GPM PR and TMI on TRMM (Combined Precipitation) L3 1 day 0.25x0.25 degree V07 (GPM_3CMB_TRMM_DAY) at GES DISC
This a new (GPM-formated) TRMM product. There is no equivalent in the old TRMM suite of products.

This is the GPM-like formatted TRMM Combined Precipitation (TRMM Ku radar and microwave radiometer/imager), first released with the "V8" TRMM reprocessing. 
Gombined Radar-Radiometer Algorithm performs two basic …