TY  - JOUR
AU  - Borisov, Mirko
AU  - Vrtunski, Milan
AU  - Petrović, Vladimir
AU  - Bojović, Bogdan
AU  - Novak, Tanja
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7412
AB  - The paper analyzes the approximation of the ellipsoid by the sphere. Earth is a space body with a mathematically irregular shape, so idealized smooth surfaces are used for calculations. The first is the geoid, a smooth, equipotential surface that best approximates mean sea level. However, the geoid does not have an analytical form and is unsuitable for many applications, so an ellipsoid is used for approximation. In applications where high accuracy is not required (e.g., with small scale maps), the ellipsoid is approximated by a sphere. The radius of the sphere can be calculated in three ways: according to the equivalent volume criterion, according to the equivalent surface criterion, or as the mean value of the three semi-axes of the ellipsoid. All three methods of approximation were tested by calculating the length of the geodetic line on the ellipsoid, the orthodrome on the spheres and then the error. Also, the influence of latitude on the error value was tested. For three different values of geographic latitude, the lengths of geodetic lines up to one hundred points were calculated (using the Bessel method for solving the second main geodetic task on the ellipsoid), as well as the lengths of the orthodromes on the spheres, with the radii of the spheres determined in the three mentioned ways. The obtained results were then analyzed and discussed.
PB  - Subotica, Srbija: Građevinski fakultet Univerziteta Novi Sad
T2  - Journal of Faculty of Civil Engineering
T1  - Comparative analysis of the ellipsoid approximation with the sphere
VL  - 39
IS  - 44
SP  - 89
EP  - 105
DO  - 10.14415/JFCE-900
ER  - 

@article{
author = "Borisov, Mirko and Vrtunski, Milan and Petrović, Vladimir and Bojović, Bogdan and Novak, Tanja",
year = "2023",
abstract = "The paper analyzes the approximation of the ellipsoid by the sphere. Earth is a space body with a mathematically irregular shape, so idealized smooth surfaces are used for calculations. The first is the geoid, a smooth, equipotential surface that best approximates mean sea level. However, the geoid does not have an analytical form and is unsuitable for many applications, so an ellipsoid is used for approximation. In applications where high accuracy is not required (e.g., with small scale maps), the ellipsoid is approximated by a sphere. The radius of the sphere can be calculated in three ways: according to the equivalent volume criterion, according to the equivalent surface criterion, or as the mean value of the three semi-axes of the ellipsoid. All three methods of approximation were tested by calculating the length of the geodetic line on the ellipsoid, the orthodrome on the spheres and then the error. Also, the influence of latitude on the error value was tested. For three different values of geographic latitude, the lengths of geodetic lines up to one hundred points were calculated (using the Bessel method for solving the second main geodetic task on the ellipsoid), as well as the lengths of the orthodromes on the spheres, with the radii of the spheres determined in the three mentioned ways. The obtained results were then analyzed and discussed.",
publisher = "Subotica, Srbija: Građevinski fakultet Univerziteta Novi Sad",
journal = "Journal of Faculty of Civil Engineering",
title = "Comparative analysis of the ellipsoid approximation with the sphere",
volume = "39",
number = "44",
pages = "89-105",
doi = "10.14415/JFCE-900"
}

Borisov, M., Vrtunski, M., Petrović, V., Bojović, B.,& Novak, T.. (2023). Comparative analysis of the ellipsoid approximation with the sphere. in Journal of Faculty of Civil Engineering
Subotica, Srbija: Građevinski fakultet Univerziteta Novi Sad., 39(44), 89-105.
https://doi.org/10.14415/JFCE-900

Borisov M, Vrtunski M, Petrović V, Bojović B, Novak T. Comparative analysis of the ellipsoid approximation with the sphere. in Journal of Faculty of Civil Engineering. 2023;39(44):89-105.
doi:10.14415/JFCE-900 .

Borisov, Mirko, Vrtunski, Milan, Petrović, Vladimir, Bojović, Bogdan, Novak, Tanja, "Comparative analysis of the ellipsoid approximation with the sphere" in Journal of Faculty of Civil Engineering, 39, no. 44 (2023):89-105,
https://doi.org/10.14415/JFCE-900 . .

