Accuracy Assessment, Comparative Performance, and Enhancement of Public Domain Digital Elevation Models (ASTER 30 m, SRTM 30 m, CARTOSAT 30 m, SRTM 90 m, MERIT 90 m, and TanDEM-X 90 m) Using DGPS

Publicly available Digital Elevation Models (DEM) derived from various space-based platforms (Satellite/Space Shuttle Endeavour) have had a tremendous impact on the quantification of landscape characteristics, and related processes products. The accuracy elevation data six major public domain satellite-derived (a 30 m grid size—ASTER GDEM version 3 (Ast30), SRTM (Srt30), CartoDEM V3R1 (Crt30)—and 90 size—SRTM 4.1 (Srt90), MERIT (MRT90), TanDEM-X (TDX90)), as well improvement in achieved by applying correction (linear fit) using Differential Global Positioning System (DGPS) estimates at Ground Control Points (GCPs) is examined detail. study area hard rock terrain that overall flat-like with undulating uneven surfaces (IIT (ISM) Campus its environs) where statistical analysis (corrected uncorrected DEMs), correlation statistics tests (for slope), resampling methods, optimum number GCPs for reduction error order to use it further applications been presented As application DGPS helps substantial bias removal systematic error, recommended DEMs may be corrected before being used any scientific studies.