[jira] [Resolved] (LUCENE-7158) Haversin should use the earth's mean radius, not its max (equitorial)?

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless resolved LUCENE-7158.
----------------------------------------
       Resolution: Fixed
    Fix Version/s: 6.0
                   master

> Haversin should use the earth's mean radius, not its max (equitorial)?
> ----------------------------------------------------------------------
>
>                 Key: LUCENE-7158
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7158
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Michael McCandless
>             Fix For: master, 6.0
>
>         Attachments: LUCENE-7158.patch, LUCENE-7158.patch
>
>
> Across our spatial modules we seem to disagree about the earth's radius when we model it as a sphere.
> I think in our haversin implementation we use equitorial (maximum) radius, but maybe in spatial3d we use the earth's mean radius.
> I think mean makes more sense: the earth is actually a squashed sphere, so it's polar radius is shorter than its equitorial radius.
> I think it's important, when we model the earth as a sphere, that we pick one radius and try to use that one consistently?



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