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I have a point shape file and one of the attribute refers to the altitude. Is is possible to obtain a contour lines shape file in GRASS?

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I'm guessing 16032 was referring to the GRASS modules in QGIS.

First: Interpolation Then: Contours

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Consider also grasswiki.osgeo.org/wiki/Interpolation --> "Interpolating from vector points" –  markusN May 7 '13 at 22:33
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In Qgis: Raster>Grid/Interpolation then Raster > Extraction > Contour

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That's great! Isn't a similar command in grass? –  matteo May 7 '13 at 10:59
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