1. A method of estimating the location of a mobile device in a geographic region comprising the steps of: (a) providing calibration data for each of one or more calibration points in a geographic region, said calibration data including at least one characterizing parameter (b) receiving a network measurement report from a mobile device at an unknown location, said network measurement report also including at least one characterizing parameter; (c) defining a first region within said calibration data as a function of a first characterizing parameter of said network measurement report and a predetermined range of said first parameter; (d) defining a second region within said calibration data as a function of another characterizing parameter of said network measurement report and a predetermined range of said another parameter; (e) repeating steps (c)-(d) for each characterizing parameter in said network measurement report; (f) determining an intersection of each defined region; and (g) estimating the location of a mobile device in said geographic region as a function of said intersection.