PTV Group - Logistics Forum

Hello together,

today I've been asked for a specific solution for the following situation - see attached image:

• customer wants to compute time of arrival based on current GPS position and next destination coordinates
• due to GPS deviation a vehicles on board unit provides the blue location as the current position - we also know that the vehicles heading is 181 (dotted line)
• what happens is that the vehicle is matched into a low level dead end street (purple icon)
• what we want to have is the vehicle being matched to the highway in direction 181 (red circle)

We already played with the combination of standard properties coordinates, linking type and the non-standard heading (enabled in the profile, provided in the request) and this resolved another big issue but in this case we need a different approach.

Besides current (coordinates, heading) we also have access to a history of (coordinates, heading)... is there anybody who also tried to implement such a plot based on xRoute (and maybe xMapMatch)?

I need an ignition spark

Best regards Bernd

The proper way would be to feed the last few points of the track into xMapmatch and do a global matching. If this is doable and how big the trace needs to be depends on the quality of the signal.

Off coarse there is also the "shadey" way: install an extracted instead of detailed map. If there are no small roads in the map, the xRoute cannot link to them .

Hello Joost,

I think we have to evaluate the usage of xMapMatch because under some special conditions it is definetly necessary to link the GPS to the low level street - if the recent coordinates seem to belong to that kind of street after the map matching.

Using a poor map with high level streets is definetly not a valid approach, e.g. because the destinations of the users could also belong to low level streets and we need a precise routing.

Best regards and one more time "thanks for the input",

Bernd