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Full catalog/GPM_1CTRMMTMI
GPM_1CTRMMTMI·v07·dataset

Raw microwave brightness readings (TRMM TMI)

GPM TMI on TRMM Common Calibrated Brightness Temperatures L1C 1.5 hours 13 km V07 (GPM_1CTRMMTMI) at GES DISC
atmosphere NASA GES_DISC Level 1
In plain English

What it measures. Raw microwave brightness readings, in effect how much natural microwave energy different surfaces and clouds emit at several frequencies, along with timing, location, and viewing angles for each scan.

How it's made. Recorded by the TMI microwave instrument on the TRMM satellite and recalibrated into a standardized format so it lines up consistently with similar sensors.

How & where you'd use it. A building-block input used mainly to derive rainfall and other weather products; most people encounter it through those higher-level products rather than directly.

What's measured

ATMOSPHERE › ATMOSPHERIC WATER VAPORATMOSPHERE › PRECIPITATIONSPECTRAL/ENGINEERING › MICROWAVE › BRIGHTNESS TEMPERATURE

Coverage & cadence

  • Time span1997-12-07 → 2015-04-08
  • Measured byTRMM (TMI)
  • Processing levelLevel 1
  • Spatial extent-180, -39, 180, 39
  • StatusCOMPLETE

What you can do with it

  • Map air pollutants — NO₂, aerosols, ozone
  • Track greenhouse gases and Earth's energy budget
  • Feed weather and air-quality analysis
Official description

This a new (GPM-formated) TRMM product. There is no equivalent in the old TRMM suite of products. All 1C products have a common L1C data structure, simple and generic. Each L1C swath includes scan time, latitude and longitude, scan status, quality, incidence angle, Sun glint angle, and the intercalibrated brightness temperature (Tc). One or more swaths are included in a product. The radiometer data are recalibrated to a common basis so that precipitation products derived from them are consistent. 1CSSMIS contains common calibrated brightness temperature from the SSMIS passive microwave instruments flown on the DMSP satellites. Swath S1 has 3 low frequency channels (19V 19H 22V). Swath S2 has 2 low frequency channels (37V 37H). Swath S3 has 4 high frequency channels (150H 183+/-1H 183+/-3H 183+/-7H). S4 has 2 high frequency channels (91V 91H). All the above frequencies are in GHz. Earth observations for all four swaths are taken during a 144o segment of the instrument rotation when SSMIS scans in the direction of foreward satellite motion. We define the spacecraft vector (v) at the center of this segment.

Get the data

gpm_1ctrmmtmi_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="GPM_1CTRMMTMI",
    version="07",
    bounding_box=(-122.5, 37.2, -121.8, 37.9),  # your area (W,S,E,N)
    temporal=("2024-01-01", "2024-12-31"),       # your dates
)
files = earthaccess.open(results)   # stream straight from GES_DISC
Browsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.