent network of Serbia - Aktivna Geodetska Referentna Osnova Srbije (AGROS) was established in the end of 2005. referring to the ITRF96, where the official geodetic reference system of Serbia was Bessel ellipsoid and Gauss-Krüger projec-tion. The new reference system ETRS89, through its realization ETRF2000 was introduced from 1th January 2011, according to the Law of the State Survey and Cadastre. This paper describes the main activities for the establishement of new Terrestrial Reference Frame, both from mathematical and practical point of views, and in particular station velocity of AGROS network.
PB  - Državna geodetska uprava, Gruška 20, HR-10000 Zagreb
PB  - Sveučilište u Zagrebu Geodetski fakultet, Kačićeva 26, HR-10000 Zagreb
PB  - Hrvatska komora ovlaštenih inženjera geodezije, Ul. Grada Vukovara 271/II, HR-10000 Zagreb
C3  - Zbornik radova 3. CROPOS konferencije
T1  - Terrestrial reference frame of Serbia and its temporal rate
SP  - 70
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2236
ER  - 

@conference{
author = "Naod, Sofija and Grekulović, Sanja and Vasilić, Violeta and Odalović, Oleg and Blagojević, Dragan",
year = "2013",
abstract = "National GPS permanent network of Serbia - Aktivna Geodetska Referentna Osnova Srbije (AGROS) was established in the end of 2005. referring to the ITRF96, where the official geodetic reference system of Serbia was Bessel ellipsoid and Gauss-Krüger projec-tion. The new reference system ETRS89, through its realization ETRF2000 was introduced from 1th January 2011, according to the Law of the State Survey and Cadastre. This paper describes the main activities for the establishement of new Terrestrial Reference Frame, both from mathematical and practical point of views, and in particular station velocity of AGROS network.",
publisher = "Državna geodetska uprava, Gruška 20, HR-10000 Zagreb, Sveučilište u Zagrebu Geodetski fakultet, Kačićeva 26, HR-10000 Zagreb, Hrvatska komora ovlaštenih inženjera geodezije, Ul. Grada Vukovara 271/II, HR-10000 Zagreb",
journal = "Zbornik radova 3. CROPOS konferencije",
title = "Terrestrial reference frame of Serbia and its temporal rate",
pages = "70",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2236"
}

Naod, S., Grekulović, S., Vasilić, V., Odalović, O.,& Blagojević, D.. (2013). Terrestrial reference frame of Serbia and its temporal rate. in Zbornik radova 3. CROPOS konferencije
Državna geodetska uprava, Gruška 20, HR-10000 Zagreb., 70.
https://hdl.handle.net/21.15107/rcub_grafar_2236

Naod S, Grekulović S, Vasilić V, Odalović O, Blagojević D. Terrestrial reference frame of Serbia and its temporal rate. in Zbornik radova 3. CROPOS konferencije. 2013;:70.
https://hdl.handle.net/21.15107/rcub_grafar_2236 .

Naod, Sofija, Grekulović, Sanja, Vasilić, Violeta, Odalović, Oleg, Blagojević, Dragan, "Terrestrial reference frame of Serbia and its temporal rate" in Zbornik radova 3. CROPOS konferencije (2013):70,
https://hdl.handle.net/21.15107/rcub_grafar_2236 .

