I implemented this a while back and it worked pretty well after a few stumbles. If you have any questions trying to set it up feel free to contact me username@gmail.com
I would be playing around with such stuff soon, seems like similar features have been added under lucene/contrib-spatial. Nice to find someone who sailed in the same boat :)
Yea - I came in without a strong Solr/Lucene background so had to learn on the fly. I also needed to tie the data import with a MySQL database so ended up running into some issues with that - mostly having to do with the additional types that the Local Lucene package required.
"It's almost like I'm famous" - Patrick O'Leary, upon seeing his project on Hacker News.