Visible and Infrared Scanner (VIRS) Level 1 Calibrated Radiance Products (TRMM Product 1B01)Entry ID: GES_DISC_TRMM_1B01_V7
Abstract: The Tropical Rainfall Measuring Mission (TRMM) is a joint U.S.-Japan satellite mission to monitor tropical and subtropical precipitation.
The Level 1B product file (1B01) contains 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.
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: 7Online Resource: http://mirador.gsfc.nasa.gov/cgi-bin/mirador/presentNavigation.pl?t...
Start Date: 1997-12-08
Latitude Resolution: 2.2 km
Longitude Resolution: 2.2 km
Horizontal Resolution Range: 1 km - < 10 km or approximately .01 degree - < .09 degree
Temporal Resolution: 16 orbits per day
Temporal Resolution Range: Daily - < Weekly
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED IMAGERY > RADIANCE @ 1.6UM
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED IMAGERY > RADIANCE @ 3.75UM
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED RADIANCE
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > SENSOR COUNTS
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > THERMAL INFRARED > RADIANCE @ 10.8UM
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > THERMAL INFRARED > RADIANCE @ 12.0UM
SPECTRAL/ENGINEERING > PLATFORM CHARACTERISTICS > ATTITUDE CHARACTERISTICS
SPECTRAL/ENGINEERING > SENSOR CHARACTERISTICS > VIEWING GEOMETRY > SATELLITE LOCAL ZENITH ANGLE
SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > SENSOR COUNTS
SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE IMAGERY > RADIANCE @ 0.63UM
SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE RADIANCE
Quality Please see the Marine Science Support Data Quality Report via the Related URL section.
Where data for a particular sensor do not exist for a particular time, the last known value is used unless the sensor has been disabled or has encountered an error. For example, some sensors only record data every minute, but the resolution for the underway dataset is 10 seconds, so the same value will be used 6 times a minute. No averages are taken for sensors that capture data at a rate other than every 10 seconds. Instead, each record will be a snapshot of each sensor at that time.
Access Constraints Data are available on-line via the Australian Antarctic Division Data Centre web page (or Related URL section).
Use Constraints This data set conforms to the PICCCBY Attribution License
Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=199293010 when using these data.
Data Set Progress
Distribution Media: HTTP
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Phone: +61 3 6232 3106
Email: jono.reeve at aad.gov.au
203 Channel Highway Australian Antarctic Division
Province or State: Tasmania
Postal Code: 7050
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 1999-10-07
Last DIF Revision Date: 2013-02-19