Why the parameter "near" is not avaible for api search on twitter?

What i can't understand is...

I can search on search.twitter.com this query:@twitter OR @twitterapi
near:Brasil
http://search.twitter.com/search...@twitter+or+@twitterapi+near:Brasil

If i click on Feed for this query i can get this result for the query
above:
http://search.twitter.com/search.atom?geocode=-14.235004,-51.92528,2500.0km&lang=en&q...@twitter+or+@twitterapi+near:Brasil

if i change atom for json, it's ok.

but it's not possible to do this: (without geocode parameter)
http://search.twitter.com/search.atom?lang=en&q...@twitter+or+@twitterapi+near:Brasil

So, why i can't just use near with api??
How i get the geocode with api??
How i get this feed with api??

Best Regards.

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