Near Real-Time TEC Maps, Global (beta)

Latest Data

Latest Data

Product Description

Product Description

DLR's global total electron content (TEC) maps provide information about vertical TEC (VTEC) at a shell-height of 400 km. The provided product is a new version of the SWACI near real-time TEC Map. The new beta version product uses a new processing chain. The product is provided for test purposes without validation.

Input GPS data is acquired from different providers in real-time via the German Federal Agency for Cartography and Geodesy in Frankfurt. This data is preprocessed in order to derive calibrated slant TEC (STEC) and to update the coefficients of the Neustrelitz Total Electron Content Model (NTCM) serving as ionospheric background. Subsequently the calibrated STEC measurements are assimilated into NTCM, cf. (Jakowski et al., 2011). Every 15 minutes a VTEC matrix with an ionospheric grid point spacing of 2.5° latitude x 5° longitude is generated and stored in JSON format. The usage of this product intends to help to improve the accuracy during GNSS positioning. The quality of the TEC map depends on the errors of the GNSS measurements. These errors are monitored through the production pipeline and displayed in a TEC error map. This TEC error map is provided as quality information along with the product.

The TEC is provided in TEC units (10^16 electrons per square meter).

Jakowski, N., C. Mayer, M. M. Hoque, and V. Wilken (2011), Total electron content models and their use in ionosphere monitoring, Radio Sci., 46, RS0D18, doi:10.1029/2010RS004620.

Product Specification

Specification Description
External parties German Federal Agency for Cartography and Geodesy, data providers below
Data providers IGS, Greenland network of the Technical University of Denmark
Input data  GPS dual-frequency measurements
Input sampling rates  1 s
Reliability of data source  Data is preprocessed by DLR including e.g. cycle slip detection
Region of sensors  Global
Sensors The GNSS stations used for the computation of the maps are described in the product file
Single layer shell height 400 km
Spatial Resolution 2.5° Latitude x 5° Longitude
Boundaries of grid 90°S - 90°N, 180°W - 180°E
Temporal Resolution 15 min
Time Information UTC Time
Reference coordinate System ECEF coordinate system with WGS84 reference ellipsoid
Algorithms 24 hours weighted least-squares estimate of DCBs, background model coefficients; 5 min updates of DCBs and background model coefficients in linear recursive filter; previous estimates serve as background for the assimilation of estimated calibrated STEC into the update background model by means of a successive correction method (cf. onlinelibrary.wiley.com/doi/10.1029/2010RS004620/abstract).
File format JSON

 

 

Quality Information

Quality Information

  • Error of the NRT TEC map, global, derived from errors of the GNSS measurements.

Archive

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[PARENTDIR]Parent Directory  -  
[DIR]2021/2023-01-02 01:44 -  
[DIR]latest/2024-07-13 01:33 -  
[quicklook]IMPC-thumbnail_TEC-GB-NC.png2024-07-18 05:00 27Kquicklook