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.
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
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
Did you find a method that works for non-integer raster values? I'm wanting to do the same thing.
Thanks,
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.
I tried again using he correct zone field and it worked.
THANKS VERY MUCH!
Davis
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
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