http://arstechnica.com/civis/viewtopic.php?f=20&t=1115412

has quite a few tips.

On Dec 29, 3:12 am, Jason Brower <encomp...@gmail.com> wrote:
> I know we can find good inforamtion geographical stuff in teh web2py
> manual.  But is there a way to, for example, find things in a search
> area around a coordinate?
> My guess is that I should do the following:
> Get the logged in users geo information (lat and long)
> Get the distance away that I want to search around that person and
> calculate the lat and logitudes of that area...
> Find if the lat and log of the items.lat and items.long in my database
> are within the regions of the users.lat and users.log and the (areas.lat
> and areas.long)* for for four directions.
> Does that make sences?  Would that be the best aproach?
> Best Regards,
> Jason Brower

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