Dear all, I extracted drainage from a large number of tiles of SRTM DEMs, for several regions of Brazil. The regions have very different relief conditions, ranging from almost flat to very inclined. I have some cartographic maps at scale 1:50,000, and the (reference) densities ranges from 7 to 16%. But I was surprise that using the command below the estimated drainage is (on my point of view) very homogeneous, ranging from 3 to 4% only:
r.watershed.exe -m --o memory=2048 elevation=srtm_map threshold=250 stream=srtm_map_drainage Why my output map is so homogeneous accross regions with very different terrain conditions? Any hint are welcome. cheers milton
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