[GRASS-user] extract slope lower than 25 meters ?

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Good morning,I have to extract slope lower than 25 meters. But i'm working
with SRTM raster DEM 30 meters resolution...1/ Is there a tool with qgis in
order to extract slope values? 2/ According to you, is it possible to
extract 25 meters slope values with srtm 30 meters. if it is not the case,
do you know another way? Another DEM more acurate for instance? Thank you
very much.  



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