# OSI SAF ASCAT ocean wind products
*data products*

## Specifications
- **level**: L2
- **distributor**: eumetsat
- **access endpoint**: https://osi-saf.eumetsat.int/products/wind-products
- **access model**: open
- **primary data portal url**: https://osi-saf.eumetsat.int/products/wind-products
- **use cases**: ["Ocean surface wind speed and direction","Numerical weather prediction","Marine forecasting"]
- **deployment context**: orbital
- **entity type**: data_product
- **last verified date**: 2026-06-11
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: eumetsat
- **attributes**: {"level":"L2","distributor":"eumetsat","access_endpoint":"https://osi-saf.eumetsat.int/products/wind-products","access_model":"open","primary_data_portal_url":"https://osi-saf.eumetsat.int/products/wind-products","use_cases":"[\"Ocean surface wind speed and direction\",\"Numerical weather prediction\",\"Marine forecasting\"]","deployment_context":"orbital"}
- **relevance**: in-scope

## Editorial
OSI SAF ASCAT ocean wind products are Level-2 ocean surface wind retrievals derived from the Advanced SCATterometer (ASCAT) on MetOp-A, MetOp-B, and MetOp-C, produced by KNMI for the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF).[^osisaf-wind-products-page] Wind speed (10 m equivalent neutral, m/s) and wind direction (degrees, meteorological convention) are retrieved at 25 km grid spacing for the standard product, with a 12.5 km coastal variant (OSI-104) for near-shore applications.[^osisaf-osi102b-metop-b][^osisaf-osi102c-metop-c] Auxiliary variables include C-band sigma0 from the fore, mid, and aft beams, wind speed uncertainty, ice probability, and quality flags. Product IDs in the current archive include OSI-102-b (MetOp-B 25 km NRT), OSI-102-c (MetOp-C 25 km NRT), OSI-104-b (MetOp-B 12.5 km coastal NRT), OSI-104-c (MetOp-C 12.5 km coastal NRT), OSI-150-a (MetOp-A 25 km climate data record 2007-2014), and OSI-150-b (MetOp-A 12.5 km climate data record 2007-2014).[^osisaf-osi102b-metop-b][^osisaf-osi150a-climate] The retrieval algorithm was CMOD5 and its successor CMOD5.n in earlier product versions; NRT operations were upgraded to CMOD7 on 2018-09-25 and the climate data record (OSI-150) was reprocessed with CMOD7.[^osisaf-wind-products-page][^podaac-cmod7-upgrade] NRT delivery latency is approximately 2 h 45 min from sensing. MetOp-B NRT coverage runs from 2013-05-27; MetOp-C NRT from 2019-02-12.[^osisaf-osi102b-metop-b][^osisaf-osi102c-metop-c] Products are distributed in BUFR (NRT) and NetCDF (climate record) formats under a CC-BY-4.0 licence, open access via the OSI SAF portal.

## Compositional position
- OSI SAF ASCAT ocean wind products --[related]--> metop-a (missions)
- OSI SAF ASCAT ocean wind products --[related]--> metop-b (missions)
- OSI SAF ASCAT ocean wind products --[related]--> metop-c (missions)
- ocean-surface-winds (topics) --[topic_capabilities]--> OSI SAF ASCAT ocean wind products

## Sources
- [osisaf-wind-products-page] | OSI SAF wind products overview, EUMETSAT | https://osi-saf.eumetsat.int/products/wind-products | tier=agency-doc | accessed=2026-06-11
- [osisaf-osi102-metop-a] | Metop-A ASCAT 25 km Winds OSI-102, EUMETSAT OSI SAF | https://osi-saf.eumetsat.int/products/osi-102 | tier=agency-doc | accessed=2026-06-11
- [osisaf-osi102b-metop-b] | Metop-B ASCAT 25 km Winds OSI-102-b, EUMETSAT OSI SAF | https://osi-saf.eumetsat.int/products/osi-102-b | tier=agency-doc | accessed=2026-06-11
- [osisaf-osi102c-metop-c] | Metop-C ASCAT 25 km Winds OSI-102-c, EUMETSAT OSI SAF | https://osi-saf.eumetsat.int/products/osi-102-c | tier=agency-doc | accessed=2026-06-11
- [osisaf-osi150a-climate] | Metop-A ASCAT L2 25 km winds data record OSI-150-a, EUMETSAT OSI SAF | https://osi-saf.eumetsat.int/products/osi-150-a | tier=agency-doc | accessed=2026-06-11
- [podaac-cmod7-upgrade] | CMOD7 upgrade announcement NRT OSI SAF ASCAT products, PO.DAAC/NASA | https://podaac.jpl.nasa.gov/announcements/2018-06-13_Upcoming_upgrade_NRT_OSI_SAF_and_EARS_ASCAT_wind_products | tier=agency-doc | accessed=2026-06-11

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Source: https://eo-atlas.org/data_products/osi-saf-ascat-winds
Maintainer: SpectraWorks B.V. (CC-BY 4.0)