[GRASS-user] Re: nviz - thematic mapping for vector points

Nikos Alexandris nikos.alexandris at felis.uni-freiburg.de
Fri Jul 31 11:28:30 EDT 2009

On Mon, 2009-07-27 at 21:42 +0200, Nikos Alexandris wrote:
> I have problem understanding nviz settings for 3d vector points (Vector
> Points Panel).
> I have some point data (converted to 3D vector) and columns x, y, z,
> annual (fp precipitation values), annual_int (integer precipitation
> values), etc.
> I want to get the spheres coloured based on z (elevation) and sized
> (=volume) based on the precipitation values upon the srtm3_dem. Hence, I
> use the "thematic mapping for vector points". No matter what I try, I
> don't it right.
> Color(s) - The colors do not correspond to the ones that the "Auto" &
> "Apply" is supposed to set. I get sometimes black spheres although there
> is no black color defined.
> Size - Some spheres just dissapear. But I checked the values from the
> column I use and I don't find that they so much different. And I though
> that setting the "icon size" is some kind of scaling.
> Is there anything special that I have to check? BTW, the documentation
> of nviz looks outdated (?). Below some code.

No matter what I do I can't get "scaled" coloring or (re-)sizing of 3d
points in nviz. I see a message in the console though (is it relevant?):

  "Dev note: Adapted sites library used for vector points. (module
should be updated to GRASS 6 vector library)"


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