A simple, linear GPS interpolation of measurement data is often error-prone, especially in tunnel areas, because individual data points, even if they deviate strongly, are still used for interpolation.
Focus Infocom’s route mapping technology extends this standard GPS interpolation method and additionally allows tagging of data according to various criteria. This method goes beyond conventional map-matching methods by utilizing nonlocal contextual information.
With the new mapping method, interpolation is based on a database of geographical rail/road data in order to be able to map GPS coordinates and the associated measurement data to the corresponding track or road segments.
In addition, markers, e.g. for tunnels, that correspond to specifications in the data can be added to the data. This allows filtering the measurement data in post-processing by either including or excluding tunnel sections.
Additionally, each geo measurement point in the database includes the information to which railway or road and to which 100 meter segment on this line the point belongs to. Since the algorithm doesn’t simply map the point to the nearest segment but to the segment that has actually been used, this mapping method is highly accurate.