cat and size

[Lars Schylberg]

> What's the appropriate way to get a category
> and its corresponding size of area from
> a raster layer?

r.clump input=cat.map output=clump.map
r.stats -c fs== in=clump.map | r.reclass in=clump.map out=area.map

This will give the area sizes in pixels.

r.cats could pick up the category label if want that.

If you want to examine this in an interactive way use r.what.rast with the
cat.map and the area.map

Lars

Lars Schylberg                          Email: larss at fmi.kth.se  
Dept. of Geodesy and Photogrammetry 
Royal Institute of Technology (KTH)     Tel.   +46 8 790 86 33   
S-100 44  STOCKHOLM, SWEDEN             Fax.   +46 8 790 66 10