TY  - CHAP
AU  - Blagojević, Dragan
AU  - Vasilić, Violeta
PY  - 2013
UR  - https://link.springer.com/chapter/10.1007%2F978-3-642-32998-2_21
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1934
AB  - Сажетак: У раду су приказани прелиминарни резултати анализе временских серија координата перманентне GNSS мреже станица Србије. Приказана је методологија анализе и кратко су објашњене резултујуће брзине станица. Тренд крусталне деформације је јасно идентификован, иако је коришћен кратки временски интервал, потврђујући тако могућности мреже перманентних станица за локалне и регионалне геодинамичке студије. Abstract. The paper presents preliminary results of coordinate time series analysis in the Serbian network of permanent GNSS stations. The analysis methodology is outlined and resulting station velocities are briefly commented. Despite the short time span used, the crustal deformation trend was clearly identified, confirming the potential of the network of permanent stations for local and regional geodynamical studies.
PB  - International Association of Geodesy, Zuheir Altamimi, Xavier  Collilieux
T2  - Reference Frames for Applications in Geosciences (Part III: Definition, Establishment, Maintenance and Integration of Regional Reference Frames)
T1  - The First Insight into Station Velocities in Republic of Serbia
VL  - 138
DO  - 10.1007/978-3-642-32998-2_21
ER  - 

@inbook{
author = "Blagojević, Dragan and Vasilić, Violeta",
year = "2013",
abstract = "Сажетак: У раду су приказани прелиминарни резултати анализе временских серија координата перманентне GNSS мреже станица Србије. Приказана је методологија анализе и кратко су објашњене резултујуће брзине станица. Тренд крусталне деформације је јасно идентификован, иако је коришћен кратки временски интервал, потврђујући тако могућности мреже перманентних станица за локалне и регионалне геодинамичке студије. Abstract. The paper presents preliminary results of coordinate time series analysis in the Serbian network of permanent GNSS stations. The analysis methodology is outlined and resulting station velocities are briefly commented. Despite the short time span used, the crustal deformation trend was clearly identified, confirming the potential of the network of permanent stations for local and regional geodynamical studies.",
publisher = "International Association of Geodesy, Zuheir Altamimi, Xavier  Collilieux",
journal = "Reference Frames for Applications in Geosciences (Part III: Definition, Establishment, Maintenance and Integration of Regional Reference Frames)",
booktitle = "The First Insight into Station Velocities in Republic of Serbia",
volume = "138",
doi = "10.1007/978-3-642-32998-2_21"
}

Blagojević, D.,& Vasilić, V.. (2013). The First Insight into Station Velocities in Republic of Serbia. in Reference Frames for Applications in Geosciences (Part III: Definition, Establishment, Maintenance and Integration of Regional Reference Frames)
International Association of Geodesy, Zuheir Altamimi, Xavier  Collilieux., 138.
https://doi.org/10.1007/978-3-642-32998-2_21

Blagojević D, Vasilić V. The First Insight into Station Velocities in Republic of Serbia. in Reference Frames for Applications in Geosciences (Part III: Definition, Establishment, Maintenance and Integration of Regional Reference Frames). 2013;138.
doi:10.1007/978-3-642-32998-2_21 .

Blagojević, Dragan, Vasilić, Violeta, "The First Insight into Station Velocities in Republic of Serbia" in Reference Frames for Applications in Geosciences (Part III: Definition, Establishment, Maintenance and Integration of Regional Reference Frames), 138 (2013),
https://doi.org/10.1007/978-3-642-32998-2_21 . .

TY  - CONF
AU  - Blagojević, Dragan
AU  - Vasilić, Violeta
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/519
AB  - The paper presents preliminary results of coordinate time series analysis in Serbian network of permanent GNSS stations. Analysis methodology is outlined and resulting station velocities are briefly commented. Despite the short time span used, the crustal deformation trend was clearly identified, confirming the potential of the network of permanent stations for local and regional geodynamical studies.
C3  - Reference Frames for Applications in Geosciences
T1  - The First Insight into Station Velocities in Republic of Serbia
EP  - 136
SP  - 133
VL  - 138
DO  - 10.1007/978-3-642-32998-2_21
ER  - 

@conference{
author = "Blagojević, Dragan and Vasilić, Violeta",
year = "2013",
abstract = "The paper presents preliminary results of coordinate time series analysis in Serbian network of permanent GNSS stations. Analysis methodology is outlined and resulting station velocities are briefly commented. Despite the short time span used, the crustal deformation trend was clearly identified, confirming the potential of the network of permanent stations for local and regional geodynamical studies.",
journal = "Reference Frames for Applications in Geosciences",
title = "The First Insight into Station Velocities in Republic of Serbia",
pages = "136-133",
volume = "138",
doi = "10.1007/978-3-642-32998-2_21"
}

