Explanation of Data Products
Precipitation data sets, referred to as "products", are available at a variety of levels which denote the amount of processing that data has been through. These range from the raw instrument data to precipitation model outputs which are mathematically derived using the raw data as an input. Below are the definitions for each level:
| Level 0 | Raw instrument data |
| Level 1A | Reconstructed, unprocessed instrument data at full resolution, time referenced, and annotated with ancillary information, including radiometric and geometric calibration coefficients and georeferencing parameters (i.e., platform ephemeris), computed and appended, but not applied, to Level 0 data. |
| Level 1B | Radiometrically corrected and geolocated Level 1A data that have been processed to sensor units. |
| Level 2 | Derived geophysical parameters at the same resolution and location as those of the Level 1 data. |
| Level 3 | Geophysical parameters that have been spatially and/or temporally resampled from Level 1 or Level 2 data. |
| Level 4 | Outputs or results from models using lower level data as inputs and, thus, not directly derived from the instruments. |
At present, TRMM has each of these data products available for public download, except for the Level 4 products. Once the GPM Core Observatory is launched, these products will contain data processed from the GPM Core Observatory as well as the TRMM satellite. The products currently available from TRMM are listed below, as both instrument and gridded products. Information on each of these products is available here.
| Product ID | Product Name |
|---|---|
| Orbital Products | |
| 1B01 | Visible and Infrared Radiance |
| 1B11 | Microwave Brightness Temperature (TMI) |
| 1B21 | Precipitaion Radar (PR) Power |
| 1C21 | Precipitation Radar (PR) Reflectivity |
| 2A12 | TMI Hydrometeor Profile |
| 2A21 | Precipitation Radar (PR) Surface Cross-Section |
| 2A23 | Precipitation Radar (PR) Rain Characteristics |
| 2A25 | Precipitation Radar (PR) Rainfall Rate and Profile |
| 2B31 | Combined Rainfall Profile (PR, TMI) |
| Gridded Products | |
| 3A11 | Monthly 5° x 5° Oceanic Rainfall |
| 3A12 | Monthly 0.5° x 0.5° mean 2A12, profile, and surface rainfall |
| 3A25 | Monthly 5° x 5° and .5° x .5° Spaceborne Radar Rainfall |
| 3A26 | Monthly 5° x 5° Surface Rain Total |
| 3B31 | Monthly 5° x 5° Combined Rainfall |
| 3A46 | Monthly 1° x 1° SSM/I Rain |
| 3B42 | 3-hour 0.25° x 0.25° TRMM and Other-GPI Calibration Rainfall |
| 3B43 | Monthly 0.25° x 0.25° TRMM and Other Sources Rainfall |
| CSH | Monthly 0.5° x 0.5° Convective & Stratiform Heating |