hi Salah,
about your first question on the use of GRASS to model forest fires
here is a citation yu shuold check out. it involves the mapping of the
output of the BEHAVE fire spread model in GRASS using a two step process.
Xu, J. and R.G. Lathport Jr. 1993. Geographic information system (GIS) based
wildfire spread simulation. Proceedings 12th Conference on Fire and Forest
Meterology. Jekyll Island, GA.
the proceedings may have some more information, and this particular paper is
a good start.
good luck, and please let me know how your project is doing
rica
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