A polygon and raster layer must be loaded into ArcMap in order to use this
tool. If the polygon layer does not contain a FID field and this program fails,
it is suggested you convert it to a shapefile (as shapefiles are automatically
provided with a FID field) or add a unique FID (feature ID) field to your polygon
Naming convention for new fields.
Field names are limited to 10 letters for DBF files. The new fields are named:
ZSTAT_MIN (minimum), ZSTAT_MAX (maximum), ZSTAT_MEAN (mean), ZSTAT_STDV (standard deviation), ZSTAT_CNT (count)
NoData cells are ignored in the calculation of Zonal Statistics ++.