The EMODnet Bathymetry World Base Layer (EBWB) service is a gridded representation of worldwide bathymetric and topographic coverage adapted for a better representation of seabed morphological features. Based on modern WMTS schema, it allows a fluid and powerful rendering. For the global oceans EBWB1 is composed of the 2018 EMODnet Bathymetric grid around Europe (approx. 100m resolution) and uses the GEBCO 2019 grid (approx. 500m resolution) elsewhere in the marine environment. Land coverage is based on a combination of 30 arc second ASTER GDEM, SRTM3, EU-DEM, and Global 1 second world-wide water body map for the topographic part. This compilation of publicly available data sources have been merged and pre-tiled for rendering, at 10 levels of zoom starting from 1/24th of an arcminute (approx. 75m resolution). The EBWB1 service is available in non-projected system (Lat, Long, WGS84: EPSG:4086), Web Mercator (EPSG:3857), Inspire compliant ETRS-EALA projection (EPSG:3035) and projections adapted to both poles (ESPG 3031 and 3996) Service URL: https://tiles.emodnet-bathymetry.eu/wmts/1.0.0/WMTSCapabilities.xml

DTM data source was created by taking contour lines and spot soundings from Norwegian Electronic Navigational Charts. NOTE: Data east of appr.

Maas West Outer Vlissingen, South part. There are sand waves. Surveyed by one of the Hydrographic Survey Vessels of the Royal Netherlands Navy.

This composite Digital Terrain Model (cDTM) is a high resolution bathymetry dataset that covers GEOMARGEN-2 surveys. Multibeam data acquired in 2013 on board the R/V Angeles Alvariño with a Kongsberg EM710 echo-sounder

Systematic survey performed by Italian Navy Hydrographic vessels with Multibeam EchoSounder

The composite Digital Terrain Model of the Central Bulgarian Black Sea Slope is a result of processing and compilation of multibeam echosounder data gathered under several projects: the Caucasus on-line cable route survey (2007); The South Stream pipeline route survey (2009-2012); CBC Programme “MARINEGEOHAZARD” (2012). The DTM at a source resolution of approximately 55 meters was compiled for inclusion into the EMODnet HRSM dataset. The area embraces 2675 square kilometers from the shelf break to the abyssal plain in the center of the Bulgarian EEZ of the Black Sea.

This data set consists of a bathymetric grid derived from multibeam bathymetry data from cruise JC071. The bathymetric grid was created by gridding cleaned raw multibeam data from JC071 at 1/64 arc-minute intervals. The data set covers an approximate one degree square with the minimum and maximum longitude and latitude co-ordinates: 17.016667W-16.216667W; 48.78333N-49.28333N. This is located in the Northeast Atlantic Ocean area. The data were collected from 7th-8th May 2012 using an EM120 Multibeam Echo-sounder. The cruise was part of the Porcupine Abyssal Plain (PAP): sustained ocean observation project. The bathymetry data were collected on an opportunistic basis during the cruise. The cruise was operated by the National Oceanography Centre (NOC), equipment operated by National Marine Facilities Sea Systems. The bathymetric grid was created by BODC for contributing to the EMODnet HRSM Project.

Data provides Satellite-Derived Bathymetry (SDB) data for shallow waters. The analysis is based on EOMAP’s WATCOR-X SDB software and Sentinel-2 data. The native spatial resolution of the data is 10m. Supplemental_Information: EOMAPs Satellite Derived Bathymetry (SDB) method relies on the reflected light energy which is measured at the satellite sensor in space. To calculate water depth, the sea bottom reflection must be separated from all other simultaneously measured portions of light. Other contributors of light scattered to the sensor are atmospheric molecules and aerosols, adjacent scattering from land, the water surface reflection, and light scattered and absorbed due to particular properties of water constituents and the pure water itself. The pure water itself also absorbs light in a spectrally specific manner and therefore leaves unique signatures in the signal while the light passes through the water column and returns after reflection at the sea bottom. This property is relevant to estimate water depth from optical satellite imagery. As many properties can vary over space and time, effective correction, regularization and retrieval algorithms must be applied to avoid instable results. Furthermore, multi-record analytics are part of the process and reduce noise and increase overall vertical accuracies. EOMAP developed and maintains these unique algorithms and its workflows for almost 2 decades and has developed the Watcor-X SDB software. The maximum depth the system is able to sense is related to the complex interaction of radiance of bottom material, incident sun angle and intensity, and the type and quantity of organics or sediments in the water column. As a rule-of-thumb, SDB can measure depths down to one to one point five times the Secchi Disc Depth. The SDB data are compared against Satellite-Lidar Bathymetry (SLB) tracks which have been derived out of the IceSat-2 Atlas instrument and are stored and distributed via EOMAP’s SLB database. No-data-value optically deep water: -9999

Multibeam data acquired in 2007 during the SVAIS cruise on board the R/VHespérides with a Simrad EM12 echo-sounder

This composite Digital Terrain Model (cDTM) is a high resolution bathymetry dataset that covers CASCADES-I, CASCADES-II, COSTEM-1, COSTEM-2, COSTEM-3, COSTEM-4, FORMED-2, FORMED-4 and FORMED-6 cruises. Multibeam data acquired in 2008, 2009, 2010, 2011, 2013, 2014 and 2015 on board the R/V Sarmiento de Gamboa and the R/V García del Cid with an Atlas Hydrosweep DS-3 and an Elac Seabeam 1050D echo-sounder.