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Plausibility checks for the reconstruction of routes and the analysis of junction and turn-off situations ensure reliable results. Local matching: Try to match one single GPS position on the digital map without considering the previous detected positions.ĭuring the matching, driving restrictions are also included such as tunnels, one-way streets, pedestrian areas etc.Doing this, inaccuracies of the incoming locations are relieved and more precise positions are identified to reference the actually used road segment. The PTV xMapmatch Server is building a history of previously determined positions on the street segments and is trying to predict the next street segment where a newly detected position might be occur in consideration of the previous detected locations. GPS positions may not be accurate and in particular, the reference to the corresponding street segment is not known on the existing digital map. Global matching: Tries to reconstruct the possible driven route by using the already recorded GPS positions.
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You can choose between two calculation modes: It is not guaranteed that he find the exact route. Due to this reason PTV xMapmatch tries to find the possible driven route. Under sub-optimal conditions the detected position may differ from the actual position by 100 meter or more. A GPS position for civil usage for example only allows an accuracy of 15 meter. For example environmental influences or the method of position detection by the device itself. The accuracy of the positions detected by a device varies depending on several conditions. The geographic locations, which are used as input of the PTV xMapmatch Server, usually are provided by a GPS receiver or a combination of sensors which allow the determination of an approximated position. Using the PTV xMapmatch Server, it is possible to determine on which street a car currently is most probably located. It detects the possible driven route in dependency of the frequency of received GPS signals.
Gps tracks vs routes how to#
Use Cases > PTV xMapmatch > How to Reconstruct a Route From GPS Tracks How to Reconstruct a Route From a GPS Track