I have a polygon with values 3, 6, 9, 12, 15, 18, 21, 24, 27 an 30. These are the time it takes for the firetruck to reach certain destinations. Now i want to compare these to another raster that have time for helicopter to reach destinations.

The problem is that when i convert the polygon to raster it doesn't keep the old values, it instead makes new ones 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20.

Is there a way to keep old values so i can make a correct calculation between the two rasters?



when you convert a feature to raster, you need to select the field that contains the values to be transfered. Make sure that the field used is the one you need.


Does anyone know how to answer this question in R or QGIS?


Use this function in Arcgis and it will work


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  • It seems like with that tool i can only extract the values from a raster? I need to do the opposite; extract values from polygon to a raster... – Kangaroo Jan 12 '16 at 13:21

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