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https://issues.apache.org/jira/browse/GEOMETRY-100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17158173#comment-17158173
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Baljit Singh commented on GEOMETRY-100:
---------------------------------------
(y)
> Invalid result for small spherical polygons
> -------------------------------------------
>
> Key: GEOMETRY-100
> URL: https://issues.apache.org/jira/browse/GEOMETRY-100
> Project: Apache Commons Geometry
> Issue Type: Bug
> Reporter: Baljit Singh
> Priority: Blocker
> Fix For: 1.0
>
>
> h2. First test case: small spherical rectangle
> * Precision/Tolerance: {{EpsilonDoublePrecisionContext[epsilon=
> 1.5696101377226165E-12]}}
> * Spherical polygon/rectangle vertices: {{[(5.050647792392463,
> 0.8263048984534946), (5.050644504477406, 0.8263064367456399),
> (5.050649564478115, 0.8263123289902004), (5.050652852378331,
> 0.8263107907013917)]}}
> h4. Centroid:
> * Expected (approximately the average of vertices): {{(5.050648678475973,
> 0.8263086112510253)}}
> * Actual: {{(5.0506454742491504, 0.8263177505886343)}}
> The difference looks small, however, the actual result is outside the polygon.
> h4. Area (size):
> * Expected: 2.0005645375711432E-11
> * Actual: 1.9971579945377016E-11
> h4. Perimeter (boundary size):
> * Expected: 1.9679779440894825E-5
> * Actual: 1.96697104639384E-5
> h2. Second test case: small circular (sphere) polygon
> * Precision/Tolerance: {{EpsilonDoublePrecisionContext[epsilon=
> 1.5696101377226165E-12]}}
> * Circle discretized with 100 vertices: center: {{(0.5410520681182421,
> 1.3962634015954636)}}, radius: {{4.784171699778536E-8}}
> h4. Centroid:
> * Expected (approximately circle center): {{(0.5410520681182421,
> 1.3962634015954636)}}
> * Actual: {{null}}
> h4. Area (size):
> * Expected: 7.181590857887451E-15
> * Actual: 0.0
> h4. Perimeter (boundary size):
> * Expected: 3.0054894917112657E-7
> * Actual: 3.005489492811408E-7
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