This a new (GPM-formated) TRMM product. There is no equivalent in the old TRMM suite of products.

The BASETRMMTMI product contains unaltered data directly from the TRMM Microwave Imager (TMI) aboard the TRMM satellite.

It has has two purposes: To repackage the raw satellite data from binary Consultative Committee for Space Data Systems (CCSDS) packets to Hierarchical Data Format (HDF5), and to geolocate the sample data. The counts in the product are the raw counts taken directly from the packets created by the TRMM Microwave Imager (TMI) instrument. There is no calibration or interpretation performed at the BASETRMMTMI level.