[GRASS-user] r.watershed & massive dataset

[ivan marchesini]

Dear friends,
I'm trying to use r.watershed to obtain dainage and stream map of a very
large dem..
The region containing the dem is of around 260.000.000 of cells but
masking out null cells (with a raster MASK) the number of residuals dem
cells is of around 140.000.000.
I have tried without the -m flag but the process stops after few minutes
due to memory allocation problems (the computer has only 2 GB of RAM). 
Now I have started the process with the -m flag....

Do you have any suggestion to optimize the process?

thanks 

Ivan



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Ivan Marchesini
Department of Civil and Environmental Engineering
University of Perugia
Via G. Duranti 93/a 
06125
Perugia (Italy)
Socio fondatore GFOSS "Geospatial Free and Open Source Software" http://www.gfoss.it
e-mail: marchesini at unipg.it
        ivan.marchesini at gmail.com
tel: +39(0)755853760
fax (university): +39(0)755853756
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