Blagojević, D.,& Vasilić, V.. (2013). The First Insight into Station Velocities in Republic of Serbia. in Reference Frames for Applications in Geosciences, 138, 133-136.
https://doi.org/10.1007/978-3-642-32998-2_21

Blagojević D, Vasilić V. The First Insight into Station Velocities in Republic of Serbia. in Reference Frames for Applications in Geosciences. 2013;138:133-136.
doi:10.1007/978-3-642-32998-2_21 .

Blagojević, Dragan, Vasilić, Violeta, "The First Insight into Station Velocities in Republic of Serbia" in Reference Frames for Applications in Geosciences, 138 (2013):133-136,
https://doi.org/10.1007/978-3-642-32998-2_21 . .

TY  - CONF
AU  - Blagojević, Dragan
AU  - Todorović, Goran
AU  - Vasilić, Violeta
PY  - 2012
UR  - https://meetingorganizer.copernicus.org/EGU2012/poster_programme/9709
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1932
AB  - Сажетак: Предмет овог рада је истраживање доприноса временских серија GPS координата развоју Међународног Терестричког Референтног Фрејма ITRF. Анализа GPS сетова података би требало да детектује не само могуће трендове већ би такође требало да открије офсете или дисконтинуитете узроковане природним процесима као што су изненадна крустална померања или земљотреси као и оних померања која су нису узрокована природним догађајима, односно људском делатношћу.
Abstract. The subject of this paper is to investigate the contribution of GPS coordinate time series to the development of the International Terrestrial Reference Frame (ITRF). The analysis of the GPS data sets should not only detect possible trends but should also discover offsets or discontinuities caused by natural processes like sudden crustal movements and earthquakes, as well as those caused by artificial events and man-made activities.
This kind of analysis is important because it contributes to the understanding of Reference Frame stability and enables deeper insight into local, regional, and global geodynamical processes. The paper describes the strategy and some results obtained by the analysis of data from Reference GNSS stations located in the Republic of Serbia.
PB  - European Geosciences Union
C3  - European Geosciences Union General Assembly, Geodesy, Reference Frames and Geodetic Observing Systems
T1  - Assessment of Reference Frame Stability trough offset detection in GPS coordinate time series
VL  - Geophysical Research Abstracts, Vol. 14, Poster
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1932
ER  - 

@conference{
author = "Blagojević, Dragan and Todorović, Goran and Vasilić, Violeta",
year = "2012",
abstract = "Сажетак: Предмет овог рада је истраживање доприноса временских серија GPS координата развоју Међународног Терестричког Референтног Фрејма ITRF. Анализа GPS сетова података би требало да детектује не само могуће трендове већ би такође требало да открије офсете или дисконтинуитете узроковане природним процесима као што су изненадна крустална померања или земљотреси као и оних померања која су нису узрокована природним догађајима, односно људском делатношћу.
Abstract. The subject of this paper is to investigate the contribution of GPS coordinate time series to the development of the International Terrestrial Reference Frame (ITRF). The analysis of the GPS data sets should not only detect possible trends but should also discover offsets or discontinuities caused by natural processes like sudden crustal movements and earthquakes, as well as those caused by artificial events and man-made activities.
This kind of analysis is important because it contributes to the understanding of Reference Frame stability and enables deeper insight into local, regional, and global geodynamical processes. The paper describes the strategy and some results obtained by the analysis of data from Reference GNSS stations located in the Republic of Serbia.",
publisher = "European Geosciences Union",
journal = "European Geosciences Union General Assembly, Geodesy, Reference Frames and Geodetic Observing Systems",
title = "Assessment of Reference Frame Stability trough offset detection in GPS coordinate time series",
volume = "Geophysical Research Abstracts, Vol. 14, Poster",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1932"
}

