GPM TMI on TRMM Brightness Temperatures L1B 1.5 hours 13 km V08 (GPM_1BTMI) at GES DISC

This is the new (GPM-formated) TRMM product. It replaces the old TRMM_1B11

Version 08 is the current version of the data set. Previous versions have been superseded by Version 08.

This dataset contains TRMM Micrwave Imager (TMI) L1B calibrated radiances in terms of Brightness Temperatures.

The TMI calibration algorithm (1B11) converts the radiometer counts to antenna temperatures by applying a linear relationship of the form Ta = c1 + c2 x count. The coefficients are provided by the instrument contractor. Antenna temperatures are corrected for cross-polarization and spill over to produce brightness temperatures (Tb), but no antenna beam pattern correction or sample to pixel averaging are performed. Temperatures are provided at 104 scan positions for the low frequency channels and 208 scan positions at 85 GHz. There are four samples per pixel (3 -dB beamwidth) at 10 GHz, two samples at 19, 22, and 37 GHz, and one sample per pixel for the 85 GHz. Data Flow Description

Changes in horizontal resolution resulting from the TRMM boost that occurred on 24 August 2001:

Pre-Boost (before 7 August 2001): Temporal Resolution: 91.5 min/orbit ~ 16 orbits/day; Swath Width: 760 km; Horizontal Resolution: ~13 km

Post-Boost (after 24 August 2001): Temporal Resolution: 92.5 min/orbit ~ 16 orbits/day; Swath Width: 878 km; Horizontal Resolution: ~13 km

Data and Resources

Additional Info

Field Value
Maintainer Earthdata Forum
Last Updated June 23, 2026, 02:50 (UTC)
Created June 2, 2026, 21:12 (UTC)
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id c9970dd8-7c00-4a12-b2b1-c4204a00ba9b
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
identifier 10.5067/GPM/TMI/TRMM/1B/08
license https://www.usa.gov/government-works
modified 2026-06-15T22:16:02Z
programCode {026:000}
publisher NASA/GSFC/SED/ESD/TISL/GESDISC
resource-type Dataset
source_datajson_identifier true
source_hash a48ecffc8d1aeebe850cbb374559b315803639c920c344cfce1f9b160818933d
source_schema_version 1.1
spatial ["GEODETIC", [{"WestBoundingCoordinate": -180, "NorthBoundingCoordinate": 38, "EastBoundingCoordinate": 180, "SouthBoundingCoordinate": -38}]]
temporal 1997-12-07/2015-04-08
theme {"Earth Science"}