[GRASSLIST:9205] Re: Color shaded relief

Glynn Clements glynn at gclements.plus.com
Wed Nov 23 12:24:49 EST 2005


Jason Horn wrote:

> 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?

I don't see how the results produced by r.shaded.relief and d.his are
any worse than that example.

Have your elevation maps been subject to smoothing? A shaded relief
map will only look as crisp as the actual terrain.

-- 
Glynn Clements <glynn at gclements.plus.com>




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