Hello José, There is basically three global DEM freely available: - Aster DEM, which is agreed to be garbage - SRTM, which is the reference - the newly released ALOS DEM, which seems to be the best quality of all 3.
They are surface models, so trees and buildings are affecting the altitude values. It exists methods to approximate the bare earth, but neither easy nor accurate. Furthermore, the methods described in the literature seems more designed for global correction that might not lead to adequate results for detailed study in urban environment. I actually have the same problem as you and in search of solutions. Regards, Laurent El sept. 15, 2016 10:00 AM, "José Anderson" <joseandersonbati...@gmail.com> escribió: > Dear all, > > I'm in need to start a study in a urban area in which the DTM ( > https://en.wikipedia.org/wiki/Digital_elevation_model) is to be obtained > from a DEM (SRTM or ASTER). > > I've seen GRASS7 can provide DTM from LiDAR maps, but I'm afraid it won't > work in this case. > > So, how to derive a DTM from DEM in GRASS 7? > > Any answer would be appreciated. > > Jose > > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/grass-user >
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