Blagojević, D., Todorović, G.,& Vasilić, V.. (2012). Assessment of Reference Frame Stability trough offset detection in GPS coordinate time series. in European Geosciences Union General Assembly, Geodesy, Reference Frames and Geodetic Observing Systems
European Geosciences Union., Geophysical Research Abstracts, Vol. 14, Poster.
https://hdl.handle.net/21.15107/rcub_grafar_1932

Blagojević D, Todorović G, Vasilić V. Assessment of Reference Frame Stability trough offset detection in GPS coordinate time series. in European Geosciences Union General Assembly, Geodesy, Reference Frames and Geodetic Observing Systems. 2012;Geophysical Research Abstracts, Vol. 14, Poster.
https://hdl.handle.net/21.15107/rcub_grafar_1932 .

Blagojević, Dragan, Todorović, Goran, Vasilić, Violeta, "Assessment of Reference Frame Stability trough offset detection in GPS coordinate time series" in European Geosciences Union General Assembly, Geodesy, Reference Frames and Geodetic Observing Systems, Geophysical Research Abstracts, Vol. 14, Poster (2012),
https://hdl.handle.net/21.15107/rcub_grafar_1932 .

TY  - JOUR
AU  - Aleksić, Ivan R.
AU  - Odalović, Oleg
AU  - Blagojević, Dragan
PY  - 2010
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/300
AB  - The paper provides an overview of the strategic objectives for the development and maintenance of the State survey and real estate cadastre in Serbia for the years 2006-2015. We described project design and strategic objectives in details. Special attention was dedicated to the integrated strategy planning process. Effects of the achievement of the strategic objectives such as protection and security of real right, efficient, economical, quality and security of real estate market also were shown.
T2  - Survey Review
T1  - State survey and real estate cadastre in Serbia development and maintenance strategy
EP  - 396
IS  - 318
SP  - 388
VL  - 42
DO  - 10.1179/003962610X12747001420663
ER  - 

@article{
author = "Aleksić, Ivan R. and Odalović, Oleg and Blagojević, Dragan",
year = "2010",
abstract = "The paper provides an overview of the strategic objectives for the development and maintenance of the State survey and real estate cadastre in Serbia for the years 2006-2015. We described project design and strategic objectives in details. Special attention was dedicated to the integrated strategy planning process. Effects of the achievement of the strategic objectives such as protection and security of real right, efficient, economical, quality and security of real estate market also were shown.",
journal = "Survey Review",
title = "State survey and real estate cadastre in Serbia development and maintenance strategy",
pages = "396-388",
number = "318",
volume = "42",
doi = "10.1179/003962610X12747001420663"
}

Aleksić, I. R., Odalović, O.,& Blagojević, D.. (2010). State survey and real estate cadastre in Serbia development and maintenance strategy. in Survey Review, 42(318), 388-396.
https://doi.org/10.1179/003962610X12747001420663

Aleksić IR, Odalović O, Blagojević D. State survey and real estate cadastre in Serbia development and maintenance strategy. in Survey Review. 2010;42(318):388-396.
doi:10.1179/003962610X12747001420663 .

Aleksić, Ivan R., Odalović, Oleg, Blagojević, Dragan, "State survey and real estate cadastre in Serbia development and maintenance strategy" in Survey Review, 42, no. 318 (2010):388-396,
https://doi.org/10.1179/003962610X12747001420663 . .

