Disclosed are map matching methods and system for tracking and determining an improved position of a reference asset. The method comprising: receiving at least one global navigation satellite system (GNSS) current position probe from the reference asset; requesting and receiving information from a geographical information system (GIS) unit on a plurality of probable road network segments on which the at least one GNSS current position probe is capable of being snapped; computing a weighted cost function for each of the probable road network segments; and snapping and information fusing the current position of the reference asset with a selected road network segment having the minimum weighted cost function out of the probable road network segments.