Patent ID: 8725404
Filing Date: 2014-05-13
Classification: G01C,G09B

Abstract:
1. A method for updating a digital map using probe trace data received from probes wherein unreliable probe data is culled, said method comprising the steps of: providing a digital map having at least one road segment corresponding to a section of road in real life, the road segment having an altitude specification which is reliably known and indicative of the actual altitude of the corresponding road section in real life; receiving probe data from at least one probe matched to the road segment, the received data including or enabling derivation of altitude information; calculating a correspondence value between the known altitude specification of the road segment and the reported altitude information for the probe matched to the road segment; defining a correspondence threshold for the altitude specification; identifying the matched probe as reliable if the calculated correspondence value does not exceed the correspondence threshold, and classifying the matched probe as unreliable if the calculated correspondence value exceeds the correspondence threshold; accepting probe data received from a reliable probe while rejecting probe data received from an unreliable probe; and updating the digital map using probe data received from a reliable probe but not from an unreliable probe.