[Qgis-user] constructing polygons based on raster values

[Agustin Lobo]

Another way is with vector/Research tools/Vector grid
agus

2011/8/25 Eelke Folmer <e.o.folmer at gmail.com>:
> 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
>>> _______________________________________________
>>> Qgis-user mailing list
>>> Qgis-user at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
>>>
>>
>>
>>
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