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
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