Zonal Statistics - too many values?

Discussion created by triphook3 on Sep 13, 2011
Latest reply on Sep 14, 2011 by triphook3
I have a large polygon layer representing a few thousand fields, and raster layer with 3 land cover classes.  I would like to summarize each field with a single land cover class, and the only tool I can think of to accomplish this is Zonal Statistics.

Problem is, when I try to run Zonal Statistics, I get ERROR 999999, "Too many unique values".  What are the limitations on this tool, and is there a better way to perform this summary?