[GRASS-user] Accentuating/adding topography to a raster image?

[Michael Barton]

This is also automatically done in the GUI. Just put your shaded relief map
into the basemap field and your image into the drape map field.

Display and presto, you have a topographically shaded image.

You can also do this in nviz for an even more dramatic effect. Use a DEM
(not shaded relief) as a basemap/elevation map and use your image as a color
map for the topography.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
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



> From: Jachym Cepicky <jachym.cepicky at centrum.cz>
> Date: Sat, 12 Aug 2006 12:27:33 +0200
> To: Jonathan Greenberg <jgreenberg at arc.nasa.gov>
> Cc: 'GRASS user list' <grassuser at grass.itc.it>
> Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?
> 
> Hi,
> 
> I use this approach:
> 
> d.his h=your_map i=aspect
> 
> or
> 
> d.his h=your_map i=r_shaded_relief
> 
> or run nviz and set the light source ;-)
> 
> jachym
> 
> 
> On Sat, Aug 12, 2006 at 02:45:22AM -0700, Jonathan Greenberg wrote:
>> We're trying to add in a bit of topographic shading/illumination into an
>> image, and I was hoping to get some feedback on what algorithms work the
>> best?  I tried a hillshade approach in ENVI, was pretty unimpressed with it.
>> Any suggestions for a GRASS approach?  Run r.sun and do some sort of pixel
>> weighting?
>> 
>> --j
>> 
>> --
>> 
>> Jonathan A. Greenberg, PhD
>> NASA Postdoctoral Researcher
>> NASA Ames Research Center
>> MS 242-4
>> Moffett Field, CA 94035-1000
>> Phone: 415-794-5043
>> AIM: jgrn3007
>> MSN: jgrn3007 at hotmail.com
>> 
>> 
>> 
>> _______________________________________________
>> grassuser mailing list
>> grassuser at grass.itc.it
>> http://grass.itc.it/mailman/listinfo/grassuser
> 
> -- 
> Jachym Cepicky
> e-mail: jachym.cepicky at centrum.cz
> URL: http://les-ejk.cz
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