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Tropical Rainfall Measuring Mission (TRMM) Rainfall Estimate L3 3 hour 0.25 degree x 0.25 degree (TRMM_3B42)

Update Frequency: Monthly
Latest Data Update: 2020-03-09
Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2018-09-10
Download Stats: last 12 months
Dataset Size: 252.24K Files | 52GB


This dataset contains output from the TMPA (TRMM Multi-satellite Precipitation) Algorithm, and provides precipitation estimates in the TRMM regions that have the (nearly-zero) bias of the ”TRMM Combined Instrument” precipitation estimate and the dense sampling of high-quality microwave data with fill-in using microwave-calibrated infrared estimates. The granule size is 3 hours.

The Tropical Rainfall Measuring Mission (TRMM) was a joint mission between NASA and the Japan Aerospace Exploration (JAXA) Agency to study rainfall for weather and climate research.

Citable as:  National Aeronautics and Space Administration (2018): Tropical Rainfall Measuring Mission (TRMM) Rainfall Estimate L3 3 hour 0.25 degree x 0.25 degree (TRMM_3B42). National Aeronautics and Space Administration, date of citation.
Abbreviation: Not defined
Keywords: TRMM, TMPA, rainfall, tropical


Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
Access rules:
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Use of these data is covered by the following licence: When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record.
Data lineage:

Data taken as is from National Aeronautics and Space Administration (NASA).

Data Quality:
Data is as given by the data provider, no quality control has been performed by the Centre for Environmental Data Analysis (CEDA)
File Format:
Data are HDF formatted

Process overview

This dataset was generated by the computation detailed below.

TRMM Multi-Satellite Precipitation Analysis


The Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis (TMPA) provides a calibration-based sequential scheme for combining precipitation estimates from multiple satellites, as well as gauge analyses where feasible, at fine scales (0.25° × 0.25° and 3 hourly). TMPA is available both after and in real time, based on calibration by the TRMM Combined Instrument and TRMM Microwave Imager precipitation products, respectively.

Input Description


Output Description


Software Reference


  • units: mm/hr
  • var_id: HQprecipitation
  • units: mm/hr
  • var_id: IRprecipitation
  • var_id: InputAlgorithmVersions
  • var_id: InputFileNames
  • var_id: InputGenerationDateTimes
  • units: mm/hr
  • var_id: precipitation
  • units: mm/hr
  • var_id: relativeError
  • units: minutes
  • var_id: satObservationTime
  • var_id: satPrecipitationSource

Co-ordinate Variables

Temporal Range
Start time:
End time:
Geographic Extent