Accuracy of Extracted Elevations from Interpolated Digital Elevation Models

Abstract

Digital Elevation Model (DEM) is nowadays considered to be the most useful model that distributes the elevations of features reasonably easier than old methods. There are different methods for making a Digital Elevation Model; the first one is by collecting heights from field, from which a contour map is drawn but this is very difficult and takes more time on large area. It is easier and economical to extract the DEM from a digital image. A Digital Elevation Model (DEM) for the eastern part of Abudelik was taken from the Advance Space born Thermal Emission and Reflection Radiometer (ASTER) by its coordinates with 30m resolution. Geographic Information System (GIS) was used to extract the elevations of the grid from the (DEM) with varying point densities. The main conclusion reached is that accuracy of interpolated elevations depends on point’s distribution and location of each point within the grid.