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Description

This derived product set consists of Global Navigation Satellite System Ionosphere Vertical Total Electron Content (VTEC) comparison product (daily files) from the NASA Crustal Dynamics Data Information System (CDDIS). GNSS provide autonomous geo-spatial positioning with global coverage. GNSS data sets from ground receivers at the CDDIS consist primarily of the data from the U.S. Global Positioning System (GPS) and the Russian GLObal NAvigation Satellite System (GLONASS). Since 2011, the CDDIS GNSS archive includes data from other GNSS (Europe’s Galileo, China’s Beidou, Japan’s Quasi-Zenith Satellite System/QZSS, the Indian Regional Navigation Satellite System/IRNSS, and worldwide Satellite Based Augmentation Systems/SBASs), which are similar to the U.S. GPS in terms of the satellite constellation, orbits, and signal structure. GNSS observations from a global network can be utilized for atmospheric measurements. Analysis Centers (ACs) of the International GNSS Service (IGS) retrieve GNSS data on regular schedules to produce independently computed VTEC maps. The IGS Ionosphere Analysis Center Coordinator (ACC) uses these individual AC solutions to generate the official IGS VTEC maps. The comparison product is used to compare the IGS and AC solutions of generated VTEC maps.

Product Summary

Platforms
Beidou,
GLONASS,
GPS,
GROUND STATIONS,
Galileo,
IRNSS,
QZSS,
SBAS
Instruments
Beidou P,
GLONASS P,
GNSS,
GPSP,
Galileo P,
IRNSS P,
QZSS P,
SBAS P
Spatial Extent
N: 90 S: -90 E: 180 W: -180
Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
1998-01-01 to Present
Data Partner
Crustal Dynamics Data Information System, Geodesy and Geophysics Laboratory, Earth Sciences Division, Sciences and Exploration Directorate, Goddard Space Flight Center, NASA (CDDIS)
Concept ID
c1511778657-cddis
Data State
ACTIVE
Processing Level
2
Published

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

International GNSS Service (IGS). (1998). GNSS Daily Ionosphere Total Electron Content Comparison Data Product [Data set]. NASA Crustal Dynamics Data Information System. https://doi.org/10.5067/GNSS/GNSS_IGSIONODCTEC_001 Date Accessed: 2025-06-23

Additional Citation

International GNSS Service, GNSS Daily Ionosphere Total Electron Content Comparison Data Product, Greenbelt, MD, USA: NASA Crustal Dynamics Data Information System (CDDIS), Accessed [[enter user data access date]] at doi:10.5067/GNSS/gnss_igsionodctec_001

File Naming Convention

The CODE Klobuchar model (specifically a Klobuchar-style model best fitting the CODE final IONEX): YYYY/DDD/topex/ckmgDDD0.YYi.Z The GPS broadcast ionosphere model (Klobuchar model, represented by 4+4 coefficients) provided as IONEX (generated at CODE): YYYY/DDD/topex/gpsgDDD0.YYi.Z

Documents

GENERAL DOCUMENTATION URL for more information about GNSS derived products

Learning Resources

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