Le Hung wrote:
Now I'm researching How to use Grass GIS for image interpretation (Spot5
image) to create forest status map ( (1) run segmentation to create plot;
(2) select sample; (3) classification).
you can find a lot of tutorial information on the GRASS wiki, here is a
good place to start:
http://grasswiki.osgeo.org/wiki/Image_classification
I think you can also find some valuable information in the GRASS book
by Neteler and Mitasova (3rd ed.).
Hamish