[GRASSLIST:6405] Relative slope position in GRASS?

GRASS GRASS user
1

Any hints/plugins available to calculate relative slope position with GRASS
6.0?

--j

--
Jonathan A. Greenberg, PhD
NRC Research Associate
NASA Ames Research Center
MS 242-4
Moffett Field, CA 94035-1000
650-604-5896
AIM: jgrn307
MSN: jgrn307@hotmail.com

2

Any hints/plugins available to calculate relative slope position with
GRASS 6.0?

I'm not 100% sure what "relative slope position" is, but r.slope.aspect
will calculate slope and aspect maps from an elevation map.

Then d.rast.arrow will show downhill flow direction from the aspect map
(need to zoom way in) or someone recently posted a way to do this in a
better way using the R-statistics interface.

Hamish

3

On Tue, Apr 12, 2005 at 01:45:42PM +1200, Hamish wrote:

> Any hints/plugins available to calculate relative slope position with
> GRASS 6.0?

I'm not 100% sure what "relative slope position" is, but r.slope.aspect
will calculate slope and aspect maps from an elevation map.

Then d.rast.arrow will show downhill flow direction from the aspect map
(need to zoom way in) or someone recently posted a way to do this in a
better way using the R-statistics interface.

The r.param.scale
http://grass.itc.it/grass60/manuals/html60_user/r.param.scale.html
can help as well.
"r.param.scale extracts terrain parameters from a DEM."

-> feature: Morphometric features: peaks, ridges, passes, channels, pits and planes

Markus