1

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?

Pic

3

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.

-1

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

-2

Use this function in Arcgis and it will work

http://resources.arcgis.com/en/help/main/10.1/index.html#//009z0000002t000000

We're looking for long answers that provide some explanation and context. Don't just give a one-line answer; explain why your answer is right, ideally with citations. Answers that don't include explanations may be removed.

  • 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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