title: Specify area of operation and verify if a location falls within this region
body: <p>I am pretty new to mobile development, so kindly excuse this seemingly trivial question. I want to specify the area of operation for an organization and whether a location(lat, long) entered by a mobile app user (android, iphone etc.) comes under the area of operation. I need some high level ideas. One approach that comes to my mind is having a collection of areas(specified by a lat, long pair and a radius) in the database, may be sorted by different administration level, and thereafter, verifying the user's location(lat, long) against this data from the server. Is it the right approach or is there any other approach? Any guide is welcome. Thanks in advance.</p>