How to create a DEM starting from layers shapefile "contour lines" and "shares"?
Which module of GRASS do I need to use?
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In the GRASS GIS Wiki, there is a dedicated page for this: http://grass.osgeo.org/wiki/Contour_lines_to_DEM The page demonstrates and compares a number of different methods of converting vector contour lines into raster DEM surfaces including screenshots.