TY  - JOUR
AU  - Blagojević, Dragan
AU  - Odalović, Oleg
AU  - Tesla, Nenad
AU  - Milenković, Vladimir
PY  - 2010
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/295
AB  - The paper provides an overview of height and gravity reference systems of Europe and a brief description of their implementation. For each system we have given definitions of the system, as well as changes in definitions over time. In paper we have briefly described European Vertical Reference System-EVRS, United European Leveling Network-UELN, European Vertical Reference Network as well as densification action - EUVN_DA. Gravimetric reference systems are described by the Potsdam reference system, through a system IGSN71 (International Gravity Standardization Network 1971), as well as a series of actions aimed at defining a new gravity reference systems of Europe.
AB  - U radu je dat pregled visinskih i gravimetrijskih referentnih sistema Evrope i kratak opis njihovih realizacija. U opisu svakog sistema date su definicije sistema, kao i promene definicija u vremenu. U pogledu visinskih sistema i mreža dati su kratki opisi EVROPSKOG VERTIKALNOG REFERENTNOG SISTEMA (European Vertical Reference System - EVRS), UJEDINjENE EVROPSKE NIVELMANSKE MREŽE (United European Leveling Network-UELN), EVROPSKE UJEDINjENE VER- TIKALNE MREŽE (European Vertical Reference Network-EUVN) i akcija koje se izvode u cilju njenog progušćavanja (European United Vertical Network - Densification Action - EUVN_DA). Gravimetrijski referentni sistemi opisani su od Potsdamskog referentnog sistema, preko sistema IGSN71 (International Gravity Standardization Network 1971), kao i nizom akcija u cilju definisanja novog referentnog gravimetrijskog sistema Evrope.
PB  - Republički geodetski zavod Srbije, Beograd
T2  - Geodetska služba
T1  - European vertical and gravimetric reference systems
T1  - Vertikalni i gravimetrijski referentni sistemi Evrope
EP  - 42
IS  - 113
SP  - 35
VL  - 39
UR  - https://hdl.handle.net/21.15107/rcub_grafar_295
ER  - 

@article{
author = "Blagojević, Dragan and Odalović, Oleg and Tesla, Nenad and Milenković, Vladimir",
year = "2010",
abstract = "The paper provides an overview of height and gravity reference systems of Europe and a brief description of their implementation. For each system we have given definitions of the system, as well as changes in definitions over time. In paper we have briefly described European Vertical Reference System-EVRS, United European Leveling Network-UELN, European Vertical Reference Network as well as densification action - EUVN_DA. Gravimetric reference systems are described by the Potsdam reference system, through a system IGSN71 (International Gravity Standardization Network 1971), as well as a series of actions aimed at defining a new gravity reference systems of Europe., U radu je dat pregled visinskih i gravimetrijskih referentnih sistema Evrope i kratak opis njihovih realizacija. U opisu svakog sistema date su definicije sistema, kao i promene definicija u vremenu. U pogledu visinskih sistema i mreža dati su kratki opisi EVROPSKOG VERTIKALNOG REFERENTNOG SISTEMA (European Vertical Reference System - EVRS), UJEDINjENE EVROPSKE NIVELMANSKE MREŽE (United European Leveling Network-UELN), EVROPSKE UJEDINjENE VER- TIKALNE MREŽE (European Vertical Reference Network-EUVN) i akcija koje se izvode u cilju njenog progušćavanja (European United Vertical Network - Densification Action - EUVN_DA). Gravimetrijski referentni sistemi opisani su od Potsdamskog referentnog sistema, preko sistema IGSN71 (International Gravity Standardization Network 1971), kao i nizom akcija u cilju definisanja novog referentnog gravimetrijskog sistema Evrope.",
publisher = "Republički geodetski zavod Srbije, Beograd",
journal = "Geodetska služba",
title = "European vertical and gravimetric reference systems, Vertikalni i gravimetrijski referentni sistemi Evrope",
pages = "42-35",
number = "113",
volume = "39",
url = "https://hdl.handle.net/21.15107/rcub_grafar_295"
}

Blagojević, D., Odalović, O., Tesla, N.,& Milenković, V.. (2010). European vertical and gravimetric reference systems. in Geodetska služba
Republički geodetski zavod Srbije, Beograd., 39(113), 35-42.
https://hdl.handle.net/21.15107/rcub_grafar_295

Blagojević D, Odalović O, Tesla N, Milenković V. European vertical and gravimetric reference systems. in Geodetska služba. 2010;39(113):35-42.
https://hdl.handle.net/21.15107/rcub_grafar_295 .

