[LUCENE-7069] Add LatLonPoint.nearest to find closest indexed point to a given query point

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 6.1, 7.0
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 06/Mar/16 11:47
• Updated: 28/Aug/22 14:51
• Resolved: 14/Apr/16 15:05

Description

KD trees (used by Lucene's new dimensional points) excel at finding "nearest neighbors" to a given query point ... I think we should add this to Lucene's sandbox as:

  public static Document nearest(IndexReader r, String field, double lat, double lon) throws IOException

I only implemented the 1 nearest neighbor for starters ... I think we can easily generalize this in the future to K nearest.

It could also be generalized to more than 2 dimensions, but for now I'm making the class package private in sandbox for just the geo2d (lat/lon) use case.

I don't think this should go into 6.0.0, but should go into 6.1: it's a new feature, and we need to wrap up and ship 6.0.0 already

Issue Links

• is related to: LUCENE-7974 Add N-dimensional FloatPoint K-nearest-neighbor implementation