[GRASSLIST:6482] Re: plot points in different color

Jose Gomez-Dans jgomezdans at gmail.com
Fri Apr 15 08:13:01 EDT 2005

On 4/15/05, Hamish <hamish_nospam at yahoo.com> wrote:
> > > I have a point data associated with PostgreSQL table. I would like
> > > to fill the points with RGB color based on their attribute (typical
> > > desktop GIS task).
> I think currently you have to use a shell script:
> d.vect cats= fcolor=
> for each category.
> you could use db.select as a source to feed these values in automatically.

   Presumably, to do this based on attribute, one would need to
classify the points  first in classes?

> > I wanted to achieve the something similar, but couldn't work out how
> > to do it. My aim was to have the points coloured according to some
> > attribute value (be it elevation, or something else), using a palette.
> > I couldn't suss out how to do it, so I ended up using GMT.
> > 
> > Now I want to do the same with nviz: I wans to plot some tracks on my
> > raster with some attribute coded as colour, but I think there's no way
> > of doing this (I can set a single colour for a points vector set, not
> > a palette).
> > 
> > So rather than answering your question :), I add to it: is it possible
> > to do this?
> the following things need to happen:
>  a) d.vect gets support for GRASSRGB column -> fill color for points
>  b) NVIZ would need support for vector areas
>  c) NVIZ would need support for vector area/points fill color
> Feel free to add these to the GRASS wish list if they are not already
> in there, or try your hand at coding them yourself.

OK, I have achieved this with GMT (grdview + psxyz, if anyone is
interested), but nviz would be great.

Thanks for the help

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