[GRASS-user] r.slope.aspect: Unexpected Results

Glynn Clements glynn at gclements.plus.com
Tue Jan 26 17:51:27 EST 2010

Rich Shepard wrote:

>    The source originally-imported DEM produces appropriate slope and aspect
> maps. The sub-region I cut out with v.in.region (I believe that's the module
> I used) doesn't calculate properly. Therefore, the problem is with the
> sub-map.

It's possible that the cropping may have changed the grid slightly.

What are the grid parameters (bounds, resolution, rows/cols) for the
source map and the cropped version?

You could try repeating the cropping process, using g.region's align=
option to align the grid to the source map.

Glynn Clements <glynn at gclements.plus.com>

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