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I am working on a project looking at county boundaries for the state of California. I have 2 polygon datasets with this same geographic boundary, and these datasets, when mapped individually, visually appear to have a spatial correlation. Polygons are mapped according to numerical attribute values, which range widely on both datasets.

Wondering what the best method might be to test for a correlation between these datasets?

  • You may want to review previous Questions on Correlation using ArcGIS for Desktop here. – PolyGeo Jan 22 '15 at 23:34
  • I am using shape files in ArcMap 10.1. – Jessica White Jan 23 '15 at 1:02
  • If both shapefiles are of identical spatial features, you can skip most of the steps in FelixIP's answer. If they both share a unique ID field (FIPS, county name, etc.), you can simply join one to the other. It doesn't sound like this is a necessarily spatial issue; is that correct? – Tom Dec 10 '15 at 15:45
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  1. Intersect 2 layers
  2. Add field [Times] and calculate it using 2ndNumeric*ShapeArea
  3. Summarise field [Times] and [ShapeArea] using first layer UniquPolygonId
  4. Divide [Sum_Times] by [Sum_Area], this will give you weighted second layer numeric
  5. Transfer result to 1st polygon table and check the correlation between 2 columns, i.e. 1st numeric and weighted one

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