2016-09-16 0:14 GMT-05:00 Eddison Araya <eddisonj...@gmail.com>:
> El 15/9/2016 9:00 a. m., "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
>>
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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

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
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