[GRASS-user] negative categories?

[Achim Kisseler]

Hi,

from a raster map I get vector polygons with r.to.vect.
As I use the -v flag, I get one category-number for each value. This is
what I want.

My problem: v.to.db does not update negative cats! Is there any way to
handle this?

I dont want to loose the identification, nor miss the -v Flag: Having
raster-values in a column "value" is not clean, due to the fact, that I
have eg. to remove small trapped cells, calc center of gravity and more.

Thanks,
Achim