[GRASS-user] Is the SRTM dataset a DEM or a DSM?

[Massimiliano Cannata]

HI,
Well, in my opinion a DTM is a model describing the elevation of the 
terrain, without superimposed elements like houses, bridge, etc...
A DSM is a general term for a surface model of whatever type...
and a DEM is a model of elevations, where the Z is the height (including 
therefore DTM, but also DSM)

I most like DTM only for bare earth surface, and DSM for 
terrain+superimposed elements

And SRTM seems to be a DSM in this sense...


my 2 cents...
Maxi

Carlos "Guâno" Grohmann wrote:
> IMO its a DEM, since the "z" value represents elevation, including
> tree canopy and urban features. I personally don't like the term DSM
> because it can be related with any kind of Surface, and DEM (and DTM,
> when the "z" values represent the altitude) is related with the
> _topographical_ surface.
>
> cheers
>
> Carlos
>
>
>
>
> On Wed, Jun 25, 2008 at 15:31, Nikos Alexandris
> <nikos.alexandris at felis.uni-freiburg.de> wrote:
>   
>> In http://srtm.csi.cgiar.org/SRTMdataProcessingMethodology.asp it's
>> called only DEM. In some papers it's called DSM.
>>
>> I'd rather say it's a DSM. But I would also like to know if there are
>> objections ;-)
>>
>> Thank you,
>>
>> Nikos
>>
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>>
>>     
>
>
>
>   


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Dr. Massimiliano Cannata
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