[GRASS-user] Experience with extracting a DTM from a DSM ?

[Moritz Lennert]

On 08/05/18 13:40, Markus Neteler wrote:
> Hi,
> 
> Moritz Lennert <mlennert at club.worldonline.be 
> <mailto:mlennert at club.worldonline.be>> schrieb am Di., 8. Mai 2018, 12:58:
> 
>     Hi,
> 
>     Does anyone have experience with extracting a DTM (ground) from a DSM ?
>     Any special GRASS modules I missed ? Any hints ?
> 
> 
> Do you mean from a raster DSM?

Yes, a raster DSM which is the output of photogrammetry. The resolution 
of the DSM is 25cm, so using the classic SRTM or ASTER GDEM DTM is not 
adequate. The ultimate goal is an nDSM, i.e. the height relative to 
ground of non-ground objects.

Moritz