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

[Michael Barton]

DEFINITELY drop your resolution before running nviz (or even making a shaded
relief map) unless you want to take all night to display stuff. This will
have a much bigger effect than the size of the image per se.

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 20:12:48 +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?
> 
> what about resample your resolution?
> 
>     g.region res=*MORE*
> 
> result could be still printable, but it would not be so big
> 
> jachym
> 
> On Sat, Aug 12, 2006 at 11:00:28AM -0700, Jonathan Greenberg wrote:
>> My main problem is the dem and image are both about 1.5 gb each -- am I
>> likely to run into problems with this?
>> 
>> Never played with nviz before, looks like I'll be trying it out tonight!
>> 
>> --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
>> 
>> -----Original Message-----
>> From: Michael Barton [mailto:michael.barton at asu.edu]
>> Sent: Saturday, August 12, 2006 10:54 AM
>> To: Jachym Cepicky; Jonathan Greenberg
>> Cc: 'GRASS user list'
>> Subject: Re: [GRASS-user] Accentuating/adding topography to a raster image?
>> 
>> 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
>>> GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
>>> -----------------------------------------
>>> OFFICE:        
>>> GDF-Hannover
>>> Mengendamm 16d
>>> 30177 Hannover
>>> Germany
>>> e-mail: cepicky at gdf-hannover.de
>>> URL:    http://gdf-hannover.de
>>> Tel.:   +49 511-39088507
>> 
>> 
>> _______________________________________________
>> grassuser mailing list
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> 
> -- 
> Jachym Cepicky
> e-mail: jachym.cepicky at centrum.cz
> URL: http://les-ejk.cz
> GPG: http://les-ejk.cz/gnupg_public_key/jachym_cepicky-gpg_public_key.asc
> -----------------------------------------
> OFFICE:          
> GDF-Hannover
> Mengendamm 16d
> 30177 Hannover
> Germany
> e-mail: cepicky at gdf-hannover.de
> URL:    http://gdf-hannover.de
> Tel.:   +49 511-39088507