HY-2C 25 km wind vectors

Operational Near real time product

Near-real time level 2 ocean wind vectors on a 25 km swath grid, based on the backscatter measurements of the Chinese National Satellite Ocean Application Service (NSOAS) HY-2C/HSCAT scatterometer. Winds from the same instrument on HY-2C and HY-D are also processed by OSI SAF.

Acronym : HY2C25
Product navigator reference :


OSI SAF producer : Royal Netherlands Meteorological Institute
Identifier : OSI-115-a
Digital object identifier (DOI) 10.15770/EUM_SAF_OSI_NRT_2002
Acronym for EDC (APNM) : OHCSW025
Citation : See at bottom
Processing level : L2
Satellite input : HY-2C/ HSCAT
Other input : NWP outputs (wind, SST, land-sea mask)
Temporal sampling : 15 files per day
Central time : NA
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. 3 hours*
Spatial coverage : Global
Spatial sampling : 25 km
Projection : Swath
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: hy2c

EUMETSAT Multicast

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
* Operational analyses and ocean models
* Research or Environmental monitoring.
Authorised to be operational / released :
Declared operational / released since :
On EUMETCast since :
On EDC since :
On FTP server since :
Expected date for operational/released :
First date :
Full series temporal coverage : 2021-onwards
Citation : OSI SAF HY-2C 25 km wind vectors 2021-onwards, OSI-115-a, doi: 10.15770/EUM_SAF_OSI_NRT_2002. 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…
  • *  Notes: 25% of the data is available after 3 hours.
    Timeliness may improve depending on the number of data downloads  through the ground station in Finland (or other polar ground stations).

    • See also OSI-115-b (HY-2C 50 km wind vectors)
    • The distribution of this product is subject to the conditions set in the EUMETSAT-NSOAS cooperation agreement.
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