I have a problem using zonal statistics in ArcGIS.

My raster contains values/data with 30m cells.

I had several vector layers, containing administrative subdivisions of Belgium. I have converted the vector layers to raster data with the Polygon to Raster tool. I used the cell center assignment and used the same cell-size than that of my value raster data.

Each time I use zonal statistics, 2 zones are missing. I don't understand why ?

It's not a size problem as these are not necessary the smallest zones.

I tried the same procedure using another raster data sets for defining the zones, and the same occurs at a different location.

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  • Which Statistics type did you use? Is your "Input value raster" area contains the missing zones?
    – NettaB
    Commented Jun 13, 2017 at 9:27
  • The missing zones are not missing in the Input Data. I tried with mean and variance.
    – Oh-No
    Commented Jun 14, 2017 at 12:27
  • With the "Ignore NoData in calculation" option unchecked?
    – NettaB
    Commented Jun 14, 2017 at 22:27
  • Lame answer but may help Check wether the zone is not white out due to Black white symbology try to use plain symbology only black and check output data coverage. Commented Oct 15, 2017 at 22:16
  • No this is not the case. I checked off course !
    – Oh-No
    Commented Nov 1, 2017 at 18:45

1 Answer 1


The only time I have had a similar issue, it was because my Processing Extents were out of wack. Here is what I did: Go to Environment Settings > Processing Extent > Extent: Union of Inputs. I'm not sure if this is the issue, but hope it helps.

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