Blagojević, Dragan, Odalović, Oleg, Tesla, Nenad, Milenković, Vladimir, "European vertical and gravimetric reference systems" in Geodetska služba, 39, no. 113 (2010):35-42,
https://hdl.handle.net/21.15107/rcub_grafar_295 .

TY  - JOUR
AU  - Hengl, Tomislav
AU  - Bajat, Branislav
AU  - Blagojević, Dragan
AU  - Reuter, Hannes I.
PY  - 2008
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/201
AB  - This paper recommends computational procedures for employing auxiliary maps, such as maps of drainage patterns, land cover and remote-sensing-based indices, directly in the geostatistical modeling of topography. The methodology is based on the regression-kriging technique, as implemented in the R package gstat. The computational procedures are illustrated using a case study in the south-west part of Serbia. Two point data sets were used for geostatistical modeling: (I) 2051 elevation points were used to generate DEMs and (2) an independent error assessment data set (1020 points) was used to assess errors in the topo-DEM and the SRTM-DEM. Four auxiliary maps were used to improve generation of DEMs from point data: (1) distance to streams, (2) terrain complexity measured by standard deviation filter, (3) analytical hillshading map and (4) NDVI map derived from the Landsat image. The auxiliary predictors were significantly correlated with elevations (adj.R-2 = 0.20) and DEM errors (adj.R-2 = 0.27). By including auxiliary maps in the geostatistical modeling of topography, realizations of DEMs can be generated that represent geomorphology of a terrain more accurately. In addition, downscaling of a coarse 3 arcsec SRTM DEM using auxiliary maps and regression-kriging is demonstrated using the same case study. A methodological advantage of regression-kriging, compared to splines, is the possibility to automate the data processing and incorporate multiple auxiliary predictors. The remaining open issues are computational efficiency, application of local regression-kriging algorithms and preparation of suitable auxiliary data layers for such analyses.
T2  - Computers & Geosciences
T1  - Geostatistical modeling of topography using auxiliary maps
EP  - 1899
IS  - 12
SP  - 1886
VL  - 34
DO  - 10.1016/j.cageo.2008.01.005
ER  - 

@article{
author = "Hengl, Tomislav and Bajat, Branislav and Blagojević, Dragan and Reuter, Hannes I.",
year = "2008",
abstract = "This paper recommends computational procedures for employing auxiliary maps, such as maps of drainage patterns, land cover and remote-sensing-based indices, directly in the geostatistical modeling of topography. The methodology is based on the regression-kriging technique, as implemented in the R package gstat. The computational procedures are illustrated using a case study in the south-west part of Serbia. Two point data sets were used for geostatistical modeling: (I) 2051 elevation points were used to generate DEMs and (2) an independent error assessment data set (1020 points) was used to assess errors in the topo-DEM and the SRTM-DEM. Four auxiliary maps were used to improve generation of DEMs from point data: (1) distance to streams, (2) terrain complexity measured by standard deviation filter, (3) analytical hillshading map and (4) NDVI map derived from the Landsat image. The auxiliary predictors were significantly correlated with elevations (adj.R-2 = 0.20) and DEM errors (adj.R-2 = 0.27). By including auxiliary maps in the geostatistical modeling of topography, realizations of DEMs can be generated that represent geomorphology of a terrain more accurately. In addition, downscaling of a coarse 3 arcsec SRTM DEM using auxiliary maps and regression-kriging is demonstrated using the same case study. A methodological advantage of regression-kriging, compared to splines, is the possibility to automate the data processing and incorporate multiple auxiliary predictors. The remaining open issues are computational efficiency, application of local regression-kriging algorithms and preparation of suitable auxiliary data layers for such analyses.",
journal = "Computers & Geosciences",
title = "Geostatistical modeling of topography using auxiliary maps",
pages = "1899-1886",
number = "12",
volume = "34",
doi = "10.1016/j.cageo.2008.01.005"
}

