Dan Rosher created SOLR-16292:
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Summary: NVector for alternative great-circle distance calculations
Key: SOLR-16292
URL: https://issues.apache.org/jira/browse/SOLR-16292
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Components: search, spatial
Affects Versions: 9.0
Reporter: Dan Rosher
[N-Vector|https://en.wikipedia.org/wiki/N-vector#Example:_Great_circle_distance]
is a three-parameter representation that can be used to calculate the
great-circle distance (assuming a spherical Earth).
This implementation makes use of fast implementation of acos I wrote, that
approximates acos with a maclaurin series expansion.
For small distances it compares well with Math.acos, and is a faster way of
calculating the great-circle distance than Haversine.
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