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From "Karl Wright (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-7942) For Geo3d paths, aggregating distance values using "+" is not adequate for squared distances
Date Mon, 28 Aug 2017 04:58:00 GMT
Karl Wright created LUCENE-7942:
-----------------------------------

             Summary: For Geo3d paths, aggregating distance values using "+" is not adequate
for squared distances
                 Key: LUCENE-7942
                 URL: https://issues.apache.org/jira/browse/LUCENE-7942
             Project: Lucene - Core
          Issue Type: Bug
          Components: modules/spatial3d
            Reporter: Karl Wright
            Assignee: Karl Wright


The GeoStandardPath object aggregates distances segment by segment using simple addition.
 For some kinds of Distance computations, though, addition is not an adequate way to do this.
 The xxxSquaredDistance computations, for example, do not produce true squared distances but
rather a distance metric that is a combination of both squared and linear.

I propose adding support in Distance for aggregation, which would allow distance calculators
to compute an accurate distance (at some computational cost) instead.




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