Tuesday, 15 November 2016

Identifying which singlepart non-overlapping polygons are islands using ArcGIS for Desktop?


Is there a simple method to select singlepart non-overlapping polygons in a single feature-class which are not contiguous with other polygons ie they are island polygons?



Answer



This is untested but to do this I would try these steps:



  1. Polygon Neighbors to create a table of polygon neighbors - islands should have no records in this table


  2. Use a join between the feature IDs in the feature class and the neighbors table to select any that match - these are not islands

  3. Switch selections in the feature class


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