MetOp-A ASCAT Level 2 25.0 km Ocean Surface Wind Vectors
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Short NameASCATA-L2-25km
DescriptionThis dataset contains operational near-real-time Level 2 ocean surface wind vector retrievals from the Advanced Scatterometer (ASCAT) on MetOp-A at 25 km sampling resolution (note: the effective resolution is 50 km). 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). The wind vector retrievals are currently processed using the CMOD7.n geophysical model function using a Hamming filter to spatially average the Sigma-0 data in the ASCAT L1B data. Each file is provided in netCDF version 3 format, and contains one full orbit derived from 3-minute orbit granules. Latency is approximately 2 hours from the latest measurement. The beginning of the orbit is defined by the first wind vector cell measurement within the first 3-minute orbit granule that starts north of the Equator in the ascending node. ASCAT is a C-band dual fan beam radar scatterometer providing two independent swaths of backscatter retrievals in sun-synchronous polar orbit aboard the MetOp-A platform. For more information on the MetOp mission, please visit: . For more timely announcements, users are encouraged to register with the KNMI scatterometer email list: Users are also highly advised to check the dataset user guide periodically for updates and new information on known problems and issues. 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.
Dataset TypePREVIEW
MeasurementOCEANS > OCEAN WINDS > SURFACE WINDS > Ocean Surface Wind Vectors
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-Mar-27 to Present
Granule Time Span: 2007-Mar-27 to 2020-Sep-29
ResolutionSpatial Resolution: 25 km (Along) x 25 km (Across)
ProjectionType: Swath
Detail: Twin-Swath, each 525 km wide, sub-track (nadir) gap of 725 km
Ellipsoid: GEM6
Latency2 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-Feb-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: 2010-Jan-21
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-ASOP2-25X01
Questions related to this dataset? Contact
User's Guide
User's Guide
ASCAT Level 2 User's Guide
Project Materials
Scatterometry Training Material
Training resources for scatterometry data provided by KNMI
ASCAT Documents
Calibration, Validation, etc...
MetOp Mission Summary Page
Mission and Instrument Overview
KNMI/OSI-SAF Publications
Reports and Publications
Known Issues
Historical Listing of Inter-orbit Datagaps
MetOp-A ASCAT Modifications and Anomalies
History of Reported Modifications, Anomalies, etc...
Citation EUMETSAT/OSI SAF. 2010. MetOp-A ASCAT Level 2 25.0 km Ocean Surface Wind Vectors. Ver. Operational/Near-Real-Time. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD].

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For more information see Data Citations and Acknowledgments.

Journal Reference Verspeek, J. A., A. Stoffelen, M. Portabella, H. Bonekamp, C. Anderson, and J. Figa (2009), Validation and calibration of ASCAT using CMOD5.n, IEEE Trans. Geosci. Remote Sens., 48, 1, 386-395, doi:10.1109/TGRS.2009.2027896.