GNSS TEC, GIS and tomography data

The data uploaded includes GPS and GLONASS vTEC, latitude, longitude and elevation angle for 10, 11 and 12 January 2024. The TEC is 30-seconds sampled data from 0430 UT to 0730 UT. The data is in 3-dimensions, with first dimension for the number of stations, second dimension for number of epochs (361), and third dimension for number of satellites (32 for GPS and 26 for GLONASS). There are three separate mat files with names gnss_tec_YYYYMMDD.mat for 2024 January 10-12. The variables are named as 'GPSvtec', 'GPSlat', 'GPSlon', 'GPSelev' for GPS data and 'GLOvtec', 'GLOlat', 'GLOlon', 'GLOelev' for GLONASS. The UT epoch is included as "time'.The GIS electron density used for Figure 8 is uploaded in the file gis_tomography_data.mat. The data are stored in the variables "GIS_Ne_YYYY_DOY_hhmmUT_longitude' for both the panels plotted. The altitude and latitude values are included as 'GIS_altitude' and 'GIS_latutude'. The file also includes the tomography data used in figures 8 and 13. The variables names are 'tomo_Ne_YYYY_DOY_hhmmUT_longitude', 'tomo_Ne_YYYY_DOY_hhmmUT_altitude', 'tomo_altitude', and 'tomo_latitude', and 'tomo_longitude'.

本次上传的数据包含2024年1月10、11、12日的GPS与GLONASS垂直总电子含量（vertical Total Electron Content, vTEC）、纬度、经度及仰角数据。其中总电子含量（TEC）数据的采样间隔为30秒，采样时段为世界时（Universal Time, UT）0430至0730。该数据集为三维结构：第一维度为测站数量，第二维度为历元数（共361个），第三维度为卫星数量（GPS对应32颗，GLONASS对应26颗）。本次提供了三个独立的MATLAB数据文件，命名格式为gnss_tec_YYYYMMDD.mat，分别对应2024年1月10日至12日的观测数据。相关变量命名规则如下：GPS数据对应的变量为'GPSvtec'、'GPSlat'、'GPSlon'、'GPSelev'；GLONASS数据对应的变量为'GLOvtec'、'GLOlat'、'GLOlon'、'GLOelev'。数据中还包含世界时历元信息，存储为变量"time"。用于绘制图8的GIS电子密度数据已上传至文件gis_tomography_data.mat中，该数据以变量"GIS_Ne_YYYY_DOY_hhmmUT_longitude"存储，适用于所有子图。该文件同时包含'GIS_altitude'与'GIS_latutude'两个变量，分别存储海拔与纬度信息。此外该文件还包含用于绘制图8和图13的层析成像数据，相关变量包括'tomo_Ne_YYYY_DOY_hhmmUT_longitude'、'tomo_Ne_YYYY_DOY_hhmmUT_altitude'、'tomo_altitude'、'tomo_latitude'以及'tomo_longitude'。