How to create outline of complex polygon?

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12-21-2019 01:14 PM
New Contributor III

I'm trying to create an outline of a complex polygon.  The polygon in question can be seen here (edit: I've attached the images below).  This is an elevation model of an alluvial flow.  As you can see, there are many little "islands" in the middle of the flow.  I just want the greater outline of the flow, as demonstrated here (a poor hand-made outline in MS Paint...). For a sense of scale, this is about 10 km wide.

The attribute table for the polygon only has a single row, so I can't just edit out the islands.  I've tried Buffer, Dissolve, and Union, all basically end up looking about the same. 

Any advice on how to proceed would be appreciated.



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MVP Emeritus
New Contributor III

Thanks Dan, that's exactly what I needed.

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