[GRASSLIST:2812] Re: v.what.rast bug?
blazek at itc.it
Tue Mar 2 13:30:52 EST 2004
On Tuesday 02 March 2004 17:22, Christopher Fonnesbeck wrote:
> I have a raster layer of watershed sub-basins that have the sub-basin
> area as the raster value, and a stream layer into which I am trying
> upload the corresponding sub-basin area values. However, when I run
> "v.what.rast vect=streams rast=basins_area col=wsarea", the specified
> column in the vector attribute table is filled with zeros, rather than
> the areas. I have verified that the raster values are actually the
> sub-basin areas, using d.what.rast. Has anyone run into this problem,
> or know of an obvious solution?
Upload raster values at positions of vector points to the table.
_POINTS_, one line may intersect many cells with different raster values.
Do you want to get around r.to.vect problem? You can generate points
in the middle of lines using v.segment.
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