# Sentinel-1 Level-2 Ocean (OCN)
*data products*

## Specifications
- **level**: L2
- **distributor**: esa
- **access endpoint**: https://documentation.dataspace.copernicus.eu/Data/Sentinel1.html
- **access model**: open
- **primary data portal url**: https://documentation.dataspace.copernicus.eu/Data/Sentinel1.html
- **use cases**: ["Ocean wind field","Ocean swell spectra","Surface radial velocity"]
- **deployment context**: orbital
- **entity type**: data_product
- **last verified date**: 2026-06-11
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: esa
- **attributes**: {"level":"L2","distributor":"esa","access_endpoint":"https://documentation.dataspace.copernicus.eu/Data/Sentinel1.html","access_model":"open","primary_data_portal_url":"https://documentation.dataspace.copernicus.eu/Data/Sentinel1.html","use_cases":"[\"Ocean wind field\",\"Ocean swell spectra\",\"Surface radial velocity\"]","deployment_context":"orbital"}
- **relevance**: in-scope

## Editorial
Sentinel-1 Level-2 Ocean (OCN) products are derived from the C-SAR instrument (C-band, 5.405 GHz) on Sentinel-1A, Sentinel-1B (until its mission ended in 2022) and Sentinel-1C, with data available from 2014-04-03.[^sentiwiki-s1-products] The product bundles three components. The Ocean Wind Field (OWI) delivers ground-range gridded estimates of 10 m wind speed and direction using the CMOD5.n geophysical model function applied to VV-polarisation backscatter; grid spacing is 1 km for Interferometric Wide (IW) and Stripmap (SM) modes, and 2 km for Extra Wide (EW) mode.[^s1-l12-rp-owi-spec] The Ocean Swell Spectra (OSW) component provides two-dimensional ocean surface swell spectra with wind speed and direction per 25 km vignette, primarily from Wave (WV) mode; since October 2025, OSW is also produced from IW and EW TOPS modes.[^sentiwiki-s1-products] The Surface Radial Velocity (RVL) component derives a Doppler difference field, providing a surface radial velocity proxy for IW and EW modes, offering continuity from the Envisat ASAR RVL product.[^sentiwiki-s1-products] Swath widths are 250 km (IW), 400 km (EW), 80 km (SM), and 20 km (WV); single-satellite revisit is 6 days. Products are distributed in NetCDF format under the Copernicus open-access licence via the Copernicus Data Space Ecosystem.

## Compositional position
- Sentinel-1 Level-2 Ocean (OCN) --[related]--> sentinel-1a (missions)
- Sentinel-1 Level-2 Ocean (OCN) --[related]--> c-sar (products)
- ocean-surface-winds (topics) --[topic_capabilities]--> Sentinel-1 Level-2 Ocean (OCN)
- sea-state (topics) --[topic_capabilities]--> Sentinel-1 Level-2 Ocean (OCN)
- ocean-currents (topics) --[topic_capabilities]--> Sentinel-1 Level-2 Ocean (OCN)

## Sources
- [sentiwiki-s1-products] | Sentinel-1 products, SentiWiki Copernicus | https://sentiwiki.copernicus.eu/web/s1-products | tier=agency-doc | accessed=2026-06-11
- [s1-l12-rp-owi-spec] | Sentinel-1 Level-2 OCN OWI product specification, ESA/EOPF | https://s1.pages.eopf.copernicus.eu/s1-l12-rp/main/pfs/level_2_ocn_owi_product_specification.html | tier=operator-engineering | accessed=2026-06-11
- [cdse-s1-documentation] | Sentinel-1 data collections, Copernicus Data Space Ecosystem | https://documentation.dataspace.copernicus.eu/Data/Sentinel1.html | tier=agency-doc | accessed=2026-06-11

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Source: https://eo-atlas.org/data_products/sentinel-1-l2-ocn
Maintainer: SpectraWorks B.V. (CC-BY 4.0)