[GRASSLIST:9192] Re: Color shaded relief

[Michael Barton]

A couple things to keep in mind. As Ian MacMillan, you can exercise a lot of
control over the color table of the draping map.

Also, there are several ways to control the creation of the shaded relief
map. Besides changing the altitude of the sun (lower makes more shadows and
accentuates relief), you can also change the z-exaggeration of the relief.
It is set by default to 1, but I often change it to 2 (double the apparent
relief).

Attached is a small jpeg example of what you can do.

Michael


__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ 85287-2402

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



> From: Jason Horn <jhorn at bu.edu>
> Date: Tue, 22 Nov 2005 16:59:58 -0500
> To: GRASS Users List <GRASSLIST at baylor.edu>
> Subject: [GRASSLIST:9189] Color shaded relief
> 
> Hi all,
> 
> I'm wondering if anyone out there has had experience creating
> attractive color shaded relief images from DEMs.  The basic procedure I
> have used is as follows:
> 
> 1) r.shaded.relief DEM azimuth=270 altitude=30
> 2) d.his h_map=DEM_shadei_map=DEM
> 
> This is the procedure suggested in Markus' book.  My problem is that
> I always end up with rather muddy-looking results.  I have tried all
> kinds of variations on this procedure, including different altitude
> settings, recoloring the hillshade with a contrast-enhancing
> greyscale color scheme before running r.his, etc.  No real
> improvement.  As an example of what I'm shooting for, have a look at
> this:
> 
> http://www.srh.noaa.gov/ridge/grk.shtml
> 
> Can anyone suggest a technique for achieving this quality?
> 
> 
> - Jason
> 
> 
> Jason Horn
> Boston University Department of Biology
> 5 Cumington Street  Boston, MA 02215
> 
> jhorn at bu.edu
> office: 617 353 6987
> cell: 401 588 2766

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