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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
    Jun 13, 2017 at 9:27
  • The missing zones are not missing in the Input Data. I tried with mean and variance.
    – Oh-No
    Jun 14, 2017 at 12:27
  • With the "Ignore NoData in calculation" option unchecked?
    – NettaB
    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.
    – Sandeep Kumar
    Oct 15, 2017 at 22:16
  • No this is not the case. I checked off course !
    – Oh-No
    Nov 1, 2017 at 18:45

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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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