Skyhook's Location Platform provides precision positioning at a global scale using a variety of data sources. It collects sensor data from over 1 billion points including WiFi access points and cell towers across more than 200 countries. This data covers over 850 million people and results in many billions of location transactions per month. Skyhook fuses data from proprietary scanning devices, consumer devices, and third-party sources. It applies techniques such as detecting pathological data, characterizing source quality, and building algorithms to handle variable quality data. The system also continuously reviews and refreshes its data and algorithms to account for changes over time.