Hengl, T., Bajat, B., Blagojević, D.,& Reuter, H. I.. (2008). Geostatistical modeling of topography using auxiliary maps. in Computers & Geosciences, 34(12), 1886-1899.
https://doi.org/10.1016/j.cageo.2008.01.005

Hengl T, Bajat B, Blagojević D, Reuter HI. Geostatistical modeling of topography using auxiliary maps. in Computers & Geosciences. 2008;34(12):1886-1899.
doi:10.1016/j.cageo.2008.01.005 .

Hengl, Tomislav, Bajat, Branislav, Blagojević, Dragan, Reuter, Hannes I., "Geostatistical modeling of topography using auxiliary maps" in Computers & Geosciences, 34, no. 12 (2008):1886-1899,
https://doi.org/10.1016/j.cageo.2008.01.005 . .

TY  - JOUR
AU  - Bajat, Branislav
AU  - Blagojević, Dragan
PY  - 2007
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/163
AB  - During the last decade, the development of computational technique has influenced wider implementation of numerical methods in different software applications, which are oriented to processing, presentation, and analysis of spatial data. This is particularly the case for geostatistical methods, which were developed for analysis of the data, which include spatial components. Those methods provide analytical processing and description of spatial continuity, which is an important characteristic for numerous natural phenomena. Implementation of classical statistical methods does not allow the perception of spatial distribution of natural phenomena. The development GIS (Geographical Information Systems) applications, especially geostatistical modules, enabled a lot of users dealing with spatial modeling and analysis to apply them in their work.
AB  - Nagli razvoj kompjuterske tehnike u toku poslednje decenije uticao je i na sve veću primenu numeričkih metoda u različitim softverskim aplikacijama koje su namenjene obradi, prezentaciji i analizi prostornih podataka. Ovo se posebno odnosi na geostatističke metode koje su razvijene za potrebe analize podataka koji u sebi sadrže prostornu komponentu. One nude mogućnost analitičke obrade i opisa prostornog kontinuiteta, što je važna karakteristika za mnoge pojave u prirodi. Primena klasičnih statističkih metoda ne omogućava nam da sagledamo u potpunosti prostorni raspored pojava koje se analiziraju. Razvoj GIS (Geografski Informacioni Sistemi) aplikacija i posebno specijalizovanih geostatističkih modula unutar njih, omogućio je velikom broju korisnika koji se bave analizom i modeliranjem prostora da koriste geostatističke metode u svom poslu.
PB  - Srpsko geografsko društvo, Beograd
T2  - Glasnik Srpskog geografskog društva
T1  - Application of geostatistics in spatial analyses
T1  - Primena geostatistike u prostornim analizama
EP  - 152
IS  - 2
SP  - 143
VL  - 87
DO  - 10.2298/GSGD0702143B
ER  - 

