TRMM/PR L1 Reflectiveities

  • DOI: 10.57746/EO.01gs73b050eggckx0pwqk08thg
  • Last Updated: 2023-02-14
Data Progress: Complete
G-Portal

Product Summary

TRMM/PR L1 Reflectiveities is obtained from the PR sensor onboard TRMM and produced by the Japan Aerospace Exploration Agency (JAXA). The Precipitation Radar (PR) is the primary instrument onboard TRMM. The most innovative of the five TRMM instruments, the PR is the first quantitative rain radar instrument to be flown in space. The major objectives of the PR instrument are as follows:
a. Provides a 3-dimensional rainfall structure
b. Achieves quantitative measurements of the rain rates over both land and ocean
When properly combined with TMI measurements, the Precipitation Radar (PR) data is instrumental in obtaining the height profile of the precipitation content, from which the profile of latent heat release from the Earth can be estimated. The rain rate is estimated from the radar reflectivity factor when the rain rate is small by applying conventional algorithms used for ground-based radar. For large rain rates, a rain attenuation correction is made using the total-path attenuation of land or sea surface echoes.
In PR Level 1 processing, Level 0 transmitted from NASA data is checked whether it is in an observation mode, and then three types of products are processed which are 1A21, 1B21, and 1C21. Moreover received power, noise level, Z factor including rain attenuation is calculated. However, 1A21 is actually processed within a same routine as 1B21, so 1A21 itself is not singly output.
In 1C21 processing, the dummy radar reflectivity factor (Z factor: Zm) including rain attenuation during a rainfall is calculated using the radar equation, from the already calibrated received power value and noise level value calculated in the 1B21 processing.
The provided format is HDF4. The Sampling resolution are 5km (horizontal) and 250m (range). The current version of the product is Version 7. The generation unit is orbit.

Platform
TRMM
Sensor
PR

Coverage

Temporal Coverage

1997-12-08 to 2015-04-02

Spatial Coverage

Bounding Rectangle
(40.0°, -180.0°, -40.0°, 180.0°)

Resolution

5 km

Location

  • GEOGRAPHIC REGION > TROPICS
Dataset Short Name
TRMM_PR_L1_1C21
Platform / Sensor
TRMM / PR
Coverage
Spatial Coverage
Bounding Rectangle
(40.0°, -180.0°, -40.0°, 180.0°)
Temporal Coverage
1997-12-08 to 2015-04-02
Product Level ID
L1
Version Description

Version 7, 2018-07-30, Available

File Format
HDF4
Dataset Type
None / Orbit
Resolution
Spatial Resolution
5 km
Temporal Resolution
None
Dataset Progress
Complete
Projection
None
Collection Data Type
SCIENCE_QUALITY
Get Data
https://gportal.jaxa.jp/gpr/?lang=en
Dataset Title
TRMM/PR L1 Reflectiveities
Distribution Format
HDF4
Fees
Free
Citation
Japan Aerospace Exploration Agency. 1997. TRMM/PR L1 Reflectiveities. https://doi.org/10.57746/EO.01gs73b050eggckx0pwqk08thg
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Use Constraints

The user is entitled to use G-Portal data free of charge without any restrictions (including commercial use) except for the condition about acknowledgement of data credit as stipulated in G-portal terms of use 7.(2).Click here for detailed G-Portal data usage constrains.

G-Portal Terms of service
https://gportal.jaxa.jp/gpr/index/eula?lang=en
ISO Topic Categories
  • CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
Science Keywords
  • EARTH SCIENCE > SPECTRAL/ENGINEERING > RADAR > RADAR REFLECTIVITY
Location Keywords
  • GEOGRAPHIC REGION > TROPICS

ISO Topic Categories is the keywords in the ISO 19115 - Geographic Information Metadata.

Science Keywords hosts Global Change Master Directory (GCMD) Keywords which are a hierarchical set of controlled Earth Science vocabularies that help ensure Earth science data, services, and variables are described in a consistent and comprehensive manner and allow for the precise searching of metadata and subsequent retrieval of data, services, and variables.