Imaging · dataset · 2025
TRMM Precipitation Radar Power and Reflectivity L1C 1.5 hours V7 (TRMM_1C21) 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 1C21 calculates the effective radar reflectivity factor at 13.8 GHz without any propagation loss (due to rain or any other atmospheric gas) correction (Zm). Therefore, the Zm value can be calculated just by applying a radar equation for volume scatter with PR system parameters.
The noise-equivalent Zm is about 21 dBZ. Through the subtraction of the system noise, the Zm value as small as 16 or 18 dBZ are still usable although the data quality is marginal. In 1C21, all echoes stored in 1B21 are converted to "dBZ" unit.
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This is not relevant for "non-rain" echo; however, this policy is adopted so that the 1B21 and 1C21 product format should be as close as possible except for the following points: - Radar quantity is Zm in dBZ unit instead of received power (dBm). - Data at echo-free range bins judged in 1B21 are replaced with a dummy value. 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_1C21_7.png ↗
download · from open nasa gov
- This dataset's landing page disc.gsfc.nasa.gov/datacollection/TRMM_1C21_7.html ↗
download · from open nasa gov
- Download this dataset through a directory map disc2.gesdisc.eosdis.nasa.gov/data/TRMM_L1/TRMM_1C21.7 ↗
download · from open nasa gov
- Use OPeNDAP to access the dataset's data disc2.gesdisc.eosdis.nasa.gov/opendap/TRMM_L1/TRMM_1C21.7 ↗
download · from open nasa gov
- Download this dataset through Earthdata Search search.earthdata.nasa.gov/search?q=TRMM_1C21 ↗
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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 ↗
download · from open nasa gov
- 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_1C21/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-l1c-1-… ↗
landing page · from open nasa gov
Catalogue records · 1
- CKAN API data.nasa.gov/api/3/action/package_show?id=1fbd3d18-b125-44e6-9357-8d6f52afd… ↗
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 | 1fbd3d18-b125-44e6-9357-8d6f52afd5bd | 16 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 |