[geos-devel] Polygon simplicity and validity

[Sean Gillies]

Is simplicity meaningful for polygons or only for lines? Here's a
single ring bowtie that GEOS 3.3.0 reports as invalid but simple:

POLYGON ((39.1451330299999967 23.7510081600000014, 97.0537220899999937
40.5455008799999987, 105.2652701399999984 48.1330221300000005,
100.9175268500000016 58.4333681499999997, 71.5608144800000048
83.5511480100000057, 60.7118916800000008 86.2531609899999978,
62.0046980799999972 75.1478175999999962, 83.1631000699999987
42.8207167300000009, 92.8230586199999976 37.1917558199999974,
95.9940112900000031 26.4705124599999984, 106.2205448200000006
15.5197519199999991, 39.1451330299999967 23.7510081600000014))

https://github.com/Toblerity/Shapely/issues/16#issuecomment-8116396

-- 
Sean Gillies