Sensorvault is an internal

Google Google LLC () is an American multinational technology company focusing on search engine technology, online advertising, cloud computing, computer software, quantum computing, e-commerce, artificial intelligence, and consumer electronics. ...

database that contains records of users' historical geo-location data. It has been used by law enforcement to execute a

geo-fence warrant A geo-fence warrant (also known as a geofence warrant or a reverse location warrant) is a search warrant issued by a court to allow law enforcement to search a database to find all active mobile devices within a particular geo-fence area. Courts ha ...

and to search for all devices within the vicinity of a crime, (within a geo-fenced area) and after looking at those devices' movements and narrowing those devices down to potential suspects or witnesses, then asking Google for the information about the owners of those devices.

References

Internet privacy Google Geographical databases {{Google-stub