5

When using the GDAL plugin, "Polygonize (raster to vector)" any values in the resulting vector layer is truncated to integer.

I have a raster showing windspeeds in squares of 500*500 meters, in the metadata-field i read that the lowest value is 2.5899999142 and the highest value is 12.6599998474. Then when polygonizeing, the result layer only has values: 0, 1, 2, 3... and so on. No decimals.

I have googled the issue and found this: http://trac.osgeo.org/postgis/ticket/650 Don't know if it helps though.

4

Perhaps you could multiply your wind speed values using the raster calculator, by 10 if you want to keep the value to 1 decimal place, then export the result to polygon, add a new field to your polygon layer and use the calculator to populate its values by dividing the raster value by 10

  • 1
    Yes! I can verify that this will work! Thank you for your answer. I have to say though, that even if this will do the job, I think it is kind of a workaround and this should be fixed in a future update. – Patrik Aug 12 '13 at 11:26

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