Re: [GRASS-user] DEM to DTM

2016-09-16 Thread Laurent C.
2016-09-16 0:14 GMT-05:00 Eddison Araya : > El 15/9/2016 9:00 a. m., "José Anderson" > 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

Re: [GRASS-user] DEM to DTM

2016-09-15 Thread Laurent C.
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

Re: [GRASS-user] DEM to DTM

2016-09-15 Thread Eddison Araya
El 15/9/2016 9:00 a. m., "José Anderson" 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