Center for Orbit Determination in Europe (CODE) 2002-2023 ionospheric TEC global map

The ionospheric TEC dataset is a global ionospheric GIM-TEC data generated in the standard Ionosphere map exchange format (IONEX) file format provided by the International GNSS Service (IGS).Since 19 October 2014, the time resolution of CODE-TEC data has changed from 2 h to 1 h. The longitude ranges from 180◦ west to 180◦east, andthe latitude ranges from 87.5◦south to 87.5◦ north. The spatial resolution is 5◦longitudeand 2.5◦latitude.The time range of the data set is from 1 January 2002 to 31 December 2023, and the data of each day constitutes a file. The time resolution of data from 1 January 2002 to 18 October 2014 has been changed to 1 h through interpolation. According to the information above, the scale of the grid points of the GIM is 71 × 73.In addition, we can combine the TEC map data of one day, which is 24 TEC maps, as the input of a single sample, and the output of the sample is the 24 TEC maps of the next day. Then, a five-dimensional tensor can be derived, and its dimensions are (number, 24, 71, 73, 1).