topic How do I assign average raster values to polygons within a shapefile in ArcGIS Pro Questions

How do I assign average raster values to polygons within a shapefile

DavisTolman — Thu, 06 Oct 2016 21:33:14 GMT

I have a raster file (elevation) and a shape file (neighborhood polygons). I would like to sample the raster for each polygon and assign the average raster value to its' respective polygon. Ideally I would add a new column with the average elevation for each row in the shape file.

Re: How do I assign average raster values to polygons within a shapefile

ChrisDonohue__GISP — Thu, 06 Oct 2016 21:39:31 GMT

If you have access to Spatial Analyst, one possibility is to use Zonal Statistics, with the statistics_type (optional) of Mean:

ArcGIS Help (10.2, 10.2.1, and 10.2.2) Zonal Statistics

Chris Donohue, GISP

Re: How do I assign average raster values to polygons within a shapefile

DavisTolman — Fri, 07 Oct 2016 16:09:57 GMT

Thanks Chris,

I tried this and created a raster with the shape of the subdivisions that

assigned a single average value for the entire raster, not the average for

each separate polygon. Ideally, I would like to extract the average value

for each polygon and add it as a field in the subdivision shapefile. Any

thoughts?

Davis Tolman

Re: How do I assign average raster values to polygons within a shapefile

DavisTolman — Fri, 07 Oct 2016 16:19:33 GMT

I tried again using he correct zone field and it worked.

THANKS VERY MUCH!

Davis

Re: How do I assign average raster values to polygons within a shapefile

AmyNewsam — Mon, 08 Jul 2024 20:16:32 GMT

Is there any way to do this when the raster data isn't integer type? I have a kriged raster, so the values are not integers.

Re: How do I assign average raster values to polygons within a shapefile

AmyHut — Tue, 14 Jan 2025 00:36:12 GMT

Hi Amy,

Did you find a method that works for non-integer raster values? I'm wanting to do the same thing.

Thanks,

Amy

Re: How do I assign average raster values to polygons within a shapefile

AmyNewsam — Tue, 14 Jan 2025 18:10:25 GMT

Hi Amy,

I'm sorry, I don't recall and unfortunately I can't seem to find my notes on that project. I was likely helping a student and they ended up doing something else. If you find an answer though, please post it here!

Amy