EMODnet Bathymetry - Source reference version 2022

The EMODnet DTM is comprised of tens of thousand individual datasets that are carefully selected and processed by the EMODnet Bathymetry team. In case datasets overlap the best possible solution is chosen to deconflict the overlap zone. As a result, the resulting EMODnet DTM is a patchwork of deconflicted individual dataset. The EMODnet source reference service is a graphical representation of this patchwork. It is based on a vector representation of all patches brought together in a topological non-overlapping network. The network is created based on a reverse engineering process using the DTM as input. To reduce the amount of noise in this network, the DTM has been reduced by a factor 5 before processing the network. As a result, small overlap with the detailed EMODnet coastline is possible. The same network is also used for the EMODnet Quality Index service. Each patch in the network defines a number of attributes: • Dataset name (reference to either SeaDataNet or Sextant) • Area_type (patch is part of an individual survey or part of a composite DTM) • Dataset id (internal EMODnet DTM number) The attributes are used in the EMODnet data portal to derive at an URL that gives access to the metadata service SeaDataNet of Sextant depending on the Area_type (i.e. the data layer is clickable). The colours used in the WMS are randomly generated and have no specific meaning other that to differentiate the patches from one another. The service is available in both WMS and WFS Service URL: https://ows.emodnet-bathymetry.eu/wfs