[GRASS-user] DEM to DTM

GRASS GRASS user
1

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

2

El 15/9/2016 9:00 a. m., “José Anderson” <joseandersonbatista@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

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Hola!!

http://ssrebelious.blogspot.co.uk/2013/03/dsm-to-dem-conversion.html?m=1

Espero te funcione el link anterior

Saludos

Eddison

3

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” <joseandersonbatista@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

4

2016-09-16 0:14 GMT-05:00 Eddison Araya <eddisonjose@gmail.com>:

El 15/9/2016 9:00 a. m., "José Anderson" <joseandersonbatista@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

Hola!!

http://ssrebelious.blogspot.co.uk/2013/03/dsm-to-dem-conversion.html?m=1

Espero te funcione el link anterior

Saludos

Eddison

Hi,

Interesting, but in case of low-res DSM (30m for recent global DEM),
there is basically no bare-earth visible and the whole urban area
appears elevated. In case the city in question have wide avenues that
could be seen on the DSM you might have more luck.

Laurent