Visible and Infrared Scanner (VIRS) Level 1 Calibrated Radiance Products (TRMM Product 1B01)
Entry ID: GES_DISC_TRMM_1B01_CSI_V6

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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 Visible and Infrared Scanner (VIRS) is a five-channel
visible/infrared radiometer, which builds on the heritage of the
Advanced Very High Resolution Radiometer (AVHRR) instrument flown
aboard the NOAA series of Polar-Orbiting Operational Environmental
Satellites (POES). The VIRS detects radiation at 1 visible, 2 near
infrared and 2 thermal infrared wavelengths, allowing determination of
cloud coverage, cloud top height and temperature, and precipitation
indices. The central wavelengths for the VIRS channels are 0.63, 1.60,
3.75, 10.8, and 12.0 microns. All channels are in operation during the
daytime, but only channels 3, 4 and 5 operate during the nighttime.

The Level 1B product file (1B01) from the VIRScontains calibrated radiances and
auxiliary geolocation information for each pixel in the scan. The
Level 1B data are stored in the Hierarchical Data Format (HDF), which
includes both core and product specific metadata applicable to the
VIRS measurements. A file contains a single orbit of data with a file
size of about 87 MB (uncompressed). The HDF-EOS "swath" structure is
used to accommodate the actual geophysical data arrays. As in the case
of the Level 1A data, there are 16 files of VIRS 1B01 data
produced per day.

For channels 1 and 2, Level 1B radiances are derived from the Level 1A
sensor counts by computing calibration parameters (gain and offset)
derived from the counts registered during space and solar and/or lunar
views. New calibration parameters are produced every 1 to 4
weeks. Bands 3, 4, and 5 are calibrated using the internal blackbody
and the space view. These two data points, together with a quadratic
term determined pre-launch, are used to generate a counts vs. radiance
curve for each band, which is then used to convert the earth-view pixel
counts to spectral radiances.

For the Level 1B data, geolocation and channel data are written out
for each pixel along the scan, whereas the time stamp, scan status
(containing scan quality information), navigation, calibration
coefficients, and satellite/ solar geometry are specified on a per-scan
basis. There are in general 18026 scans along the orbit with each scan
consisting of 261 pixels. The scan width is about 720 km.

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.

Related URL
Link: GET DATA
Description: Data access for TRMM Visible and Infrared Scanner (VIRS) Level 1 Calibrated
Radiance Product 1B01


Link: VIEW RELATED INFORMATION
Description: Readme file for TRMM Visible and Infrared Scanner (VIRS) Level 1 Calibrated
Radiance Product 1B01


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: 40.0 S: 4.375  E: -55.4178  W: -99.3322
 N: -12.5 S: -40.0  E: 163.7138  W: 116.2862

Data Set Citation
Dataset Originator/Creator: NASA,JAXA, Tropical Rainfall Measuring Mission (TRMM)
Dataset Title: Visible and Infrared Scanner (VIRS) Level 1 Raw and Calibrated Radiance Products (TRMM Product 1B01)
Version: Version 6
Online Resource: http://daac.gsfc.nasa.gov/data/datapool/TRMM_DP/01_Data_Products/01...


Temporal Coverage
Start Date: 1997-12-08


Location Keywords
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > BAHAMAS > The Bahamas Station


Data Resolution


Science Keywords
SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS >INFRARED IMAGERY >RADIANCE @ 1.6UM    [Definition]
SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS >INFRARED IMAGERY >RADIANCE @ 3.75UM    [Definition]
SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS >INFRARED RADIANCE    [Definition]
SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS >SENSOR COUNTS    [Definition]
SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS >THERMAL INFRARED >RADIANCE @ 10.8UM    [Definition]
SPECTRAL/ENGINEERING >INFRARED WAVELENGTHS >THERMAL INFRARED >RADIANCE @ 12.0UM    [Definition]
SPECTRAL/ENGINEERING >PLATFORM CHARACTERISTICS >ATTITUDE CHARACTERISTICS    [Definition]
SPECTRAL/ENGINEERING >SENSOR CHARACTERISTICS >VIEWING GEOMETRY >SATELLITE LOCAL ZENITH ANGLE    [Definition]
SPECTRAL/ENGINEERING >VISIBLE WAVELENGTHS >SENSOR COUNTS    [Definition]
SPECTRAL/ENGINEERING >VISIBLE WAVELENGTHS >VISIBLE IMAGERY >RADIANCE @ 0.63UM    [Definition]
SPECTRAL/ENGINEERING >VISIBLE WAVELENGTHS >VISIBLE RADIANCE    [Definition]


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


Platform
TRMM >Tropical Rainfall Measuring Mission    [Information]


Instrument
VIRS >TRMM Visible Infrared Scanner    [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]


Keywords
EOSDIS


Data Set Progress
IN WORK


Originating Center
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 VIRS Level 1B Radiance 1B01

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: file size: 1808 kb
Distribution_Format: HDF
Fees: none


Personnel
WILLIAM BARNES
Role: INVESTIGATOR
Phone: 301-614-5672
Fax: 301-614-5666
Email: William.L.Barnes at nasa.gov
Contact Address:
NASA
Goddard Space Flight Center
Mailstop 614.0
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


HYDROLOGY DATA SUPPORT TEAM
Role: TECHNICAL CONTACT
Phone: (301) 614-5165
Fax: (301) 614-5268
Email: gsfc-help-disc at lists.nasa.gov
Contact Address:
Hydrology Data Support Team, Code 610.2
Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA



Creation and Review Dates
DIF Creation Date: 2009-02-13
Last DIF Revision Date: 2014-05-12

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