Lucene.Net search "Local results" based on geographic location

Question

Good afternoon,

I'm looking for some info so that users can find local results in their Lucene.Net searches.

I would index the Latitude / Longitude in the document, and query Lucene based on the users latitude/longitude and 20 (or 30, 40...) mile range.

Any help would be appreciated.

Answer 1

Not so trivial task. Here are some pointers:

http://en.wikipedia.org/wiki/R-tree

http://sourceforge.net/projects/geolucene/

Answer 2

The utmost on local search in Lucene is Grant Ingersoll's Location-aware search with Apache Lucene and Solr. Trouble is that Lucene.net lags after Java Lucene, so that these Lucene features available with the rather new Lucene 2.9.0 will take a while to trickle into Lucene.net (Lucene.net 2.4.0 came about a year after Java Lucene's 2.4.0). In the meantime, try Spatial.net in Lucene.net's contrib, or you can try to port Sujit Pal's suggestions from Java to C#.