MetOp-A ASCAT Level 2 12.5-km Ocean Surface Wind Vector Climate Data Record Optimized for Coastal Ocean
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DescriptionThis dataset represents the first historically reprocessed Level 2 coastal ocean surface wind vector climate data record from the Advanced Scatterometer (ASCAT) on MetOp-A sampled on a 12.5 km grid. This coastal dataset utilizes a spatial box filter to generate a spatial average of the Sigma-0 retrievals from the Level 1B dataset and obtains additional winds near the coast. Since the full resolution L1B Sigma-0 retrievals are used, all non-sea retrievals are discarded prior to the Sigma-0 averaging. Each box average Sigma-0 is then used to compute the vector cell wind using the same CMOD7 geophysical model function as in the operational OSI SAF ASCAT wind vector datasets. With this enhanced coastal retrieval, winds are computed as close to ~15 km from the coast. Each file corresponds to one complete orbit and is provided in netCDF version 3 format. The beginning of the orbit files is defined near the South Pole. ASCAT is a C-band fan beam radar scatterometer, providing two independent swaths of backscatter retrievals, aboard the MetOp-A platform in sun-synchronous polar orbit. It is a product of the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT) Ocean and Sea Ice Satellite Application Facility (OSI SAF) provided through the Royal Netherlands Meteorological Institute (KNMI). For more information on the MetOp mission, please visit: For access to more contemporaneous and near-real-time MetOp-A ASCAT 12.5km data, please visit: For more timely announcements, users are encouraged to register with the KNMI scatterometer email list: All intellectual property rights of the OSI SAF products belong to EUMETSAT. The use of these products is granted to every interested user, free of charge. If you wish to use these products, EUMETSAT's copyright credit must be shown by displaying the words "copyright (year) EUMETSAT" on each of the products used. Use cases and feedback on the products will be much appreciated and in fact helps to sustain the reprocessing capability.
Dataset TypeOPEN
Processing Level2
CoverageRegion: Global
Northernmost Latitude: 89.6 degrees
Southernmost Latitude: -89.6 degrees
Westernmost Longitude: 0 degrees
Easternmost Longitude: 360 degrees
Time Span: 2007-Jan-01 to 2014-Apr-01
Granule Time Span: 2007-Jan-01 to 2014-Apr-01
ResolutionSpatial Resolution: 12.5 km (Along) x 12.5 km (Across)
ProjectionType: Swath
Detail: Twin-Swath, each 512.5 km wide, sub-track (nadir) gap of 737.5 km
Ellipsoid: GEM6
Latency hours
Swath Width1800000 m
Sample Frequency-
Temporal Repeat (Nominal)12 Hour
Temporal Repeat (Min)1.7 Hour
Temporal Repeat (Max)5 Day
Name: Meteorological Operational Satellite - A (METOP-A)
Orbit Period: 101.3 minutes
Inclination Angle: 98.7 degrees
Ascending Node: 2007-Jan-01 21:30:00
Name: Advanced Scatterometer (ASCAT)
Swath Width: 1800 km
Description: Dual fan beam C-band (5.25 GHz) vertically polarized scatterometer, providing measurements across two 550 km swaths, separated by a 700 km nadir blind region. This dual swath configuration allows ASCAT to provide more than twice the daily coverage of the ERS 1 and 2 predecessors with a coverage of nearly 70% of the ice-free oceans each day.

ProjectMeteorological Operational (MetOp)
Data ProviderCreator: EUMETSAT/OSI SAF
Release Place: KNMI, Royal Netherlands Meteorological Institute
Release Date: 2018-Apr-23
Keyword(s)metop-a, metop, wind data, wind, ocean wind, wind speed, vector, vectors, ocean wind vector, ocean wind vectors, knmi, osi saf, eumetsat
Persistent IDPODAAC-ASCDR-12C01
Questions related to this dataset? Contact
Format (Compression)NETCDF (GZIP)
Web Service
(Search Granule)
Tools and Services
SOTO (State Of The Ocean) Visualization (wind vectors, night)
SOTO (State Of The Ocean) Visualization (wind vectors, day)
SOTO (State Of The Ocean) Visualization (wind speed, day)
SOTO (State Of The Ocean) Visualization (wind speed, night)
Read Software
R read software
MATLAB read software
Python read software
Interactive Data Language read software
User's Guide
CDR User Guide
ASCAT Level 2 CDR User Guide
Project Materials
Scatterometry Training Material
Training resources for scatterometry data provided by KNMI
ASCAT L2 Winds Data Record Validation Report
Verhoef, A., J. Vogelzang and A. Stoffelen, 2016: ASCAT L2 Winds Data Record Validation Report Version 1.2. Technical Note, SAF/OSI/CDOP2/KNMI/TEC/RP/239, EUMETSAT.
MetOp Mission Summary Page
Mission and Instrument Overview
KNMI/OSI-SAF Publications
Reports and Publications
Citation EUMETSAT/OSI SAF. 2018. MetOp-A ASCAT Level 2 12.5-km Ocean Surface Wind Vector Climate Data Record Optimized for Coastal Ocean. Ver. 1.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at

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For more information see Data Citations and Acknowledgments.

Journal Reference Verhoef, A., J. Vogelzang, J. Verspeek and A. Stoffelen, Long-Term Scatterometer Wind Climate Data Records, IEEE Journal of Selected Topics in Applied Earth O, 2017, 10, 5, 2186-2194, doi:10.1109/JSTARS.2016.2615873.