1. A method for localizing a vehicle, the method comprising the steps of: detecting an object with a location sensor, the object disposed in a generally upward direction from the vehicle, approximately overhead of the vehicle, the object disposed in proximity to the vehicle, wherein the object is detected by emitting a signal via a beam with a defined edge via the location sensor in the generally upward direction approximately overhead of the vehicle, and receiving, via the location sensor, a return signal that is reflected from the object while the vehicle is travelling; correlating the object via a processor with information from a map database, thereby generating a correlation; and determining via the processor a geographic location of the vehicle based on the correlation, for augmenting data provided by a global positioning system (GPS); wherein the step of determining the geographic location of the vehicle comprises: determining a first indication of the geographic location of the vehicle based on data provided by the GPS, the first indication comprising a geographic region for the vehicle; determining a second indication of the geographic location of the vehicle based on a refinement of the first indication based on the correlation between the detected overhead object and the map database, and based on a position of the detected overhead object within the geographic region; and determining a third indication of the geographic location of the vehicle, the third indication comprising a further refinement of the second indication of the geographic location based on a measured velocity and direction of travel of the vehicle, as determined via measurements from one or more vehicle position or movement sensors, from a first point in which the object is detected overhead the vehicle and the vehicle is approximately directly underneath the object, to thereby provide the refined third indication while the vehicle is travelling from the first point that is approximately directly underneath the object to a second point that is approximately directly underneath a second object that is detected overhead the vehicle subsequent to the detection of the first object, wherein the one or more vehicle position or movement sensors are disposed onboard the vehicle and are configured to measure a position or movement of the vehicle.