Don’t hesitate to contact us:
A map matching software makes your recorded GPS points ‘snap’ to some digital road network. E.g. the open source map matching component from GraphHopper is a highly customizable solution also available as SaaS. The following picture illustrates this map matching process from recorded data (blue) to matching data (green):
But why is this ‘snap to road’ useful? For that we will look today into three possible usage scenarios. Before we start we need to clarify the wording a bit. A GPS point is a location on earth with latitude and longitude data, and a GPX point is a GPS point with an associated timestamp. So when you record your walking or biking trail you often have a GPX file which is a list of GPX points.
The Google Maps Roads API allows you to make GPX tracks align to their proprietary road network, which is useful. They also allow you to attach the maximum allowed speed but no further information and only for business customers. A solution like a map matching component from GraphHopper which is based on OpenStreetMap has some advantages over that:
If you track vehicles the data will suffer from GPS device precision errors, which also means that the speed and location is not that exact. Having more precise road network data and use this to enhance your recorded data will help you to calculate more precise distance and speed values for your tracked vehicles.
Once you have recorded the GPX tracks and transformed them into digital paths you know the road IDs. With that information you can easily detect if two vehicles are passing the same road although the GPS coordinates are completely different and just ‘similar’ in location. This makes it easier to assign values like the measured speed to a road. Also this data can be used for traffic influenced routing.
Furthermore an open source solution makes it easy to