Introduction

The HERE GNSS Data API is an HTTP REST API that provides real-time Assisted GNSS (A-GNSS) data
and predicted GNSS navigation models
to improve the performance of GNSS receivers. The HERE GNSS Data API makes it possible to:

• Shorten the time needed to get the first GNSS-based position estimate (TTFF).
• Achieve continuous position tracking with much weaker signal levels.
• Reduce power consumption by reducing the time it takes to calculate the current position.
• Enable fast TTFF even when the device has no network connectivity,
  by using pre-downloaded predicted navigation models.

The HERE GNSS Data API provides data for the following satellite systems:

• GPS (Global Positioning System)
• GLONASS (Global Navigation Satellite System)
• Galileo (Galileo Navigation Satellite System)
• BeiDou (BeiDou Navigation Satellite System)
• QZSS (Quasi-Zenith Satellite System) — real-time A-GNSS only

The data is returned in the standard LPP ASN.1 format as defined by the
3GPP LTE Positioning Protocol (LPP) specification.
LPP messages can be encoded using UPER (Unaligned Packed Encoding Rules)
or JER (JSON Encoding Rules).

Note

Using this API requires familiarity with GNSS positioning technologies.

The HERE GNSS Data API supports the following use cases:

• Real-time A-GNSS data: GNSS assistance data is used to shorten the time needed to get
  the first GNSS-based position estimate. The data is provided to the GNSS positioning engine
  of the client device. The positioning engine uses this data together with the raw GNSS
  measurements received by the device's GNSS receiver.
• Predicted GNSS navigation models: Predicted navigation models allow devices to achieve
  fast TTFF even without a network connection. The device downloads predictions in advance
  and uses the appropriate navigation models when positioning is needed.

Note

The HERE GNSS Data API is not included in the HERE Base Plan.

Contact us for free trials / pricing.

For information on:

• How to quickly set up and start using the HERE GNSS Data API,
  see Get started.
• Real-time A-GNSS data, see GNSS assistance data.
• Predicted navigation models, see Predicted GNSS data.
• The terms and conditions covering this documentation, see the HERE Documentation License.

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