Version 08 is the current version of the data set. Older versions will no longer be available and have been superseded by Version 08.
All 1C products have a common L1C data structure, simple and generic. Each L1C swath includes scan time, latitude and longitude, scan status, quality, incidence angle, Sun glint angle, and the intercalibrated brightness temperature (Tc). One or more swaths are included in a product. The radiometer data are recalibrated to a common basis so that precipitation products derived from them are consistent. 1CGMI contains common calibrated brightness temperatures from the GMI passive microwave instrument flown on the GPM satellite. 1C-R GMI is a remapped version of 1CGMI which is explained at the end of this section. Swath S1 has 9 channels which are similar to TRMM TMI (10V 10H 19V 19H 23V 37V 37H 89V 89H). Swath S2 has 4 channels similar to AMSU-B (166V 166H 183+/-3V 183+/-8V). Data for both swaths is observed in the same revolution of the instrument.
GMI geometric footprints are: 12x13.4 km (10.65 GHz), 6.0x13.4 km (18.7 GHz), 6.0x13.4 km (23.8 GHz), 6.0x13.4 km (36.5 GHz), 3.0x13.4 km (89 GHz), 3.0x13.4 km (166.5 GHz), 3.0x13.4 km (183.31GHz). GPM Project cross-calibrates all channels at spatial sampling: 6x13 km (cross-track x along-track at forward bore sight).