Buffer issues

K 's Avatar


10 Jun, 2021 09:38 PM

The discussion below is exactly my problem, the staff response below does not help me with my issue.
Please help!

"Interior of buffer incorrectly included
Oren Levin's Avatar
Oren Levin
Jul 15, 2018 @ 10:12 AM

I am trying to create a buffer area but found that when the outside edges of the buffer zone overlap, the polygon created includes the inner area that should be excluded. See https://sartopo.com/m/G7NK for an example.

The buffer should start at the lower right and follow the trail northwest before turning northeast and then south around the lake. Given a 50-meter buffer, the center should not be included in the polygon.

Compare with https://sartopo.com/m/8BQG

I believe that issue is that when the outer edge of the buffer zones touch, SARTopo is not adding the inside area as an island to exclude from the final area.

SUPPORT STAFF1 Posted by matt on Jul 15, 2018 @ 01:13 PM

matt's Avatar
SARTopo does not support polygon interior rings, and the only way to show that buffer without interior rings is to either have parts of the polygon overlap itself (which would cause other issues), or omit the donut hole."

  1. Support Staff 1 Posted by Ben Lantow on 10 Jun, 2021 09:53 PM

    Ben Lantow's Avatar

    Hi there,
    Unfortunately nothing has changed from the discussion you reference. We do not support polygons with holes still, and therefore we fill in the buffer when there is an interior hole. I would not anticipate any changes to that soon.



  2. Ben Lantow closed this discussion on 10 Jun, 2021 09:53 PM.

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