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Why are zonal statistics not calculated or inaccurately calculated for some zones?
The Zonal Statistics and Zonal Statistics as Table tools calculate statistics for rasters within zones set by a feature dataset. In some instances, the tools either do not produce outputs, or produce inaccurate results for some zones. Since the tools calculate statistics for raster cell values within a zone, such as a polygon boundary, the calculations are based on cells with centroids that fall within the boundary. If the raster cell size is larger than a given boundary, there may be no cells with centroids within the boundary, and hence no statistics or inaccurate statistics are produced for that zone.
The following are best practices when using the Zonal Statistics and Zonal Statistics as Table tools: