Reliability of Data obtained by ASTER Satellite for Digital Elevation Models

Abstract

The Digital Elevation Model (DEM) is a typical type of topographic data. Data on elevation are often used as a major information source for analysis and modeling by geographic information systems. Modern continuous changes across space are represented by DEM. Particularly, the European Union Digital Elevation Model (EU-DEM), a new dataset derived from the EU's Copernicus Land Monitoring Service, which features contours developed for all DEMs which are compared with the contours of a topographic map. One of the most important sources of topographical information is the Advanced Spaceborne Thermal Emission and Reflection Radiometer Global Digital Elevation Model (ASTER GDEM). Compared to data from the Ground Control Points (GCPs), the vertical differences in ASTER products are utilized to calculate the Root Mean Squared Error (RMSE). The vertical accuracy of this DEM is assessed to be 13.13 m, which is the RMSE that was determined based on the data collected in the field by GNSS. In addition, the Standard Deviation (SDT) error came in at 2.60 m. After considering the effect of correcting bias, the error findings may range from a minimum of-6.47 m to a maximum of 1.998 m. Variations in RMSE and SDT are less than 0.991 m and 0.960 m, respectively.