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

[Markus Neteler]

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)?

Do you use these data in their original projection?

BTW:
you may use the new EU-DEM: Digital Surface Model at 25m

I made some screenshots at:
http://courses.neteler.org/eu-dem-new-digital-surface-model-at-25m/

and continue to use it for various applications:
http://courses.neteler.org/using-the-25m-eu-dem-for-shading-openstreetmap-layers/

(r.sun based analysis coming soon)

Markus