dbigelow12

Zonal Statistics not working for a subset of polygons

Discussion created by dbigelow12 on Oct 3, 2012
Latest reply on Oct 5, 2012 by dbigelow12
I have a sample of 531 polygons (taxlots). I am trying to attribute the mean value of a precipitation raster to each polygon in my shapefile. However, when I run the Zonal Statistics as Table tool, I am only getting the desired values for 468 of the 531 polygons. The problem persists if I use Zonal Statistics (not as Table) instead. One thing I've noticed is that the polygons for which I am not getting values tend to be small (i.e. less than a half-acre). Has anyone else encountered this problem before? Namely, is there a threshold polygon size for Zonal Statistics, below which the tool will not work?

I know that as a workaround I could convert the precipitation raster to a polygon and then clip and intersect it with my taxlots, but I don't want to go that route if it's not absolutely necessary. Any help would be greatly appreciated. Thanks!

Outcomes