TY  - JOUR
AU  - Borisov, Mirko
AU  - Pal, Andrej
AU  - Vrtunski, Milan
AU  - Jovanović, Dušan
AU  - Petrović, Vladimir M.
AU  - Vulić, Milivoj
PY  - 2019
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3929
AB  - In this paper several well-known filtering techniques were compared in the purpose of automatic line generalization. The used methods for line simplification are digital first order low-pass filter, Savitzky-Golay (SG) filter and Whittaker filter. Two versions of the algorithm for line feature generalization were tested, from source scale 1:25 000 towards target scale of 1:100 000 and from source scale 1:25 000 towards scale of 1:50 000. Also, GPS data filtering for the target scale 1:50 000 was tested. The first version of the algorithm considers that there are no control data, and the filtering parameter is dictated by the desired accuracy for the target scale. The second version involves control data in the target scale. This means that the optimal value for the filtering parameter is the value for which the difference between input and control data is the smallest. Analysis showed that the SG filter yielded the best results in general. The proposed filters can be considered as a new solution for automated cartographic line simplification.
PB  - Croatia : Faculty of Mechanical Engineering in Slavonski Brod
PB  - Croatia : Faculty of Electrical Engineering in Osijek
PB  - Croatia : Faculty of Civil Engineering in Osijek
T2  - Tehnički Vjesnik
T1  - Preliminary Analysis of Quality of Contour Lines Using Smoothing Algorithms
VL  - 26
IS  - 5
DO  - 10.17559/TV-20180827150721
ER  - 

@article{
author = "Borisov, Mirko and Pal, Andrej and Vrtunski, Milan and Jovanović, Dušan and Petrović, Vladimir M. and Vulić, Milivoj",
year = "2019",
abstract = "In this paper several well-known filtering techniques were compared in the purpose of automatic line generalization. The used methods for line simplification are digital first order low-pass filter, Savitzky-Golay (SG) filter and Whittaker filter. Two versions of the algorithm for line feature generalization were tested, from source scale 1:25 000 towards target scale of 1:100 000 and from source scale 1:25 000 towards scale of 1:50 000. Also, GPS data filtering for the target scale 1:50 000 was tested. The first version of the algorithm considers that there are no control data, and the filtering parameter is dictated by the desired accuracy for the target scale. The second version involves control data in the target scale. This means that the optimal value for the filtering parameter is the value for which the difference between input and control data is the smallest. Analysis showed that the SG filter yielded the best results in general. The proposed filters can be considered as a new solution for automated cartographic line simplification.",
publisher = "Croatia : Faculty of Mechanical Engineering in Slavonski Brod, Croatia : Faculty of Electrical Engineering in Osijek, Croatia : Faculty of Civil Engineering in Osijek",
journal = "Tehnički Vjesnik",
title = "Preliminary Analysis of Quality of Contour Lines Using Smoothing Algorithms",
volume = "26",
number = "5",
doi = "10.17559/TV-20180827150721"
}

Borisov, M., Pal, A., Vrtunski, M., Jovanović, D., Petrović, V. M.,& Vulić, M.. (2019). Preliminary Analysis of Quality of Contour Lines Using Smoothing Algorithms. in Tehnički Vjesnik
Croatia : Faculty of Mechanical Engineering in Slavonski Brod., 26(5).
https://doi.org/10.17559/TV-20180827150721

Borisov M, Pal A, Vrtunski M, Jovanović D, Petrović VM, Vulić M. Preliminary Analysis of Quality of Contour Lines Using Smoothing Algorithms. in Tehnički Vjesnik. 2019;26(5).
doi:10.17559/TV-20180827150721 .

Borisov, Mirko, Pal, Andrej, Vrtunski, Milan, Jovanović, Dušan, Petrović, Vladimir M., Vulić, Milivoj, "Preliminary Analysis of Quality of Contour Lines Using Smoothing Algorithms" in Tehnički Vjesnik, 26, no. 5 (2019),
https://doi.org/10.17559/TV-20180827150721 . .