FAIK, There are no columns per se. But in the past I've just used UTM
values for each lat lon and just do
basic numeric operators >, < to search within a bounding geographic
region. Add them as numeric fields though. Easy.

There is new support for spatial searching, however I'm not sure how it
compares to what I described, which works great.
Probably does some automatic conversions or something. Check the wiki.

On Sat, 2010-04-17 at 18:39 -0700, Dennis Gearon wrote:

> How does solr/lucene do geometric distances?
> 
> Does it use a GEOS point datum, or two columns one for latitude, one for 
> longitude?
> 
> 
> Dennis Gearon
> 
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