How can I combine vector & Raster onto DEM? (fwd)

[rado]

Hello Philip,
You can transform your vector layer into the raster one. After that
you should use r.reclass to assign some big values to your new
raster layer. Then you can use r.mapcalc to produce another raster layer
(geology + roads; use "+" operator). 
Using r.reclass you can easily assign new values for "roads" to
distinguish them from geology areas. Result is a new raster map you can
overlay over your DEM. Since 3D tools in GRASS don't provide extensive
query options, this hybrid raster should gives you what you expect. 
If you want to assign proper road width, use r.buffer, before combining
the geology and roads in r.mapcalc

Regards,

	-Rado Bonk 

Rado Bonk
Dept. of Geography and Geology
UNO, Nebraska, 68182-0199,
rado at cosmos.unomaha.edu

On Mon, 21 Feb 2000, Philip Warner wrote:

> What I want to do is combine the raster and vector (geology and roads),
> then put the resulting map over the DEM to get a combined 3d view.
> 
> I can put a raster map over a DEM, and I can put a vector map over a DEM,
> but I don't seem to be able to do both.
> 
> I have looked in the mailing list and in two of the tutorials, but with no
> luck. If someone can point me to a description of how to do this, or tell
> me how I can do this, that would be great.
> 
> Thanks,
> 
> Philip Warner.
> 
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