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How to delineate/draw the edge of polygon automatically?

Question asked by zihan0829 on Feb 7, 2017
Latest reply on Feb 22, 2017 by zihan0829

I would like to delineate the edge of my extraction below, not by hand, just automatically. I want to eliminate the inside polygons and keep the outermost edge only (highlighted by blue, not accurately). Could anyone give me some hints on this part? Thank you in advance!

Edge extraction