Cell ID
Cell IDs

Cell ID describes both a globally unique identifier for any logical cell network, as well as an approach to locate devices based on prior knowledge of the positions of these cell networks. Sometimes the term cell global identity (CGI) can also be found. See also WPS.


A term describing the GSM or WCDMA cell id, LTE cell identity, or CDMA base station id. All these form the last part of the globally unique Cell ID.

decimal degree
decimal degrees

Decimal degrees express latitude and longitude coordinates as decimal fractions. For example, 10.1234567.


The Mozilla Location Service is an instance of the Ichnaea software hosted by Mozilla.


An observation describes the data collected about a single station identified by its unique global identifier, additional data about the station like signal strength readings, and report data about the position of the station.


OpenCellID is a collaborative project to create a free worldwide database of Cell IDs.


A report describes the data collected in a single reading consisting of data about the position and movement at the time of taking the reading and data about multiple stations observable at the time. For example, one report could contain information about one cell network and 10 WiFi networks.


A term referring to any radio signal emitting stationary device or the radio network it emits. Examples of what we call stations are WiFi access points / WiFi network, cell towers / cell networks, and Bluetooth Beacons / Bluetooth LE networks.

Web Mercator

WSG 84 Web Mercator refers to the geographic map projection used throughout this project. The latitude and longitude values use WSG 84 as the coordinate reference system.


Wi-Fi based positioning system describes a system of using prior knowledge about the location of WiFi networks, identified by their globally unique BSSID/MAC address, to position devices. See also Cell ID.