Assessing the Accuracy of DEMs Derived from Contour Line Maps and Comparing with ASTER DEMs

DEM accuracy properties including grid size could however vary from source to source for an area of interest.The sensitivity of principal topographic derivatives used in hydrologic modeling to DEM resolution, however has been systematically explored in few studies.A medium and large scale topographic map is one source of digital elevation models in many countries. In Iran GIS users digitize the1:50000scale maps to constructing of DEMs with10×10meters resolution.However these data are used for scientific analysis but the accuracy and quality of them is not completely known.Therefore in this paper we first examined the accuracy of a DEM derived from topographic maps and then investigated its quality by comparison the results with results derived from an ASTER DEM.