Map matching denotes a procedure that assigns geographical objects to locations on a digital map. The most typical geographical objects are point positions obtained from a positioning system, often a GPS receiver. In typical uses, the GPS positions derive from a receiver located in a vehicle or other moving object traveling in a road network, and the digital map models the embedding into geographical space of the roads by means of polylines that approximate the center lines of the roads. The GPS positions generally do not intersect with the polylines, due to inaccuracies. The aim of map matching is then to place the GPS positions at their “right” locations on the polylines in the map.
Map matching is useful for a number of purposes. Map matching is used when a navigation system displays the vehicle’s location on a map. In many applications, information such as speed limits are assigned to the representations of roads in a digital map-map matching...
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