[GRASS-user] can the grass calculate the area of different color
for a image(tiff or other?)
mlennert at club.worldonline.be
Thu Jun 18 09:24:15 EDT 2009
On 18/06/09 14:59, maven apache wrote:
> 2009/6/18 Moritz Lennert <mlennert at club.worldonline.be
> <mailto: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
> Please start by reading:
> 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....
The easiest solution is probably a combination of r.to.vect + v.extract.
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