I use DEM essentially to create surfaces on AutoCAD Civil 3D and then to create terrain profile views. I have been using mainly ASTER imagery from which I extract 2m contour lines in QGis and then create the mentioned surfaces. Since I need more accurate data I downloaded the free samples from WorldDEM (12m resolution) for South Africa, which I am now comparing with the exact same data from ASTER. The results are exactly the same, the terrain profiles are a perfect match, is this possible? Shouldn't the WorldDEM data be more accurate?
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