You may want to check out these links:
Read the following GettingStarted section.
http://code.google.com/p/geopy/wiki/GettingStarted
Using the above tool, you can write a python script to put your lat, lng
values in the datastore .  Read this, and it will show you how.

http://pypi.python.org/pypi/geomodel

<http://code.google.com/appengine/articles/django-nonrel.html>Here some
other tutorials with code to help you:

http://pypi.python.org/pypi/geomodel/0.1.0
http://code.google.com/p/geopy/

Also, look at the code in the PubSchool demo
http://code.google.com/p/geomodel/source/browse/trunk/demos/pubschools.

On Mon, May 16, 2011 at 2:53 PM, Ikai Lan (Google) <ika...@google.com>wrote:

> We do not currently support geospatial queries.
>
> You'll want to star the issues here that fit your needs:
>
>
> http://code.google.com/p/googleappengine/issues/list?can=2&q=geo&colspec=ID+Type+Component+Status+Stars+Summary+Language+Priority+Owner+Log&cells=tiles
>
> Alternatively, I'm told that Fusion Tables can meet this requirement for
> you:
>
> http://www.google.com/fusiontables/Home
>
> (Haven't tried myself, though)
>
> Ikai Lan
> Developer Programs Engineer, Google App Engine
> Blog: http://googleappengine.blogspot.com
> Twitter: http://twitter.com/app_engine
> Reddit: http://www.reddit.com/r/appengine
>
>
>
> On Wed, May 11, 2011 at 7:53 PM, Shash Joshi <sh...@perfode.com> wrote:
>
>> I saw the documentation on bigtable fields, one of them is
>> "geographical point". Is there an function to find all records within
>> a certain radius of given lat and long.
>>
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