Karl Wright created LUCENE-8039:
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Summary: 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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