Bathymetry is the information that describes the topography of the seabed, as depth from the sea surface to the seafloor. It is an essential component in understanding the dynamics of the marine environment. Safe ocean navigation relies on accurate bathymetry data, which are also essential for planning marine installations and infrastructure such as wind turbines, coastal defences, oil platforms and pipelines. Bathymetry forms the foundation of any comprehensive marine dataset; without it, the picture is incomplete.
Objectives of EMODnet Bathymetry
EMODnet Bathymetry aims to provide a single access point to bathymetric products, Digital Terrain Models (DTM) and data (survey data sets and composite DTM) collected and managed by an increasing number of organisation from government and research scattered over Europe
Key services provided by EMODnet Bathymetry
The EMODnet Bathyemtry portal provides a range of services and functionalities to users for viewing and downloading bathymetry data products and for identifying and requesting access to the survey data sets that are used as basis input for the DTM. Currently the following key services and functionality are provided for users:
- Data Discovery and Access service: provides functionality to search and obtain survey data sets;
- Composite Products Discovery and Access service: provides functionality to search and view metadata of composite DTM;
- Bathymetry Viewing and Download service: provides functionality to view, browse and download digital bathymetry as DTM and obtain information about the underlying data sets used to compile the DTM.
The following approach has been adopted for the implementation of the EMODnet Bathymetry portal:
- Develop a Bathymetry Viewing and Download service on top of a powerful spatial database including various ways for browsing and interacting with the EMODnet Bathymetry digital terrain model and associated metadata by means of information layers and specific functions. It includes WMS, WCS and WFS services (OGC) to share layers also with other portals such as other EMODnet portals, the European Atlas of the Seas, and external portals;
- Involve research institutes, monitoring authorities, and Hydrographic offices, in providing bathymetric data sets, only for internal use by project partners for producing Digital Terrain Models (DTM) with specific resolution for each geographical region. The DTM's are loaded and integrated into the portals' spatial database, and made available for free downloading as tiles;
- Include in the portal a metadata data discovery and access service, by adopting the SeaDataNet CDI metadata standard, for providing clear information about the survey data used for the DTM, their access restrictions and distributors, and featuring online shopping request and delivery; this ensures that the bathymetry data sets can also be queried at the SeaDataNet portal.
- Include in the portal an additional catalogue service, by adopting the SeaDataNet Sextant Catalogue service, for providing metadata on composite DTMs that are contributed by a number of data providers next to or instead of bathymetric survey data.
The partners of EMODnet Bathymetry combine expertise and experiences of collecting, processing, and managing bathymetric data, together with expertise in distributed data infrastructure development and operation and providing of discovery, access and viewing services according to INSPIRE implementation rules and international standards (ISO, OGC).
For the purpose of collecting hydrographic data sets, such as multibeam surveys from scientific cruises, several types of hydrographic data providers were engaged.
EMODnet Bathymetry product development
Digital Terrain Model are based on 3 types of bathymetric data sources.
- Bathymetric surveys, such as single and multibeam surveys, echosoundings and even historic leadline soundings. These data sets are most preferred as data sources because of their high resolution.
- Composite data sets, giving a gridded bathymetry, provided by Hydrographic Offices (HO’s) from the Digital Terrain Models that they maintain themselves for producing and maintaining their nautical charts following international IHO procedures.
- Gaps with no data coverage are completed by integrating the GEBCO Digital Bathymetry
Improvements in the current development Phase III (2017-2020)
- Multi-resolution DTM (¼ of an arc minute);
- Satellite Derive Bathymetry (SDB) data will be utilised to cover gaps.
- Extended coverage to include European coastal zones as well as the European Arctic region and Barentz sea