[GRASS-user] can the grass calculate the area of different color for a image(tiff or other?)

[maven apache]

2009/6/18 Moritz Lennert <mlennert at club.worldonline.be>

> On 18/06/09 14:31, maven apache wrote:
> >         Also I found that I can see only five color from the tiff
> >         swi.tiff, and yesterday I get five category with the same
> >         steps(import and composite then calculate ), they are
> >         "0
> >         9321 26425 31744 32736   ";, but today it change to six!!
> >
> > Maybe I  remembered it wrongly. (*^__^*)
> >
> >
> >         And acturlly I want to extract each color and export them to a
> >         vector map, I am looking the proper commond.
> >
> > It seems that there is no corresponding command to  achieve this goal£¿
>
>
> Please start by reading:
>
> http://grass.osgeo.org/grass64/manuals/html64_user/rasterintro.html
> http://grass.osgeo.org/grass64/manuals/html64_user/vectorintro.html
>
> The command you are looking for is r.to.vect (I see it is not mentioned
> in the rasterintro. Should be...).

It seems that the r.to.vect is to transfer the hole raster map to a
vector,but I want to transfer each category to a vector....

>
>
> Moritz
>
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