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I have a layer representing a neighborhood. And the roads are separating groups of features(blocks) from each other. I want an outline around the whole neighborhood and not around each feature or each block. I want a line around the whole layer. I have tried dissolving, masking and merging. None have worked.

How could I do this using ArcGIS Desktop?

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  • Have you tried to use a concave hull? – vinh Oct 20 '17 at 11:19
  • vinh I don't know what that is... could you please guide me? – user107620 Oct 20 '17 at 11:38
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If you have an Advanced level license, the Aggregate Polygons tool will do the heavy lifting:

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Remaining holes are easy to fix by hand, alternatively apply this field calculator expression on field "Shape" of output:

arcpy.Polygon(!Shape!.getPart(0))

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