Spatial join polygon-to-polygon using "closest" as join field

Discussion created by aaridd18 on May 30, 2012
Latest reply on May 30, 2012 by nahmed-esristaff
Hi all,

Just a quick question about how using a spatial join with "closest" as the match option works. I'm trying to spatially join a shapefile of world ecoregions with a shapefile of world country boundaries to get a country code for each ecoregion. Since ecoregions pass over country boundaries, I'd like to select the country code where most of the ecoregion falls, and I'm trying to figure out if "closest" is the best option for this; however the technical info on how "closest" works for polygon-to-polygon matches isn't very detailed. Can anyone give me more info on how this option works (i.e. does it use centroids or boundaries as the point of measurement, etc).