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TRMM Microwave Imager Calibrated Radiances L1B 1.5 hours V7 (TRMM_1B11)

Published by NASA/GSFC/SED/ESD/TISL/GESDISC | National Aeronautics and Space Administration | Catalog Last Checked: September 08, 2026 at 11:51 PM | Dataset Last Updated: September 08, 2026
The new version of these data is in GPM-like format (consistent with the GPM Microwave Imager data format), and can be found under the name GPM_1BTMI (search by keyword GPM_1BTMI). 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: 4.4 km Post-Boost (after 24 August 2001): Temporal Resolution: 92.5 min/orbit ~ 16 orbits/day; Swath Width: 878 km; Horizontal Resolution: 5.1 km

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Complete Metadata
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accessLevel public
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description The new version of these data is in GPM-like format (consistent with the GPM Microwave Imager data format), and can be found under the name GPM_1BTMI (search by keyword GPM_1BTMI). 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: 4.4 km Post-Boost (after 24 August 2001): Temporal Resolution: 92.5 min/orbit ~ 16 orbits/day; Swath Width: 878 km; Horizontal Resolution: 5.1 km
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identifier 10.5067/JKGIKFMPYFC9
keyword 
[
  "earth-science-infrared-wavelengths-spectral-engineering-infrared-imagery",
  "earth-science-infrared-wavelengths-spectral-engineering-infrared-radiance",
  "earth-science-infrared-wavelengths-spectral-engineering-sensor-counts",
  "earth-science-infrared-wavelengths-spectral-engineering-thermal-infrared",
  "earth-science-platform-characteristics-spectral-engineering-attitude-characteristics",
  "earth-science-sensor-characteristics-spectral-engineering-viewing-geometry",
  "earth-science-visible-wavelengths-spectral-engineering-sensor-counts",
  "earth-science-visible-wavelengths-spectral-engineering-visible-imagery",
  "earth-science-visible-wavelengths-spectral-engineering-visible-radiance"
]
license https://www.usa.gov/government-works
modified 2026-09-08
programCode 
[
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publisher 
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spatial 
"["CARTESIAN", [{"WestBoundingCoordinate": -180, "NorthBoundingCoordinate": 38, "EastBoundingCoordinate": 180, "SouthBoundingCoordinate": -38}]]"
temporal 1997-12-07/2015-04-08
theme 
[
  "Earth Science"
]
title TRMM Microwave Imager Calibrated Radiances L1B 1.5 hours V7 (TRMM_1B11)

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