TRMM Microwave Imager (TMI) Level 1 Raw and Calibrated Radiance Products (TRMM Product 1A11)
Entry ID: GES_DISC_TRMM_1A11_V7

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Summary
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 TRMM Microwave Imager (TMI) is a nine-channel passive microwave radiometer, which builds on the heritage of the Special Sensor Microwave/Imager (SSM/I) instrument flown aboard the Defense Meteorological Satellite Program (DMSP) platforms. Microwave radiation is emitted by the Earth's surface and by water droplets within clouds. However, when layers of large ice particles are present in upper cloud regions - a condition highly correlated with heavy rainfall - microwave radiation tends to scatter at frequencies above 19 GHz. The TMI detects radiation at five frequencies chosen to discriminate among these processes, thus revealing the likelihood of rainfall. The key to accurate retrieval of rainfall rates by this method is the deduction of cloud precipitation consistent with the radiation measurement at each frequency. The TMI frequencies are 10.65, 19.35, 37 and 85.5 GHz (dual polarization), and 21 GHz (vertical polarization only).

The Level 1A product file (1A11) is a concatenation of the Level 0 data with a header record and, as such, is reversible to Level 0. The header record contains information pertaining to orbit times, orbit number, times of the first scan and number of scans, among other things. The Level 0 data contain the actual channel data expressed as "sensor counts." A file contains data for a single orbit with a file size of about 7 MB (uncompressed). There are 16 files of TMI 1A11 data produced per day.

Spatial coverage is between 38 degrees North and 38 degrees South owing to the 35 degree inclination of the TRMM satellite. This orbit provides extensive coverage in the tropics and allows each location to be covered at a different local time each day, enabling the analysis of the diurnal cycle of precipitation.

File Specifications for TRMM Products: ftp://pps.gsfc.nasa.gov/pub/v7filespec/filespec.TRMM.V7.pdf

Metadata for TRMM Products: ftp://pps.gsfc.nasa.gov/pub/v7filespec/filespecMeta.TRMM.V7.pdf

TRMM V6 vs. V7 Major Data Format Changes: http://pps.gsfc.nasa.gov/Documents/formatChangesV7.pdf

Related URL
Link: GET DATA > MIRADOR
Description: Data access for TRMM TMI Raw Data (1A_11)


Link: GET DATA > MIRADOR
Description: DESCRIPTION = The Mirador Earth Science Data Search Tool includes TRMM 1A11, TRMM Microwave Imager (TMI) Level 1 Raw and Calibrated Radiance Products. Mirador features include location and event gazetteers.


Link: VIEW RELATED INFORMATION
Description: This URL contains information and data access for all of the Goddard DAAC's hydrology data holdings, including TRMM data from the TMI, Precipitation Radar (PR), and Visible and Infrared Scanner (VIRS) instruments, the Ground Validation (GV) radar data, and ancillary and correlative data products.


Geographic Coverage
 N: 38.0 S: -38.0  E: 180.0  W: -180.0

Data Set Citation
Dataset Originator/Creator: NASA,JAXA, Tropical Rainfall Measuring Mission (TRMM)
Dataset Title: TRMM Microwave Imager (TMI) Level 1 Raw and Calibrated Radiance Products (TRMM Product 1A11)
Version: 7
Online Resource: http://mirador.gsfc.nasa.gov/cgi-bin/mirador/presentNavigation.pl?t...


Temporal Coverage
Start Date: 1997-12-07


Location Keywords
GEOGRAPHIC REGION > TROPICS


Data Resolution
Latitude Resolution: 5-45 km
Longitude Resolution: 5-45 km
Temporal Resolution: 16 orbits per day


Science Keywords
SPECTRAL/ENGINEERING >MICROWAVE >BRIGHTNESS TEMPERATURE    [Definition]
SPECTRAL/ENGINEERING >MICROWAVE >MICROWAVE RADIANCE    [Definition]
SPECTRAL/ENGINEERING >MICROWAVE >SENSOR COUNTS    [Definition]
SPECTRAL/ENGINEERING >PLATFORM CHARACTERISTICS >ATTITUDE CHARACTERISTICS    [Definition]
SPECTRAL/ENGINEERING >SENSOR CHARACTERISTICS >VIEWING GEOMETRY >SATELLITE LOCAL ZENITH ANGLE    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION
IMAGERY/BASE MAPS/EARTH COVER


Platform
TRMM >Tropical Rainfall Measuring Mission    [Information]


Instrument
TMI >TRMM Microwave Imager    [Information]


Project
EOS >Earth Observing System    [Information]
EOSDIS >Earth Observing System Data Information System    [Information]
ESIP >Earth Science Information Partners Program    [Information]
TRMM >Tropical Rainfall Measuring Mission Project    [Information]
CWIC >CEOS WGISS Integrated Catalog    [Information]


Quality
For the Level 1A TMI product, quality indicators are set indicating
whether anomalies have been detected in the decoding of the Attitude
Control System (ACS), Housekeeping (HK), and Science data packets.


Access Constraints
None


Keywords
EOSDIS


Originating Center
GSFC_GES_DISC


Data Center
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA    [Information]
Data Center URL: http://disc.gsfc.nasa.gov/
Dataset ID: TRMM Level 1A Radiance 1A11

Data Center Personnel
Name: GES DISC HELP DESK SUPPORT GROUP
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at lists.nasa.gov
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA



Distribution
Distribution_Media: FTP
Distribution_Size: Average file size: 6200 KB
Distribution_Format: Text
Fees: none


Personnel
GES DISC HELP DESK SUPPORT GROUP
Role: TECHNICAL CONTACT
Phone: 301-614-5224
Fax: 301-614-5268
Email: gsfc-help-disc at lists.nasa.gov
Contact Address:
Goddard Earth Sciences Data and Information Services Center
Code 610.2
NASA Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


ZHONG LIU
Role: DIF AUTHOR
Email: Zhong.Liu-1 at nasa.gov
Contact Address:
NASA
Goddard Space Flight Center
Mailstop 610.2
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


Publications/References

Creation and Review Dates
DIF Creation Date: 2011-07-15
Last DIF Revision Date: 2014-05-16

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