[GRASS-user] Extraction 3D vectors ridges/Thalweg from raster DEM ?

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Hello,

Ok sorry i checked again the settings and this time i can read into my new
vector indeed 3 new colums. But unfortunatly, the values are NULL...;-(

<http://osgeo-org.1560.x6.nabble.com/file/n5094412/SS_errormessage.jpg> 



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