[GRASSLIST:7666] Re: graduate color in NVIZ based on Postgres

[Michael Barton]

Peter,

You are correct, in that you can't use the values stored in a GRASSRGB
column to color points. I seem to remember that someone was working on
changing this. 

This is in part why I wrote the thematic mapper script. Using
d.vect.thematic, you CAN create a thematic point (or line or area) map with
the colors varying according to the (numeric) value of one of the attribute
fields. It's pretty flexible for making such color-themed maps.

Michael
______________________________
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ  85287-2402
USA

voice: 480-965-6262; fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton


> From: Peter Misovic <grass_konferencia at centrum.sk>
> Date: Wed, 20 Jul 2005 19:24:54 +0200
> To: <GRASSLIST at baylor.edu>
> Subject: [GRASSLIST:7641] Re: graduate color in NVIZ based on Postgres
> 
> 
> Hi Michael,
> I've tried this functionality as the first step (in GIS manager), but with
> no effect.  But, I've applied this functionallity on points theme. This
> should be a problem, hm. So, if I understand it well, there is no
> functionality for displaing and color-based classifing database point layer
> through GIS manager? Thank you for your time,
> 
> 
> Peter
> 
> -----Original Message-----
> From: owner-GRASSLIST at baylor.edu [mailto:owner-GRASSLIST at baylor.edu] On
> Behalf Of Michael Barton
> Sent: Wednesday, July 20, 2005 9:31 AM
> To: Ing.Peter Misovic; GRASSLIST at baylor.edu
> Subject: [GRASSLIST:7633] Re: graduate color in NVIZ based on Postgres
> 
> Peter,
> 
> In d.vect (also in GIS Manager), one of the options is to draw a map with
> areas colored by the value of the GRASSRGB column.
> 
> Currently, this only works for fills of areas. Hopefully it will also work
> for points and lines/boundaries soon.
> 
> Michael
> 
> 
> On 7/19/05 12:27 PM, "Ing.Peter Misovic" <peter.misovic at gmail.com> wrote:
> 
>> Hi everybody,
>> d.vect.thematic script creted a colum in database named grassrgb
>> (which is a varchar column containing RRR:GGG:BBB values). Now, we
>> would like display this layer in NVIZ. Thematic classification should
>> be based on grassrgb colum. Is it possible to do that ?
>> 
>> Thank you,
>> Peter Misovic
>> Peter Sasvari
> 
> ____________________
> C. Michael Barton, Professor of Anthropology
> School of Human Evolution and Social Change
> PO Box 872402
> Arizona State University
> Tempe, AZ  85287-2402
> USA
> 
> Phone: 480-965-6262
> Fax: 480-965-7671
> www: <www.public.asu.edu/~cmbarton>
> 
> 
> 
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