Local Lucene
Is an extension to Lucene http://lucene.apache.org/ to provide geographical based
searching.
There are also enhancements to filtering providing optimized performance to multiple filters, which
can be used outside of Lucene.
A white paper exists http://www.nsshutdown.com/projects/lucene/whitepaper/locallucene.htm Geographical Based Searching solution using Lucene
And the software exists http://www.nsshutdown.com/viewcvs/viewcvs.cgi/locallucene/ Local Lucene