[GRASS-user] Strange r.slope.aspect output of Aster dem : slope calculations

[manuel.martin]

Thanks for the replies, we actually derived SRTM DEMs and yes this thime 
without artifacts.

Cheers


On 01/08/2014 09:16 PM, Markus Metz wrote:
> On Fri, Dec 20, 2013 at 4:54 PM, manuel.martin
> <manuel.martin at orleans.inra.fr> wrote:
>> Hi all,
>> I just computed the slope using r.slope.aspect on the Aster data over the
>> full French territory, and as a result got large artefact stripes on a south
>> west-north east axe? When could it come from (inadequate re-projection, the
>> slope routine or the aster data)?
>>
>> The stripped result :
>> https://www.dropbox.com/s/fcxaei1be9wsmka/slopeFranceSmall.png
>> https://www.dropbox.com/s/b52k5co46ujmpt7/slopeFrance.jpg
> ASTER data are not really suitable to derive a DEM, your example is
> another demonstration that an ASTER-derived DEM contains artefacts.
> SRTM DEMs are without these artefacts.
>
> Markus M
>


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