[GRASSLIST:6346] Re: convert vector to raster

Carlos Henrique Grohmann guano at usp.br
Wed Apr 6 07:56:18 EDT 2005


Maciek,

in ps.map you can specify the RGB color you want for vector areas, but you will
have to make one entry in you script file for each color (check out ps.map man
page). for example, in a geologic map:

vareas geology
layer 1
masked y
where lithology='sandstone'
label Sandstone
color black
fcolor 215:93:63
width 0.1
end


You do this for each lithology (or soil type, in your case)


Hope this helps

Carlos


-- 
+----------------------------------------------------------+
          Carlos Henrique Grohmann - Guano  
   Geologist M.Sc - Doctorate Student at IGc-USP - Brazil
        Linux User #89721  - guano at usp dot br
+----------------------------------------------------------+


Citando Maciek Sieczka <werchowyna at epf.pl>:

> Hi
> 
> I've got a question regarding the opposite situation. When I convert a 
> colorfull integer raster (eg. landuse) to vector polygons, how can I 
> preserve colors in the resulting polygon vector layer, ie. copy raster's RGB
> 
> values to output's datatable GRASSRGB column?
> 
> Also, is it possible to assign colors to vector layer automaticaly in a 
> similar way that  r.colors does it for rasters? It's important for ps.map. 
> So far I've been converting my polygon vectors to raster, r.colors, and 
> ps.map then. How could I specify a colortable directly on a vector layer?
> 
> Maciek
> 
> ----- Original Message ----- 
> From: "Michael Barton" <michael.barton at asu.edu>
> To: "Carlos Henrique Grohmann" <guano at usp.br>; "GRASS mailing list" 
> <GRASSLIST at baylor.edu>
> Sent: Wednesday, April 06, 2005 7:24 AM
> Subject: [GRASSLIST:6343] Re: convert vector to raster
> 
> 
> > Carlos,
> >
> > You are almost there. Use the 'rules' option in r.colors to specify the
> > color you want for each value in your new raster map. Then you can do the
> > drape with the colors you want. For an ortho-view, create a shaded relief
> > map (under raster/terrain analysis in the menus). Then drape the colored
> > geology raster over it using d.his (display/display raster map in the
> > menus).
> >
> > Michael
> >
> >
> > On 4/5/05 2:29 PM, "Carlos Henrique Grohmann" <guano at usp.br> wrote:
> >
> >> Dears,
> >> I was trying to make a 3D dysplay of a DEM with geology over it, but NVIZ
> >> doesn't handle vector areas (color filed), so I figured out about convert
> 
> >> my
> >> vector geology to raster, but then I couldn't get the colors! I can set 
> >> up a
> >> single value, or a column in the table, but this col can't be GRASSRGB, 
> >> which
> >> I
> >> use to give me the right colors on screen.
> >> How can I get this 3D-geology?
> >>
> >> thanks all
> >>
> >> Carlos
> >
> > -- 
> > Michael Barton, Professor
> > School of Human Origins, Cultures, & Society
> > Arizona State University
> > Tempe, AZ  85287
> >
> > Web - http://www.public.asu.edu/~cmbarton
> >
> > 
> 
> 




More information about the grass-user mailing list