Short Name:

GPM GMI XCAL Common Calibrated Brightness Temperatures L1BASE 1.5 hours 13 km V05 (GPM_BASEGPMGMI_XCAL) at GES DISC

Version 5 is the current version of the data set. Version 4 is no longer available and has been superseded by Version 5. Consistent rainfall retrievals from each instrument mandate the basic sensor radiance measurements (brightness temperature, Tb) to be consistently inter-calibrated. Fundamental to this concept is the existence of the GPM Microwave Imager (GMI), a conically scanning multifrequency radiometer in non-sun-synchronous orbit, which will serve as a radiometric transfer standard for the other passive microwave sensors on cooperative (polar orbiting) constellation satellites. This GPM inter-satellite calibration process is known as XCAL. This GPM GMI product contains "GMI Antenna Temperatures", and is written as a multi-Swath Structure. Swath S1 has channels 1-9: 10V 10H 19V 19H 23V 37V 37H 89V 89H. Swath S2 has channels 10-13: 166V 166H 183+/-3V 183+/-8V. S3 S4 are full rotation versions of S1 S2. GMIBASEXCAL is like GMIBASE but has overlap of 200 scans on each end of S3 and S4.

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