Open AccessVertical Accuracy Assessment of Open Access Digital Elevation Models Using GPS
Author(s) -
Dilbarkhon Fazilova,
Khasan Magdiev,
Lola Sichugova
Publication year - 2021
Publication title -
international journal of geoinformatics
Language(s) - English
Resource type - Journals
ISSN - 2673-0014
DOI - 10.52939/ijg.v17i1.1701
Subject(s) - advanced spaceborne thermal emission and reflection radiometer , digital elevation model , geoid , shuttle radar topography mission , geology , geodesy , geodetic datum , global positioning system , remote sensing , elevation (ballistics) , polygon (computer graphics) , geophysics , computer science , geometry , telecommunications , mathematics , frame (networking) , measured depth
In this study, the vertical accuracy of the Shuttle Radar Topography Mission Digital Elevation Model Version 2.0 (SRTM30), the Advanced Spaceborne Thermal Emission and Reflection Radiometer Global DEM Version 2.0 (ASTER GDEM2), and Advanced Land Observing Satellite World 3D Digital Surface Model Version 2.1 (ALOS AW3D30) was statistically assessed using GPS data. The Tashkent geodynamical polygon was chosen as a study region, where the land surface can reflect as both natural (tectonic) and man-made (Charvak reservoir load effect) processes. The geometric approach using GPS/leveling stations and EGM96 GGM-based geoid undulations was applied for local geoid modeling. RMSE of ~7.48 m, ~6.90 m, and ~8.24 m was obtained for SRTM30, ASTER GDEM2, and ALOS AW3D30, respectively. ASTER GDEM2 proved to be the most accurate DEM with absolute vertical accuracy LE90 of 11.35 m and ME of 5.25 m and it is very suitable for geodetic and hydrological studies in this mountainous area.