[GRASS-user] Digitization on 3-D

[Michael Barton]

Carlos,

You cannot digitized with NVIZ. But you CAN do what you seem to need to do.

Use r.shaded.relief (menu: Raster>Terrain analysis>shaded relief) to create
a relief map of the area you want to digitize

Use r.his (menu: Raster>Manage map colors>HIS to RGB) to created the R,G,B
channels for a color draped relief map. Use the color map you want to drape
for the hue chanel and the shaded relief map for the intensity channel.

Combine the output of r.his with r.composite (menu: Raster>Manage map
colors>Create RGB) into a final color shaded map.

Use this map as the background map with v.digit (you can have this as an
active layer in the layer manager and it will come up automatically as a
background map when you start digitizing from the GUI.)

Michael


On 7/2/07 6:52 AM, "Carlos "Guâno" Grohmann" <carlos.grohmann at gmail.com>
wrote:

> I don't think you can digitize on NIVIZ, but you can use v.drape to
> assign the elevation of a DEM to the vertices of lines/poligons
> 
> Carlos
> 
> 
> 
> On 7/2/07, Massimiliano Cannata <massimiliano.cannata at supsi.ch> wrote:
>> Hi Ravi,
>> was it a question or a sentence?
>> 
>> As i know you can get end redirect on a file the coords of the clicked
>> points, but i don't know any tool to digitalize trough NVIZ.
>> 
>> As I'm really interested in such a tool, please update me if you know more.
>> 
>> Thanks,
>> Maxi
>> 
>> RAVI KUMAR wrote:
>>> Hi All,
>>> Is it possible to actually digitize through NVIZ.
>>> 
>>>    Like to drape an imagery on SRTM surface for the
>>> same clip, and digitize. Such that I can close
>>> polygons based on the topagraphy shown through the
>>> SRTM surface.
>>> 
>>> Cheers
>>> Ravi Kumar
>>> 
>>> 
>>> 
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__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics and Complexity
Arizona State University

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