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polygon.buffer works incorrectly.
See original GitHub issueExpected behavior and actual behavior.
Only buffer(-1e-6) works incorrectly. it makes area to zero. But buffer(-1e-5) and buffer(-1e-7) works well. what makes this difference?
Steps to reproduce the problem.
polygon boundary data :
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(-1567709.3083706305, 21844.531770653648)]
Operating system
windows 10
Shapely version and provenance
1.6.4.post2 installed with pip
Issue Analytics
- State:
- Created 3 years ago
- Comments:8 (6 by maintainers)
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@mwtoews I was about to post almost exactly the same screenshot of JTS testbuilder but you beat me to it!
This is a bug with GEOS master (ish) on Linux, as confirmed with PostGIS. The buffer returns
POLYGON EMPTY. The valid input has hex-encoded WKB:It is not a bug with JTS, which returns a non-empty:
There is a history of buffer robustness issues with JTS/GEOS, see this trac from ~9 years ago. Also, anyone that follows @dr-jts will know there are some fantastic advancements with OverlayNG in JTS that provide more robust buffer outputs, read about them here. Paul Ramsey has started porting this to GEOS, and would appreciate some help.