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https://issues.apache.org/jira/browse/LUCENE-8039?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16241923#comment-16241923
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Karl Wright commented on LUCENE-8039:
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The proposal would be to add another method to GeoDistance:
computeDeltaDistance, with associated implementations and default
implementations.
> Geo3d: Need a "distance delta" distance metric for paths and circles
> --------------------------------------------------------------------
>
> Key: LUCENE-8039
> URL: https://issues.apache.org/jira/browse/LUCENE-8039
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/spatial3d
> Affects Versions: 7.1
> Reporter: Karl Wright
> Assignee: Karl Wright
>
> The current "distance" method for a path returns a distance computed along
> the path and then perpendicular to the path. But, at least in the case of
> paths, it is often preferable to compute a "delta" distance, which would be
> the minimum straight-line distance assuming a diversion to reach the provided
> point.
> A similar "distance delta" for a circle would be defined as returning a
> number exactly the same as is currently returned, with the understanding that
> the point given would be the destination and not a new waypoint. Similarly,
> the distance beyond the end of a path to the provided point would be counted
> only once, while the distance before the beginning of the path would be
> counted twice (one leg to the point, and the other leg back from that point
> to the start point (or nearest path point, if closer).
> This obviously must be implemented in a backwards-compatible fashion.
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