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- Info
Readme for TRMM Product 3B42 (V6)
Data Access for
TRMM and Other GPCP Calibration Rainfall Product 3B42: http://mirador.gsfc.nasa.gov/cgi-bin/mirador/presentNavigation.pl?tree=project&project=TRMM&dataGroup=Gridded&dataset=3B42:%203Hour%200.25%20x%200.25%20degree%20merged%20TRMM%20and%20other%20satellite%20estimates&version=006
Contents of TRMM and Other GPCP Calibration Rainfall Product 3B42 This document provides basic information on 3B42, TRMM and Other Satellites Rainfall Product.The combined instrument rain calibration algorithm (3B-42) uses an optimal combination of 2B-31, 2A-12, SSMI, AMSR and AMSU precipitation estimates (referred to as HQ), to adjust IR estimates from geostationary IR observations. Near-global estimates are made by calibrating the IR brightness temperatures to the HQ estimates. The 3B-42 estimates are scaled to match the monthly rain gauge analyses used in 3B-43.The output is rainfall for 0.25x0.25 degree grid boxes every 3 hours. For more details of the algorithm, go to http://trmm.gsfc.nasa.gov/3b42.html The data flow of 3B42 and the rest of the products are shown in Satellite Algorithm Flow Diagram. Data Characteristics
| TRMM 3B42 Characteristics | | Temporal Coverage | Start Date: 1998-01-01; Stop Date: - | | Geographic Coverage | Latitude: 50°S - 50°N; Longitude:180°W - 180°E | | Temporal Resolution | 3-Hourly | | Horizontal Resolution | 0.25° x 0.25°; nlat = 400, nlon = 1440 | | Average File Size | Compressed: ~285 KB; Original: ~4.5 MB | | File Type | HDF | Data Format Structure Further information on the contents and structure of the TMI rain profile (2A-12) product can be found in Volume 4 of the "File Specifications for PPS Products - Level 2 and Level 3" . | Data Format Structure for 3B42, TMI Profiling | | Name | Type | Record
Size
(byte) | Dim Size/
# of Records | Scaled
by | Range | Unit | Description | | ECS Core Metadata | Char Attribute | 10,000 | - | - | - | - | ECS Core Metadata | | PS Metadata | Char Attribute | 10,000 | - | - | - | - | Product Specific Metadata | | Grid Structure | Char Attribute | 5,000 | - | - | - | - | The specification of the grid geometry | | Precipitation | Float SDS | 4 | nlat*nlon | - | 0.0 - 100 | mm hr-1 | Adjusted GPCP precipitation estimate | | Relative Error | Float SDS | 4 | nlat*nlon | - | 0.0 - 100 | mm hr-1 | Adjusted GPCP relative error estimate |
Note: nlat = 400: number of 0.25° latitude grids from 50°S - 50°N;
nlon = 1440: number of 0.25° longitude grids from 180°W - 180°E;
Missing data are given the value of -9999.
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Atmos Composition
