This document introduces you to the key mapping concepts used by HERE. Most of these concepts are used throughout the global mapping industry. Understanding these concepts is essential for working with HERE maps in nearly any capacity.

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Term Definition
API keys Simple and secure credentials for using your application with HERE APIs.
ASN.1 Formal notation used for describing data transmitted by telecommunications protocols like LPP.
Assistance data Navigation models and other data (for example, ionospheric model) that aids the calculation of GNSS position in device.
Beidou Global navigation satellite system operated by China.
BER Basic Encoding Rules, a self-describing and self-delimiting format for encoding ASN.1 data structures.
Correction data Data that helps position GNSS receivers more accurately.
GALILEO Global navigation satellite system created by the European Union.
Geolocation A specific location on the surface of the earth, typically expressed in latitude, longitude, and elevation relative to mean sea level.
GLONASS Global navigation satellite system operated by Russia.
GNSS Global Navigational Satellite System. An umbrella for all satellite systems like GPS, GLONASS, GALILEO, Beidou, and QZSS.
GPS Global Positioning System owned by the United States.
LPP 3GPP defined LTE Positioning Protocol.
Navigation model Ephemeris (orbit) data and clock model for a satellite.
NDS Navigation Data Standard, which is a standardized format for automotive-grade navigation databases, jointly developed by automobile manufacturers and suppliers.
OAuth Open Authorization framework. Industry-standard protocol for authorization.
PE Position Engine, client software running the position algorithms.
PPP Precise Point Positioning, a positioning technique behind HD-GNSS product utilizing SSR correction data.
Protobuf Protocol Buffer is a free and open-source cross-platform data format used to serialize structured data, including map data.
QZSS Quasi-Zenith Satellite System. Regional navigation satellite system comissioned by Japan.
SSR State Space Representation. Correction data that models major errors over large areas.
Tessellation In computer graphics, tesselation is the process of converting surfaces to polygons, and curves to polylines, for the purpose of rendering on a screen.
TTFF Time to first fix. The time required for a GPS navigation device to acquire satellite signals and navigation data and calculate a position.
Vector A ray (i.e. a half-line) with a specific starting point, length, and direction.
WebSocket Computer communications protocol providing full-duplex communication channels over a single TCP connection.

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