EMODnet Bathymetry - World Coastline version 2020

The EMODnet Bathymetry World Coastline is available as a WFS service from EMODnet Bathymetry. The service URL is: https://ows.emodnet-bathymetry.eu/wfs. The layer contains vector lines derived from land polygons available from OpenStreetMap. The original source url is https://osmdata.openstreetmap.de/. Parts of these polygons have been modified for use in EMODnet Bathymetry .

In addition to the OSM EMODnet default coastline, three sub-layers are available as part of the EMODnet world coastline service. These sub-layers contain the best-estimate coastlines for Europe determined by Dutch research institute Deltares from satellite data (typically Sentinel-2 and Landsat-8) and in combination with the Global Tide Surge Model (GTSM) processed into digital coastlines for the European seas at LAT (Lowest Astronomical Tide), MSL (Mean-Sea-Level), and MHW (Mean-High-Water). The level of detail is bound to the resolution of the satellite sensor (e.g. 10m for Sentinel-2). The latest December 2020 version now covers the entire coastline of Europe.

A detailed paper is available describing the methodology used to determine the three versions of the satellite derived coastline:

https://emodnet.ec.europa.eu/sites/emodnet.ec.europa.eu/files/public/20201219_emodnet_bathymetry_satellite_derived_coastline_report.pdf

Date (Publication): 2021-01-15

Citation identifier: EMODnet_Bathymetry_coastliines

Point of contact

Organisation name	Individual name	Electronic mail address	Role
EMODnet Bathymetry consortium		webmaster@shom.fr	Publisher
Deltares		info@deltares.nl	Author

Thèmes Sextant

/Physical Environment/Physiographic Limits/Shoreline

GEMET - INSPIRE themes, version 1.0

Land cover

Access constraints: Creative Commons Attribution 4.0 International

Use constraints: Other restrictions

Other constraints: DO NOT USE FOR NAVIGATION

Spatial representation type: Vector

Language: English

Character set: UTF8

Topic category

Oceans
Boundaries

Distribution format

Name	Version

OnLine resource

Protocol	Linkage	Name
WWW:LINK	https://tiles.emodnet-bathymetry.eu/	EMODnet Bathymetry WMTS service
WWW:LINK	https://emodnet.ec.europa.eu/geoviewer	EMODnet viewer
WWW:DOWNLOAD	https://downloads.emodnet-bathymetry.eu/v10/EMODnet_Bathymetry_2020_coastlines.zip	EMODnet_Bathymetry_2020_coastlines
OGC:WMS	https://ows.emodnet-bathymetry.eu/ows	coastlines

OnLine resource

Protocol	Linkage	Name
DOI	https://doi.org/10.12770/4a1dbf4b-e3f3-4983-aa54-a0379f984887	Digital Object Identifier (DOI)

Hierarchy level: Dataset

Conformance result

Title: RÈGLEMENT (UE) N o 1089/2010 DE LA COMMISSION du 23 novembre 2010 portant modalités d'application de la directive 2007/2/CE du Parlement européen et du Conseil en ce qui concerne l'interopérabilité des séries et des services de données géographiques

Date (Publication): 2010-12-08

Explanation: See the referenced specification

Statement: The EMODnet World Coastline service includes:

• Satellite Derived Coastlines for European waters at different tidal elevations

• World Coastline, derived from OpenStreetMap (OSM)

Existing methods for surface water detection from multispectral satellite data use the fact that water significantly absorbs most radiation at near-infrared wavelengths and beyond. This fact makes it easy to detect clear water employing spectral indices, such as the Normalized Difference Water Index (NDWI). In EMODnet-Bathymetry, a NDWI algorithm is used to derive coastlines for the European waters from satellite imagery. This in combination with a tidal model allows, to retrieved coastlines at different vertical datum (Mean-Sea-Level (MSL), Mean-High-Water (MHW), and Lowest Astronomical Tide (LAT)). Huge volumes of satellite data have been processed in parallel using a mixture of top-of-atmosphere reflectance satellite images from NASA/USGS Landsat 8 and ESA Sentinel-2 satellite missions, acquired during 2013-2020. For the correction for sea level variation use has been made of the Global Tide and Surge Model (GTSMv3.1) from Deltares, which provides instantaneous water level and tide levels with global coverage. More detailed information can be found in:

https://emodnet.ec.europa.eu/sites/emodnet.ec.europa.eu/files/public/20201219_emodnet_bathymetry_satellite_derived_coastline_report.pdf

The Satellite Derived Coastlines are available for download as shape files and included in the Coastlines map layer on the EMODnet Central Map Viewer, and included in the EMODnet Bathymetry OGC WMS service.

OpenStreetMap (OSM) is a collaborative project to create a free editable map of the world. The geodata underlying the map is considered the primary output of the project. The creation and growth of OSM has been motivated by restrictions on use or availability of map data across much of the world, and the advent of inexpensive portable satellite navigation devices. OSM is considered a prominent example of volunteered geographic information.

The land polygons describe polygons for all land areas in the world, ie. continents and islands. Optionally, large polygons are split into smaller overlapping chunks that are easier and faster to work with.

The data has been derived from OpenStreetMap ways tagged with natural=coastline. Ways are assembled into polygons and then split. Some errors in the OSM data are repaired in the process. Where polygons have been split they overlap slightly to help avoiding rendering artefacts at the seams.

The OSM derived world coastline is included in the Coastlines map layer on the EMODnet Central Map Viewer, and included in the EMODnet Bathymetry OGC WFS service.