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Satellite Synthetic Aperture Radar (SAR)-derived Sea Surface Wind Archive and Quality Monitoring

Introduction

The level-2 high resolution sea surface winds from the Synthetic Aperture Radar (SAR) on board RADARSAT-2, Sentinel-1A and Sentinel-1B satellites are produced by the NOAA Center for Satellite Applications and Research (STAR) and Office of Satellite and Product Operations (OSPO). Satellite SAR products are useful to many users on timeframes from near-real-time to long-term climatology. SAR product near-real-time users, such as the National Weather Service and the National Ocean Service receive these products via the NOAA CoastWatch and direct distribution from OSPO. These products have been archived in the National Centers for Environmental Information (NCEI) to support delayed use for purposes such as: (1) development of coastal wind climatologies for off-shore wind farm studies and monitoring, (2) studies of relation between coastal winds and synoptic weather patterns, and (3) wind validation by comparison with buoys, scatterometers, and meteorological models.

The products are released in a NOAA CoastWatch netCDF-4 formats. The basic archive file contain product geographically-referenced wind speed array, a land mask, an ice mask, and radar geometry information. Where permissible under licensing agreements an array of the original radar cross section data is included. For reference purposes, the files also include GFS wind speed vectors sampled at the SAR resolution. Also archived are maps of the wind speed in GeoTiFF. Each product covers the geographic extent of the SAR image frame from which it was derived. Individual SAR images, and thus the product datasets can be located anywhere in the world.

The data quality monitoring systems (DQMS) on the level-2 SAR wind products has been developed by the NCEI Satellite Oceanography team. The DQMS computes descriptive statistics of quality assurance (QA) for instance, observation number, standard deviation, mean, minimum and maximum of wind speed field. These descriptive statistics are calculated in each level-2 granule (data file) and visualized when the data are archived and published at NCEI.

Access NCEI Archived Level-2 SAR Wind Data

Protocol RADARSAT-2 Sentinel-1A & 1B
HTTP https://data.nodc.noaa.gov/sar-winds/radarsat2/ https://data.nodc.noaa.gov/sar-winds/sentinel1/
FTP ftp://ftp.nodc.noaa.gov/pub/data.nodc/sar-winds/radarsat2/ ftp://ftp.nodc.noaa.gov/pub/data.nodc/sar-winds/sentinel1/
THREDDS https://data.nodc.noaa.gov/thredds/catalog/sar-winds/radarsat2/ https://data.nodc.noaa.gov/thredds/catalog/sar-winds/sentinel1/
Details gov.noaa.nodc:SAR-WINDS-RSAT2 gov.noaa.nodc:SAR-WINDS-S1

Access Real-Time Level-2 SAR Wind Data

  • NOAA CoastWatch: https://coastwatch.noaa.gov/cw_html/Winds_SAR.html
  • NOAA OSPO: http://www.ospo.noaa.gov/Products/ocean/sar/index.html
  • Level-2 SAR Wind Data Quality Monitoring

    The following figures present QA descriptive statistics of wind speed in each RADARSAT-2, Sentinel-1A and Sentinel-1B level-2 granule (orbit data file) after the land/ice mask and other quality flags have been applied. The statistics include total valid observation number, standard deviation, mean, minimum and maximum from the past three months to present.

    RADARSAT-2

    QA Statistics of Level-2 Wind Speed
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    QA Statistics of Level-2 Wind Speed
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    QA Statistics of Level-2 Wind Speed
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    Sentinel-1A

    QA Statistics of Level-2 Wind Speed
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    QA Statistics of Level-2 Wind Speed
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    QA Statistics of Level-2 Wind Speed
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    Sentinel-1B

    QA Statistics of Level-2 Wind Speed
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    QA Statistics of Level-2 Wind Speed
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    QA Statistics of Level-2 Wind Speed
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