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

[Rich Shepard]

On Tue, 26 Jan 2010, Glynn Clements wrote:

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

Glynn,

   I do hope it's something simple. I can't do more until I have a good DEM
map for the project area.

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

Source map (demNW raster map):

GRASS 6.4.0svn (Oregon):/usr4/grassbase > g.region rast=demNW -p
projection: 99 (Lambert Conformal Conic)
zone:       0
datum:      nad83
ellipsoid:  grs80
north:      1735231.43724681
south:      1120657.1324816
west:       143667.18968253
east:       952979.22944945
nsres:      32.82281055
ewres:      32.82281055
rows:       18724
cols:       24657
cells:      461677668

   Resolution in feet.

Cropped map (abernethy vector boundary map):

GRASS 6.4.0svn (Oregon):/usr4/grassbase > g.region vect=abernethy -p
projection: 99 (Lambert Conformal Conic)
zone:       0
datum:      nad83
ellipsoid:  grs80
north:      1334419.25160578
south:      1279151.24118496
west:       769192.9282895
east:       819255.92362222
nsres:      4.99982001
ewres:      4.99979979
rows:       11054
cols:       10013
cells:      110683702

   Resolution in metres.

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

   I'll try this.

Thanks,

Rich