[GRASS-user] categories in raster map
stephanie.faroux at meteo.fr
Thu Feb 26 07:01:16 EST 2009
Moritz Lennert wrote:
> On 26/02/09 11:47, FAROUX STEPHANIE wrote:
>> 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).
Thank you. And how do you put labels on categories please?
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