QUIKSCAT_BYU_L3_OW_SIGMA0_ENHANCED_1

PODAAC-QSBYU-ENR00

Version 1
  • Abstract
    This dataset contains enhanced resolution gridded fields of the normalized radar cross-section (sigma-0) made from the SeaWinds on QuikSCAT L1B dataset using two different forms of the single-variate Scatterometer Image Reconstruction (SIR) algorithm: 1) for 'egg' sigma-0 measurements and 2) for 'slice' sigma-0 measurements, where the SIR with filtering (SIRF) algorithm is used. For 'egg' measurements, the full antenna/processing spatial response is used while a simplified spatial response function in which the spatial response is assumed to be 1 over the footprint and 0 elsewhere is used for 'slice' measurements. The SIR algorithm with 'eggs' makes images of sigma-0 at the measurement incidence angle at 4.5 km pixel resolution. The effective resolution varies depending on region and sampling conditions but is estimated to be 8-10 km in most areas. The SIRF algorithm with 'slices' makes images at 2.225 km pixel resolution with an estimated effective resolution of 6-8 km. It is worth noting that 'slice' measurements are inherently noisier than 'egg' measurements. This dataset has been pre-subsetted for the following regions: Alaska, Amazonia, Antarctica, Arctic, Australia, Bering Strait, Greenland, Central America, East China Sea, Sea of Japan, Europe, Indonesia, Northern Africa, North America, Southern Africa, South America, Southern Asia, and Siberia. Non-enhanced fields are also provided at lower resolution in a 'GRD' gridded format that does not utilize SIR processing; 'GRD' fields are provided at 11.125 km and 22.25 km pixel resolution for slices and eggs, respectively. In addition to Sigma-0, various statistical parameters are provided for added guidance, including but not limited to: standard deviation of incidence angle, mean incidence angle, measurement counts, pixel time, mean reconstruction error, and standard deviation of the reconstructed sigma-0. Sigma-0 fields are available for specific ascending/descending nodes, local time of day, or as a daily average. SIR-formatted land mask files (containing 0 for ocean and 1 for land) are available for each standard region. SIR-formatted files containing the gridded latitude and longitude pixel locations within each region are also available. All SIR files are produced in IEEE formatted binary and gzipped for ease of transfer and storage. Each SIR file adheres to a specific naming convention, as shown here: http://scp.byu.edu/docs/SIRfilename.html. Some additional user notes can be found here: http://www.scp.byu.edu/docs/QSCAT_user_notes.html.

Data Identification Fields:

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    Data Dates
    Creation
    Last Revision
    Processing Level

    3

    Quality
    Collection Progress

    Not Provided

Related URLs
    Science Keywords
    • Earth Science
    • Cryosphere
    • Sea Ice
    • Ice Extent
    • Earth Science
    • Spectral/Engineering
    • Radar
    • Sigma Naught
    • Normalized Radar Cross-Section

Acquisition Information Fields:

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Platforms
  • SPACECRAFT
    QUIKSCAT
    Instruments
    • SEAWINDS

Temporal Information Fields:

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Spatial Information Fields:

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    Coverage Type Zone Identifier Geometry Granule Representation
    HORIZONTAL CARTESIAN CARTESIAN
Location Keywords
    • OCEAN
    • PACIFIC OCEAN
    • NORTH PACIFIC OCEAN
    • BERING SEA
    • CONTINENT
    • NORTH AMERICA
    • CENTRAL AMERICA
    • CONTINENT
    • AFRICA
    • SOUTHERN AFRICA
    • SOUTH AFRICA
    • OCEAN
    • INDIAN OCEAN
    • INDONESIA
    • CONTINENT
    • ASIA
    • SOUTHERN ASIA
    • CONTINENT
    • NORTH AMERICA
    • OTHER
    • North Africa
    • GEOGRAPHIC REGION
    • ARCTIC
    • CONTINENT
    • AUSTRALIA/NEW ZEALAND
    • AUSTRALIA
    • CONTINENT
    • EUROPE
    • CONTINENT
    • SOUTH AMERICA
    • CONTINENT
    • ASIA
    • EASTERN ASIA
    • JAPAN
    • CONTINENT
    • ASIA
    • EASTERN ASIA
    • CHINA
    • CONTINENT
    • NORTH AMERICA
    • GREENLAND
    • CONTINENT
    • ANTARCTICA
    • OTHER
    • Siberia
    • CONTINENT
    • NORTH AMERICA
    • UNITED STATES OF AMERICA
    • ALASKA

Data Centers

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  • BYU/SCP
    PROCESSOR

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  • PO.DAAC
    ARCHIVER

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  • Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, N
    ARCHIVER
    Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA

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Data Contacts

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  • User Services
    Technical Contact
    User Services

    Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, N

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Collection Citations Fields:

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Metadata Dates
Last Revision