Metop-B ASCAT coastal Winds

Operational Near real time product

The ASCAT Wind Product contains measurements of the wind direction and wind speed above the sea surface. The measurements are obtained through the processing of scatterometer data originating from the ASCAT instrument on EUMETSAT's Metop-A satellite, as described in the ASCAT Wind Product User Manual.

Acronym : ASCAT12+
Product navigator reference :


OSI SAF producer : Royal Netherlands Meteorological Institute
Identifier : OSI-104-b
Digital object identifier (DOI) 10.15770/EUM_SAF_OSI_NRT_2018
Acronym for EDC (APNM) : OASWC12
Citation : See at bottom
Processing level : L2
Satellite input : Metop-B/ASCAT
Other input : ECMWF outputs (wind, SST, land-sea mask)
Temporal sampling : Continuous
Timeliness : ? The timeliness is the time elapsing from the sensing time of the last contributing file to the product dissemination to users. It is similar to the latency. 2 h 45
Spatial coverage : Global
Spatial sampling : 12.5 km
File Formats : WIND FTP Server (BUFR), WIND FTP Server (NetCDF3), EDC (BUFR), EDC (NetCDF3), EUMETCast (BUFR)
Characteristics & methods : Swath sigma0’s and wind vectors
Data Access
Credentials for access to OSI SAF tools For the FTP access, you need credentials which are provided on request, after registration on OSI SAF web site.

OSI SAF FTP (last 3 days)

Directory: ascat_b_osi

EUMETSAT Multicast


EUMETSAT Online Map Service

Redistribution by PO.DAAC

Accuracy Requirements
Target accuracy : Better than 2 m/s in wind component Stdev with an absolute mean difference of less than 0.5 m/s in wind speed on a monthly basis.
Verification/validation method : Triple collocation with NWP and buoys
Applications and users
Usage : * Operational Met Services (including assimilation in at least 8 NWP models, nowcasting)
* Operational analyses and ocean models
* Research or Environmental monitoring.
Declared operational / released since :
Full series temporal coverage : 2013-onwards
Detailed history :

The product series is operational since 2009:

  • Metop-A 12.5 km product (OSI-103) operational from 03/03/2009, discontinued on 28/04/2015
  • Metop-A coastal product (OSI-104) operational from 28/04/2015. The coastal wind product has superseded the 12.5 km wind product.
  • Metop-B coastal product (OSI-104-b) operational from 27/05/2013
  • Metop-C coastal product (OSI-104-c) operational from 2 October 2019
Citation : OSI SAF Metop-B ASCAT coastal Winds 2011-onwards, OSI-104-b, doi: 10.15770/EUM_SAF_OSI_NRT_2018. EUMETSAT Ocean and Sea Ice Satellite Application Facility. Data extracted from [distributor/distribution mean]: ([extracted period],) ([extracted domains],) accessed [download date]

The content within square brackets "[…]" is to be replaced with whatever distributor, period, domain or download date is relevant to the data being used. The "extracted period" and "extracted domains" are only needed if a subset of the data is being used.
Suggestions for "distributor/distribution mean": OSI SAF FTP server/the EUMETSAT Data Centre/EUMETCast/name and URL of a redistributor…
  • This product superseded :

    EO:EUM:DAT:METOP:OAS012 (from 28/02/2011 to 28/04/2015)

    EO:EUM:DAT:METOP:ASCAT12 (from 31/12/2008 to 28/02/2011)

    See also OSI-104 (Metop-A ASCAT 12.5 km Winds)

    Product upgraded on 2018-09-25: geophysical model function CMOD7 used instead of CMOD5, auxiliary data " stress-equivalent ECMWF winds " instead of "real 10m ECMWF background model winds"

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