Zonal statistics as tabel - missing zones

Discussion created by Stefanie.Steinbach on Nov 20, 2013
Latest reply on Nov 27, 2013 by Stefanie.Steinbach
Hi all,
A lot has been posted about missing zones using this tool, but I could not find anything useful for my problem.
I have derived about 200 subcatchments from a dem and converted them to polygon. After using zonal statistics as table to get a mean value for slope and the topographic wetness index within these zones a whole lot of zones is missing; the others are calculated as usual. Does anyone know what the problem could be related to?
Any hint is much appreciated.