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How to create a DEM starting from layers shapefile "contour lines" and "shares"?

which module of GRASS I need to use?

thanks for yours responses....

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I would possibly know the steps to follow. – Mario Maragò Jun 2 '12 at 18:05

In the GRASS GIS Wiki, there is a dedicated page for this: The page demonstrates and compares a number of different methods of converting vector contour lines into raster DEM surfaces including screenshots.

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