[Qgis-user] constructing polygons based on raster values

[Eelke Folmer]

That worked well after creating a new raster with a logical operator (in 
RasterCalc). Thanks for your answer and bringing this functionality to QGIS.
Eelke


Op 8/25/2011 4:10 PM, Alexander Bruy schreef:
> 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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