topic Re: How to sum a single attribute field of overlapping buffers in a single shapefile? in Spatial Statistics Questions

How to sum a single attribute field of overlapping buffers in a single shapefile?

JustinCoughlin1 — Wed, 12 Aug 2015 22:28:54 GMT

Hi all,

I have a single buffer shapefile that contains an area-weighted concentration in one of the attribute fields. I want to sum concentration values from the overlapping buffers within the single shapefile so that I can create a raster image of the summed value. This raster image will then be used to extract the summed values to points. I have a screenshot below of the shapefile.

Just to clarify again, that is a single shapefile so many of the coverage tools don't seem to work. When I have tried summary statistics, it won't export the table to a database. Intersecting it on itself doesn't seem to work. There's no way to do a spatial join (that I know of) because it is only a single file. I've tried dissolving it and doing a polygon to raster but the numbers don't seem to come out right and I believe I'm only getting the top-most buffer value. Does anyone know of an add-in or an appropriate procedure to deal with this issue? Any and all help is much appreciated.

Cheers,

Justin Coughlin

Re: How to sum a single attribute field of overlapping buffers in a single shapefile?

DarrenWiens2 — Wed, 12 Aug 2015 23:04:34 GMT

Re: How to sum a single attribute field of overlapping buffers in a single shapefile?

XanderBakker — Wed, 12 Aug 2015 23:29:23 GMT

The thread Darren Wiens refers to provides the steps to get the result you are looking for.

A silly question; do you have to have a vector output or is raster also acceptable. The reason I ask is that this type of analysis (starting from the points) is normally performed in raster (which would require the Spatial Analyst extension), see: Point Density—Help | ArcGIS for Desktop and Kernel Density—Help | ArcGIS for Desktop