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Global ionosphere Total Electron Content (TEC) grids are derived from Global Navigation Satellite System (GNSS) data. The dataset includes both predicted and rapid daily products, generated by International GNSS Service (IGS) analysis centers and combined by the IGS ionosphere analysis coordinator. These products are hosted by NASA's Crustal Dynamics Data Information System (CDDIS).
License is listed as 'other-license-specified' on Data.gov; users must investigate specific terms. Data files are in ISO and BIN formats.