• "gps time utc": unix timestamp
• "timestr": time string in the format "%Y-%m-%d_%H:%M:%S" with UTC time zone (reformatted "gps time utc")
• "latitude", "longitude": gps coordinates
• "gps altitude (m)", "gps speed (m/s)", "gps course (deg)", "gps climb (m/min)": altitude, speed, bearing and climb rate
• "gps EPX Estimated * Error": gps estimated errors
• "Magnetic Bearing [deg.]", "Magnetic Tilt [deg.]": magnetic compass bearing and tilt
• "module", "sensor_azimuth", "sensor_zenith": side of the irradiance sensor ("module" attains values: "roof", "left", "right", "rear"). "sensor_azimuth" and "sensor_zenith" define orientation of the irradiance sensor. azimuth computed from magnetic compass, zenith 0 corresponds to the sky orientation
• "irradiance_Wm2": irradiance sensor irradiance and temperature readings
• "GHI", "DHI", "Clear sky GHI", "Clear sky DHI": copernicus irradiance values
• "geohash": region id which is used in training dataset split

The "train.csv.gz" contains the actual measurement data for the "irradiance_Wm2" field. The "submission_*.csv.gz" contains "GHI" values for the "irradiance_Wm2", which provides are very simple baseline model that ignores the topography.