How do I combine (join?) two overlapping polygons to determine the combined area they cover in ArcGIS 10?
I am sure the Geoprocessing tools can do it, but just how eludes me.
You're looking for the Dissolve tool - if all of your polygons are in the same featureclass/layer just run it and then use the Field Calculator to determine the area.
If your polygons are in different featureclasses, run the Merge or Append tool first.
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