[jira] [Commented] (GEOMETRY-71) Investigate Spherical Barycenter Accuracy

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[jira] [Commented] (GEOMETRY-71) Investigate Spherical Barycenter Accuracy

Otto Fowler (Jira)

    [ https://issues.apache.org/jira/browse/GEOMETRY-71?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17013584#comment-17013584 ]

Gilles Sadowski commented on GEOMETRY-71:
-----------------------------------------

bq.  we can merge PR 51 now

Done in commit dd5c19b1674e067d874fe10dc83ef53101e67faf ("master" branch).

> Investigate Spherical Barycenter Accuracy
> -----------------------------------------
>
>                 Key: GEOMETRY-71
>                 URL: https://issues.apache.org/jira/browse/GEOMETRY-71
>             Project: Apache Commons Geometry
>          Issue Type: Bug
>            Reporter: Matt Juntunen
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The current code for computing spherical barycenters in {{ConvexArea2S.getBarycenter()}} seems to suffer from floating point accuracy issues. The {{ConvexArea2STest.checkBarycenterConsistency()}} method checks the consistency of the barycenter computation of a region by splitting the region into two sections, computing the area and barycenter of each section, and then computing the combined barycenter of the sections by adding the barycenter of each scaled by its corresponding area. It is expected that the combined barycenter computed in this way should equal the barycenter computed for the region as a whole. However, in practice, a large epsilon value is needed in the comparison in order for the tests to pass. We need to investigate why this is the case.



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