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I have a set of points in ArcMap which I create a buffer for each point. Then I use intersect to extract the overlapping buffers. The result is something like this: enter image description here

The lighter color are the overlapped layer. Weird thing is that on the left, the overlapped buffer is rather incorrect, is it? Any idea what is going on?

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Are there two (duplicate) points directly on top of one another in the center of the completely filled circle? –  dmahr Feb 22 '12 at 2:59
    
@dmahr, I think you just pointed something I stupidly overlooked. Indeed the "weird" looking overlapped buffers are actually 6 points (6 buffers) whereas the right one are just perfectly 2 overlapped buffers. Thank you for pointing this out. –  thchew Feb 22 '12 at 3:17
    
I'm glad I could help! –  dmahr Feb 22 '12 at 3:31
    
@dmahr could you add this as an answer please; all good work deserves a turn! Thanks Matt –  Hairy Feb 23 '12 at 20:36
    
@Hairy Done! I'll do this in the future. –  dmahr Feb 23 '12 at 20:45
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1 Answer

(Added this as an answer, as requested)

You may have multiple, duplicate points overlying one another in the "incorrectly" filled circle. I would use the Identify tool and draw a marquee around the center of the "incorrectly" filled circle and see if there are multiple point features in the Identify pane.

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cheers fir that –  Hairy Feb 23 '12 at 21:00
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