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To convert raster grids to vector points In QGIS there we have different possibilities (grass tool "to.vect"; saga tools "grid values to points").

My problem is a little bit complicated. In the beginning I have a point layer. For further data processing I need to convert the vector points to a raster file (every point is a raster now). In the end I want to convert this raster (raster points) backwards to a point layer for the kriging tool.

The grass tool (to.vect) is very slow and the saga tools (grid values to points) gives me more than just the points I need to have (I get a very high density point shape). Is there another solution just to convert the few rasters into a point layer?

PolyGeo
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Pimpel
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    Can you clarify: Do you want the same points in the output that you had in the original input point layer? If not, which points do you want? – underdark Feb 16 '15 at 19:37
  • Yes I just want to convert the "raster points" which I had in my original point layer. – Pimpel Feb 17 '15 at 09:17
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    In that case, I think you should use the original points to sample your raster layer. This will add the raster values to the original point geometries. – underdark Feb 17 '15 at 20:19
  • Which tool do I have to use for that? – Pimpel Feb 17 '15 at 20:22
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    See http://gis.stackexchange.com/questions/3538/extract-raster-values-at-points – underdark Feb 17 '15 at 20:46

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