Imaging · dataset · 2025
TRMM Precipitation Radar Power and Reflectivity L1B 1.5 hours V7 (TRMM_1B21) at GES DISC
Listed in Open NASA
The TRMM Precipitation Radar (PR), the first of its kind in space, is an electronically scanning radar, operating at 13.8 GHz that measures the 3-D rainfall distribution over both land and ocean, and defines the layer depth of the precipitation.
Description
The 1B21 calculates the received power at the PR receiver input point from the Level-0 count value which is linearly proportional to the logarithm of the PR receiver output power.
To convert the count value to the input power, extensive internal calibrations are applied, which are mainly based upon the system model, temperature dependence of model parameters and many temperature sensors attached at various locations of the PR. Periodically the input-output characteristics are measured using an internal calibration loop for the IF unit and later receiver stages. To make an absolute calibration, an Active Radar Calibrator (ARC) is placed at Kansai Branch of CRL and overall system gain of the PR is being measured every 2 months.
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Using the transfer function based on the above internal and external calibrations, the PR received power is obtained. Note that the value assumes that the signal follows the Rayleigh fading, so if the fading characteristics of a scatter is different, a small bias error may occur (within 1 or 2 dB). 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: 215 km; Horizontal Resolution: 4.3 km Post-Boost (after 24 August 2001): Temporal Resolution: 92.5 min/orbit ~ 16 orbits/day; Swath Width: 247 km; Horizontal Resolution: 5.0 km
Links
Get the data
- Get a related visualization docserver.gesdisc.eosdis.nasa.gov/public/project/Images/TRMM_1B21_7.png ↗
download · from open nasa gov
- This dataset's landing page disc.gsfc.nasa.gov/datacollection/TRMM_1B21_7.html ↗
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- Download this dataset through a directory map disc2.gesdisc.eosdis.nasa.gov/data/TRMM_L1/TRMM_1B21.7 ↗
download · from open nasa gov
- Use OPeNDAP to access the dataset's data disc2.gesdisc.eosdis.nasa.gov/opendap/TRMM_L1/TRMM_1B21.7 ↗
download · from open nasa gov
- Download this dataset through Earthdata Search search.earthdata.nasa.gov/search?q=TRMM_1B21 ↗
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- The dataset's project home page trmm.gsfc.nasa.gov ↗
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- View documentation related to this dataset pps.gsfc.nasa.gov/Documents/filespec.TRMM.V7.pdf ↗
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- View documentation related to this dataset pps.gsfc.nasa.gov/Documents/formatChangesV7.pdf ↗
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- View documentation related to this dataset eorc.jaxa.jp/TRMM/documents/PR_algorithm_product_information/pr_manual/PR_I… ↗
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- View this dataset's read me document disc2.gesdisc.eosdis.nasa.gov/data/TRMM_L1/TRMM_1B21/doc/README.TRMM_V7.pdf ↗
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- View documentation related to this dataset gpmweb2https.pps.eosdis.nasa.gov/tsdis/AB/docs/anomalous.html ↗
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Where it is published
- Open NASA dataset page data.nasa.gov/dataset/trmm-precipitation-radar-power-and-reflectivity-l1b-1-… ↗
landing page · from open nasa gov
Catalogue records · 1
- CKAN API data.nasa.gov/api/3/action/package_show?id=2bcbcf33-6c38-4da4-bd10-670603d30… ↗
metadata API · from open nasa gov
Topics
- From keywords
- Earth & Environmental Science · Engineering
Related
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| Open NASA | 2bcbcf33-6c38-4da4-bd10-670603d301c7 | 15 h ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].local:field:earth-environmental | mapping · open nasa gov | vocabulary-mapper@1.0.0 | keywords['earth-science'] |
| concepts[field].local:field:engineering | mapping · open nasa gov | connector:open_nasa_gov@1.0.0 | |
| created_date | source · open nasa gov | connector:open_nasa_gov@1.0.0 | |
| description | source · open nasa gov | connector:open_nasa_gov@1.0.0 | /notes |
| license_text | source · open nasa gov | connector:open_nasa_gov@1.0.0 | |
| publication_date | source · open nasa gov | connector:open_nasa_gov@1.0.0 | |
| title | source · open nasa gov | connector:open_nasa_gov@1.0.0 | /title |
| updated_date | source · open nasa gov | connector:open_nasa_gov@1.0.0 |