[GRASS-dev] r.slope.aspect: one pixel less in the output at the border shrinks region extent in further calculations

Pietro peter.zamb at gmail.com
Sun Jan 4 03:12:54 PST 2015

Dear Helmut,

On Sat, Jan 3, 2015 at 1:49 PM, Helmut Kudrnovsky <hellik at web.de> wrote:
> as the extent of the r.slope.aspect output is 1 pixel less then DEM input,
> the extent of the calculation output shrinks from one step to the next as
> the resolution is coarsening.
> any idea how to overcome such a shrinking?

r.slope.aspect compute the first derivative (1 pixel less) and depends
on the outputs that are selected the second derivative (2 pixels
less), this is not a bug.

Have a nice Sunday.


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