1. A method of estimating the location of an object within a geographical area based upon potential object location data reported by a plurality of mobile devices having location determining means, the method comprising: collecting potential object location data from the plurality of mobile devices, dividing the geographical area into a plurality of regions, and for at least some of the regions: determining information indicative of the distance between a point associated with a region and the potential object location reported by at least some of the mobile devices, and applying an estimator model to assign a score to the point indicative of a probability that the point corresponds to an actual object, and estimating the location of the object based upon the scores assigned to the points.