[Qgis-user] constructing polygons based on raster values

[Alexander Bruy]

Hi,

may be you should look at gdal_polygonize utility [0].
There is a GUI for this utility in Raster-Conversion-Polygonize

[0] http://www.gdal.org/gdal_polygonize.html

2011/8/25 Eelke Folmer <e.o.folmer at gmail.com>:
> Dear all,
> I'm looking for a way to construct a polygon file based on raster values
> (but not to make a multi-polygon for each raster cell). Similar to
> contourlines I suppose except that I want to end up with polygons. I tried
> to do it via contourlines but got messy (self-intersections) geometry when
> trying to construct polygons from the contourlines.
> Any hints on how to do this?
> Thanks,
> Eelke
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-- 
Alexander Bruy