topic Re: Zonal statistics as tabel - missing zones in ArcGIS Spatial Analyst Questions

Zonal statistics as tabel - missing zones

StefanieSteinbach — Wed, 20 Nov 2013 19:19:45 GMT

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.

Re: Zonal statistics as tabel - missing zones

EricRice — Thu, 21 Nov 2013 12:30:23 GMT

Hi Stefanie,

It's most likely related to the zone size. From the help system:

If the zone input is a feature dataset with relatively small features, keep in mind that the resolution of the information needs to be appropriate relative to the resolution of the value raster. If the areas of single features are similar to or smaller than the area of single cells in the value raster, in the feature-to-raster conversion some of these zones may not be represented.

Cell Size

Best,
Eric

Re: Zonal statistics as tabel - missing zones

StefanieSteinbach — Wed, 27 Nov 2013 13:06:22 GMT

Hi Eric,
Thanks for your reply. However, this is not the problem as I used the zonal statistics tool before with smaller polygons and got complete values. Is there a workaround?

Re: Zonal statistics as tabel - missing zones

BabakJfard — Mon, 30 Aug 2021 18:24:00 GMT

This is surprising to me that after about 8 years this problem is still happening!! here.

I am wondering if you could find an answer to your question?