[GRASS-user] categories in raster map

[FAROUX STEPHANIE]

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?