The Level 1B algorithm and software transform Level 0 counts into geolocated and calibrated antenna temperatures (Ta) and brightness temperatures (Tb). Ta is obtained by utilizing the sensor radiometric calibration as well as various corrections based on after launch analyses. Tb is derived from Ta after antenna pattern correction (APC) and along scan corrections. Figure 1.16 describes the relationship between algorithm components and products (or output).

Processing Level
Dates Covered
December 1997 - April 2015 (TRMM), March 2014 - Present (GPM)
Data Simple Description
Brightness temperatures for GPM GMI, and TRMM TMI, PR and VIRS
Minimum Latency
20 minutes (near real-time); 6 hours (research)
Spatial Resolution
Varies by satellite and instrument channel
Current Algorithm Version
1B GES DISC JacobAdmin Wed, 04/24/2019
1B PPS Research JacobAdmin Wed, 04/24/2019
1B PPS Near Real-time JacobAdmin Wed, 04/24/2019