I am using zonal statistics in ArcGis 10.2.2 to calculate the mean value of fire frequency within 1km buffers. However, I have noticed that this is not being calculated for all of my sites. There are a few overlapping buffers in my dataset.

Is there a way to get around this?

  • We need more information about your data to help you. Screenshots, maybe data itself. – Mr. Che May 27 '16 at 10:17

Remove overlaps and zonal statistics will perform as expected.

Extract from tool help:

If the zone feature input has overlapping polygons, the zonal analysis will not be performed for each individual polygon. Since the feature input is converted to a raster, each location can only have one value.

An alternative method is to process the zonal statistics iteratively for each of the polygon zones and collate the results.

  • To compliment this answer if you were to iterate over each polygon then this can be easily done in model builder using a Feature Selection iterator feeding into the zonal stats tool. – Hornbydd May 27 '16 at 11:46

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