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https://issues.apache.org/jira/browse/LUCENE-4208?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423638#comment-13423638
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David Smiley commented on LUCENE-4208:
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Thinking more about this, I like the overall curve shape of the inverted
distance but it definitely has problems. For example if the query center is
practically on top of some data point then the score ends up being close to
infinity. And how quickly the score curve slides is doesn't vary based on the
overall query shape; I think it should.
The reciprocal makes sense: c/(x+c) where x = the distance. 'c' is roughly
1/10th of the distance to the query shape edge.
> Spatial distance relevancy should use score of 1/distance
> ---------------------------------------------------------
>
> Key: LUCENE-4208
> URL: https://issues.apache.org/jira/browse/LUCENE-4208
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/spatial
> Reporter: David Smiley
> Fix For: 4.0
>
>
> The SpatialStrategy.makeQuery() at the moment uses the distance as the score
> (although some strategies -- TwoDoubles if I recall might not do anything
> which would be a bug). The distance is a poor value to use as the score
> because the score should be related to relevancy, and the distance itself is
> inversely related to that. A score of 1/distance would be nice. Another
> alternative is earthCircumference/2 - distance, although I like 1/distance
> better. Maybe use a different constant than 1.
> Credit: this is Chris Male's idea.
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