Twitter Rest API 1.1 Geo/search Rate limit Exceeded


We are using twitter rest API for Geolocation analysis. we are using OAuth Authentication and searching for tweets in a given lat long search.

First time it is giving results, soon after 15 mins when we Try Error thrown with message “Rate limit exceeded”.

We are using this API call for every 15 mins of a given lat long(same/different)

Please suggest how the rate limit defined, how frequently we can call the service to get the results…