@article{
author = "Bajat, Branislav and Blagojević, Dragan",
year = "2007",
abstract = "During the last decade, the development of computational technique has influenced wider implementation of numerical methods in different software applications, which are oriented to processing, presentation, and analysis of spatial data. This is particularly the case for geostatistical methods, which were developed for analysis of the data, which include spatial components. Those methods provide analytical processing and description of spatial continuity, which is an important characteristic for numerous natural phenomena. Implementation of classical statistical methods does not allow the perception of spatial distribution of natural phenomena. The development GIS (Geographical Information Systems) applications, especially geostatistical modules, enabled a lot of users dealing with spatial modeling and analysis to apply them in their work., Nagli razvoj kompjuterske tehnike u toku poslednje decenije uticao je i na sve veću primenu numeričkih metoda u različitim softverskim aplikacijama koje su namenjene obradi, prezentaciji i analizi prostornih podataka. Ovo se posebno odnosi na geostatističke metode koje su razvijene za potrebe analize podataka koji u sebi sadrže prostornu komponentu. One nude mogućnost analitičke obrade i opisa prostornog kontinuiteta, što je važna karakteristika za mnoge pojave u prirodi. Primena klasičnih statističkih metoda ne omogućava nam da sagledamo u potpunosti prostorni raspored pojava koje se analiziraju. Razvoj GIS (Geografski Informacioni Sistemi) aplikacija i posebno specijalizovanih geostatističkih modula unutar njih, omogućio je velikom broju korisnika koji se bave analizom i modeliranjem prostora da koriste geostatističke metode u svom poslu.",
publisher = "Srpsko geografsko društvo, Beograd",
journal = "Glasnik Srpskog geografskog društva",
title = "Application of geostatistics in spatial analyses, Primena geostatistike u prostornim analizama",
pages = "152-143",
number = "2",
volume = "87",
doi = "10.2298/GSGD0702143B"
}

Bajat, B.,& Blagojević, D.. (2007). Application of geostatistics in spatial analyses. in Glasnik Srpskog geografskog društva
Srpsko geografsko društvo, Beograd., 87(2), 143-152.
https://doi.org/10.2298/GSGD0702143B

Bajat B, Blagojević D. Application of geostatistics in spatial analyses. in Glasnik Srpskog geografskog društva. 2007;87(2):143-152.
doi:10.2298/GSGD0702143B .

Bajat, Branislav, Blagojević, Dragan, "Application of geostatistics in spatial analyses" in Glasnik Srpskog geografskog društva, 87, no. 2 (2007):143-152,
https://doi.org/10.2298/GSGD0702143B . .

TY  - JOUR
AU  - Blagojević, Dragan
AU  - Bajat, Branislav
PY  - 2007
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/174
PB  - Republički geodetski zavod Srbije, Beograd
T2  - Geodetska služba
T1  - Gerard B. M. Heuvelink, Prenos grešaka kod GIS modeliranja životne sredine, Građevinski fakultet, Beograd, 2007
EP  - 50
IS  - 107-108
SP  - 50
VL  - 36
UR  - https://hdl.handle.net/21.15107/rcub_grafar_174
ER  - 

@article{
author = "Blagojević, Dragan and Bajat, Branislav",
year = "2007",
publisher = "Republički geodetski zavod Srbije, Beograd",
journal = "Geodetska služba",
title = "Gerard B. M. Heuvelink, Prenos grešaka kod GIS modeliranja životne sredine, Građevinski fakultet, Beograd, 2007",
pages = "50-50",
number = "107-108",
volume = "36",
url = "https://hdl.handle.net/21.15107/rcub_grafar_174"
}

Blagojević, D.,& Bajat, B.. (2007). Gerard B. M. Heuvelink, Prenos grešaka kod GIS modeliranja životne sredine, Građevinski fakultet, Beograd, 2007. in Geodetska služba
Republički geodetski zavod Srbije, Beograd., 36(107-108), 50-50.
https://hdl.handle.net/21.15107/rcub_grafar_174

Blagojević D, Bajat B. Gerard B. M. Heuvelink, Prenos grešaka kod GIS modeliranja životne sredine, Građevinski fakultet, Beograd, 2007. in Geodetska služba. 2007;36(107-108):50-50.
https://hdl.handle.net/21.15107/rcub_grafar_174 .

Blagojević, Dragan, Bajat, Branislav, "Gerard B. M. Heuvelink, Prenos grešaka kod GIS modeliranja životne sredine, Građevinski fakultet, Beograd, 2007" in Geodetska služba, 36, no. 107-108 (2007):50-50,
https://hdl.handle.net/21.15107/rcub_grafar_174 .