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

[Helmut Kudrnovsky]

hi devs,

I've added a script [1] with following calculations ideas:

- do some calculations with r.slope.aspect output
- coarse the resolution (but meet the DEM extent)
- do some calculations with r.slope.aspect output at the coarser resolution
- coarse the resolution again  (but meet the DEM extent)
- do some calculations with r.slope.aspect output at the again coarser
resolution
- combine all the results for some index calculation

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?

[1]
http://trac.osgeo.org/grass/browser/grass-addons/grass7/raster/r.valley.bottom/r.valley.bottom.py



-----
best regards
Helmut
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