Google improves positioning quality in urban canyons
The quality of GNSS positioning depends on direct view to GNSS satellites. In urban canyons are reflected by large structures and the direct line of sight to satellites is often obstructed. In combination with its 3D feature of Google maps these obstructions may be detected and the excessive travel path for signals is calculable.
Google has already a first version available. The main application is for locating pedestrians in urban canyons. The target is to reduce the placement of pedestrain position on the wrong side of streets. There are claims that the positioning with the first version is already 50% correct. With a roll-out of an updated second version the street side is detected correctly at a 75% rate.
Currently the feature is for pedestrians only, but future version may also allow improved positioning for other urban GNSS applications.