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  1. Lucene - Core
  2. LUCENE-7158

Haversin should use the earth's mean radius, not its max (equitorial)?

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Details

    • Improvement
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 6.0, 6.1, 7.0
    • None
    • None
    • New

    Description

      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?

      Attachments

        1. LUCENE-7158.patch
          17 kB
          Karl Wright
        2. LUCENE-7158.patch
          14 kB
          Michael McCandless

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            Unassigned Unassigned
            mikemccand Michael McCandless
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              Created:
              Updated:
              Resolved: