[GRASS-user] r.param.scale Question

GRASS GRASS user
1

   I've run r.param.scale multiple times to extract the various terrain
parameters from both 10m and 25m elevation maps. I set the region (and
resolution) to that of the input elevation map. All maps but the tangential
(planar) curvature map are properly rendered. This one comes out a solid
color. I don't see what I'm doing incorrectly on this one map.

   Suggestions appreciated.

Rich

2

I've run r.param.scale multiple times to extract the various terrain
parameters from both 10m and 25m elevation maps. I set the region (and
resolution) to that of the input elevation map. All maps but the

tangential

(planar) curvature map are properly rendered. This one comes out a

solid

color. I don't see what I'm doing incorrectly on this one map.

  Suggestions appreciated.

Rich

It's possible there are outliers in your raster map that are skewing the
color table; what is the result of r.info -r? Check to see the range of
the raster makes sense.

--
Eric

3

Eric wrote:

It's possible there are outliers in your raster map that
are skewing the color table;

whenever that is the case 'r.colors -e' can help.

Hamish

4

On Mon, 1 Mar 2010, Patton, Eric wrote:

It's possible there are outliers in your raster map that are skewing the
color table; what is the result of r.info -r? Check to see the range of
the raster makes sense.

Eric,

   That's not the situation here: no outliers. I successfully ran this at 5
and 10m resolutions, and once at 25m resolution. The region was incorrect in
this last case and after properly setting the region I could no longer
produce the multicolored map I did before.

   I'm not using that map since I _must_ get this report done and found a
different module (r.resamp.rst) that also generates tangential curves.

Thanks,

Rich