[GRASS-user] categories in raster map

[Nikos Alexandris]

On Thu, 2009-02-26 at 13:01 +0100, FAROUX STEPHANIE wrote:
> Moritz Lennert wrote:
> > On 26/02/09 11:47, FAROUX STEPHANIE wrote:
> >> Hello,
> >> I see the function r.cats which allows to read categories of a raster 
> >> map, but how can i define these attributes? Should i pass by a vector 
> >> map? In the database menu, it doesn't seem possible to add a table 
> >> for a raster map.
> >
> > Raster maps have categories and labels. Categories have to be 
> > numerical, labels can be anything. Each pixel needs to have a category 
> > value (or NULL) and optionally you can have one (and only one) label 
> > per category value.
> >
> > BTW, r.cats is now replaced by r.category.
> >
> > If you want to link a cell with many attributes, you will have to use 
> > vector grids (v.mkgrid or r.to.vect as you suggestà).
> >
> > Moritz
> >
> Thank you. And how do you put labels on categories please?

Dear Stephanie,

please have a look in the manual ( "g.manual r.category" ). The examples
are very helpful.

Kind regards, Nikos