Daily TRMM and Others Rainfall Estimate (3B42 V6 derived)Entry ID: TRMM_3B42_daily
Abstract: The Tropical Rainfall Measuring Mission (TRMM) is a joint U.S.-Japan
satellite mission to monitor tropical and subtropical precipitation
and to estimate its associated latent heating. TRMM was successfully
launched on November 27, at 4:27 PM (EST) from the Tanegashima Space
Center in Japan.
The rainfall measuring instruments on the TRMM satellite include the
Precipitation Radar (PR), an ... electronically scanning radar operating
at 13.8 GHz; TRMM Microwave Image (TMI), a nine-channel passive
microwave radiometer; and Visible and Infrared Scanner (VIRS), a
five-channel visible/infrared radiometer.
The purpose of the 3B42 algorithm is to produce TRMM-adjusted
merged-infrared (IR) precipitation and root-mean-square (RMS)
precipitation-error estimates. The algorithm consists of two separate
steps. The first step uses the TRMM VIRS and TMI orbit data (TRMM
products 1B01 and 2A12) and the monthly TMI/TRMM Combined Instrument
(TCI) calibration parameters (from TRMM product 3B31) to produce
monthly IR calibration parameters. The second step uses these derived
monthly IR calibration parameters to adjust the merged-IR
precipitation data, which consists of GMS, GOES-E, GOES-W, Meteosat-7,
Meteosat-5, and NOAA-12 data. The final gridded, adjusted merged-IR
precipitation (mm/hr) and RMS precipitation-error estimates have a
3-hourly temporal resolution and a 0.25-degree by 0.25-degree spatial
resolution. Spatial coverage extends from 50 degrees south to 50
degrees north latitude.
The daily accumulated (beginning at 00Z and ending at 21Z; unit: mm)
rainfall product is derived from this 3-hourly product. The data are stored in flat binary. The file size is about 2.25 MB (uncompressed).
Data Set Citation
Dataset Originator/Creator: Tropical Rainfall Measurement Mission Project (TRMM)
Dataset Title: Daily TRMM and Others Rainfall Estimate (3B42 V6 derived)
Version: 6Online Resource: http://disc.sci.gsfc.nasa.gov/precipitation/documentation/TRMM_READ...
Start Date: 1997-12-31
Latitude Resolution: 0.25 degree
Longitude Resolution: 0.25 degree
Horizontal Resolution Range: 10 km - < 50 km or approximately .09 degree - < .5 degree
Vertical Resolution: Surface
Temporal Resolution: Daily
Temporal Resolution Range: Daily - < Weekly
ISO Topic Category
Quality Adjusted GPI relative error estimates are provided for each 0.25 x 0.25
degree box. There are currently no known deficiencies in the 3B42
algorithm. The quality of the 3B42 product is highly sensitive to the
quality of the input data: TRMM VIRS (product 1B01), TMI (product
2A12), and TRMM Combined Instrument (TCI) (product 3B31). If the
quality of the input data is less than anticipated, then the quality
of 3B42 will also be less.
Access Constraints None
Data Set Progress
Distribution Media: FTP
Distribution Size: file size: 2250 kb
Distribution Format: HDF
Email: Robert.F.Adler at nasa.gov
Mesoscale Atmospheric Processes Branch Laboratory for Atmospheres NASA/Goddard Space Flight Center Code 613 USA
Province or State: MD
Postal Code: 20771
Role: TECHNICAL CONTACT
Phone: (301) 614-5165
Fax: (301) 614-5268
Email: gsfc-help-disc at lists.nasa.gov
Hydrology Data Support Team, Code 610.2 Goddard Space Flight Center
Province or State: MD
Postal Code: 20771
Huffman, G.J., 1997: "Estimates of Root-Mean-Square Random Error for
Finite Samples of Estimated Precipitation," J. Appl. Meteor.,
Huffman, G.J., R.F. Adler, P. Arkin, A. Chang, R. Ferraro, A. Gruber,
J. ... Janowiak, A. McNab, B. Rudolph, and U. Schneider, 1997: "The Global
Precipitation Climatology Project (GPCP) Combined Precipitation
Dataset," Bul. Amer. Meteor. Soc., 78, 5-20.
Huffman, G.J., R.F. Adler, B. Rudolph, U. Schneider, and P. Keehn,
1995: "Global Precipitation Estimates Based on a Technique for
Satellite-Based Estimates, Rain Gauge Analysis, and NWP Model
Precipitation Information," J. Clim., 8, 1284-1295.
Interface Control Specification Between the Tropical Rainfall
Mission Science Data and Information System (TSDIS) and the TSDIS
Science User (TSU). Volume 4: File Specifications for TSDIS
and Level 3. NASA Goddard Space Flight Center, March 17, 2000
( http://pps.gsfc.nasa.gov/ ).
gpi_daily-pentad_products.README file at anonymous FTP site:
ftp.ncep.noaa.gov in directory /pub/precip/TRMM/ir-products.
Creation and Review Dates
DIF Creation Date: 2006-09-12
Last DIF Revision Date: 2010-01-14