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    • GPM VIRS on TRMM Radiance L1B 1.5 hours 2 km V07 (GPM_1BVIRS) at GES DISC

    Metadata Updated: December 6, 2023

    This is the new (GPM-formated) TRMM product. It replaces the old TRMM_1B01

    Version 07 is the current version of the data set. Previous versions have been superseded by Version 07.

    This TRMM Visible and Infrared Scanner (VIRS) Level 1B Calibrated Radiance Product (1B01) contains calibrated radiances and auxiliary geolocation information from the five channels of the VIRS instrument, for each pixel of each scan. The 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 95 MB. The EOSDIS "swath" structure is used to accommodate the actual geophysical data arrays. 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 (1A01) 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 one to four weeks. Channels 3, 4, and 5 are calibrated using the internal blackbody and the space view. These calibration parameters, 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.

    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 solar/satellite geometry are specified on a per-scan basis. There are in general 18026 scans along the orbit pre-boost and 18223 post-boost, with each scan consisting of 261 pixels. The scan width is about 720 km pre-boost and 833 km post-boost.

    Changes in horizontal resolution resulting from the TRMM boost that occurred on 24 August 2001:

    Pre-Boost (before 7 August 2001): Temporal Resolution: 91.5 min/orbit ~ 16 orbits/day; Swath Width: 720 km; Horizontal Resolution: 2.2 km

    Post-Boost (after 24 August 2001): Temporal Resolution: 92.5 min/orbit ~ 16 orbits/day; Swath Width: 833 km; Horizontal Resolution: 2.4 km

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date December 1, 2022
    Metadata Updated Date December 6, 2023

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Graphic Preview

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date December 1, 2022
    Metadata Updated Date December 6, 2023
    Publisher NASA/GSFC/SED/ESD/GCDC/GESDISC
    Maintainer
    Identifier C2264132644-GES_DISC
    Data First Published 2021-07-21
    Language en-US
    Data Last Modified 2021-07-21
    Category TRMM, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.nasa.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Citation Tropical Rainfall Measuring Mission (TRMM). 2021-07-29. GPM_1BVIRS. GPM VIRS on TRMM Radiance L1B 1.5 hours 2 km V07. Greenbelt, MD. Archived by National Aeronautics and Space Administration, U.S. Government, Goddard Earth Sciences Data and Information Services Center (GES DISC). https://doi.org/10.5067/GPM/VIRS/TRMM/1B/07. https://disc.gsfc.nasa.gov/datacollection/GPM_1BVIRS_07.html. Digital Science Data.
    Creator Tropical Rainfall Measuring Mission (TRMM)
    Data Presentation Form Digital Science Data
    Graphic Preview File https://docserver.gesdisc.eosdis.nasa.gov/public/project/GPM/browse/1B-BR.TRMM.VIRS.Tb2017.20050829-S013444-E030706.044376.V05A.PNG
    Harvest Object Id 1f432896-0abf-4708-a6c6-8e2cd5d43f42
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/GPM/VIRS/TRMM/1B/07
    Metadata Type geospatial
    Old Spatial -180.0 -38.0 180.0 38.0
    Program Code 026:001
    Release Place Greenbelt, MD
    Series Name GPM_1BVIRS
    Source Datajson Identifier True
    Source Hash dcd73b53513fd5afa3f47f9555ddc878dcc70b6dc912a7a3dd7d02847da2fc09
    Source Schema Version 1.1
    Spatial
    Temporal 1997-12-20T00:00:00Z/2014-03-21T23:59:59.999Z

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