[GRASS-user] Peak point extraction from DEM

[Michael Barton]

On 7/1/07 5:46 PM, "Amagine" <amagine at telus.net> wrote:

> Hello, I am trying to extract peak points from a digital elevation map.

(GUI menu: raster>terrain analysis>terrain parameters)

r.param.scale input=DEM output=feature.map param=feature

This will ID peaks, ridges, passes, channels, pits, and planes

> 
> I would like to be able to regulate the following parameters:
> 
> Minimum height of peak

A topographic "peak" will have an elevation, not a range of elevations. So
I'm not sure what you mean.

> Minimum drop of surrounding peaks

Not sure what you mean here too.

> Minimum radius from surrounding peaks

use r.distance or convert to vector and use v.distance

> summit points
> optional hierarchy...
> 

I guess these are technical mountaineering terms? So again I'm not sure what
data you are hoping to extract.

> Are there any tools in GRASS that may be able to do such an extraction?

Probably a way to get all this information in GRASS

Michael


> 
> Thank you.
> 
> Mars
> 
> 

__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton