Re: [OSRM-talk] Strange results from map matching
Hi, On 13.05.20 23:14, Sasan Amini wrote: > I am relatively new in using OSRM for map matching. I got my first > results but there are two issues that I can't understand. My data has > 130 rows (points) and in return, I get 150 points! I think you are approaching this with the wrong expectation. The map matching algorithm is not one that simply moves each of your input points onto the output geometry and therefore has one output for every input. Instead, the map matching algorithm tries to answer the question: What is a valid route on the routing graph that is most likely the basis of this input GPS track? This "most likely valid route" is then returned to you. It can have more or fewer points than the input geometry; in fact matching input geometry points to certain points on the output will be very difficult! Bye Frederik -- Frederik Ramm ## eMail frede...@remote.org ## N49°00'09" E008°23'33" ___ OSRM-talk mailing list OSRM-talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/osrm-talk
[OSRM-talk] Strange results from map matching
Dear all, I am relatively new in using OSRM for map matching. I got my first results but there are two issues that I can't understand. My data has 130 rows (points) and in return, I get 150 points! I see a couple of duplicates (some points are repeated 3 times after map matching). Additionally, 4 points are not map matched, even though it seems they are OK (screenshot below). The algorithm handles the part where GPS is lost (the car is driving in a tunnel) but 2 sets of 2 points are just not matched. Can anyone help me with that? Thanks, Sasan ___ OSRM-talk mailing list OSRM-talk@openstreetmap.org https://lists.openstreetmap.org/listinfo/osrm-talk
