Understanding the topography of the European seas

Bathymetry Viewing and Download service

User Help

This Bathymetry Viewing and Download service provides various ways for browsing and interacting with the EMODnet Digital Terrain Model (DTM) and associated metadata by means of information map layers and specific functions per active layer. It also features a number of additional map layers with information which is relevant for the bathymetry domain. It is assumed that the user has a basic familiarity with geo-spatial tools and terminology.

The current EMODnet digital terrain model (DTM) itself has been created at a resolution of 0.125 arc-minutes using the best available bathymetry data sets from an increasing number of data providers. However despite this there are still areas where high quality bathymetry data is not available or could not be obtained. To prevent gaps in the EMODnet DTM layer, these areas have been filled with the GEBCO 2014 data.


Although the bathymetry available is based on the best available bathymetry and every effort is made with respect to the quality assurance and quality control, it should be noted that, accuracy, completeness, reliability, usability or suitability of the bathymetry cannot be guaranteed. Therefore the data products available from this service are not to be used for navigation or for any other purpose relating to safety at sea. EMODnet assumes no responsibility for incorrect results or damages resulting from the use of the data.

Browser support is given from Firefox 35, Chrome 40, IE 11, all under Windows 7, Windows 8 and Windows 10, and Safari 7.1, Firefox 35, Chrome 40 under OS X. Older browsers might experience problems due to the used technologies.

Table of Contents

What the Bathymetry Viewing and Download service provides

This service provides bathymetric data products for the European sea regions in an area specified by the EMODnet project. This covers the Norwegian Sea, Icelandic waters, Celtic Seas, Western Approaches, North Sea, Kattegat, Baltic Sea, English Channel, Bay of Biscay, Iberian Coast, West and Central Mediterranean, Adriatic Sea, Ionian Sea, Aegean Sea, Levantine Sea, Sea of Marmara, Black Sea, the Azores, Canary Islands and Madeira. The data product is provided in one eight arc minute grid, so data points are roughly 230 meters apart.

The bathymetric data product can be downloaded in different formats. Currently the following formats are supported: native EMODnet csv, ASCII xyz, Esri ASCII grid, EMODnet NetCDF, GeoTIFF and QPS SD (Fledermaus). The EMODnet csv file is available with and without GEBCO and interpolated (INT) values. The download is divided over 16 tiles. Apart from downloading bathymetric data products the service provides information regarding point depth, transects and metadata of the underlying surveys. The EMODnet bathymetric data product is based on survey data and composite digital terrain models of hydrographic organizations and research institutes (a complete overview of the contributing organizations and partners can be found at the EMODnet bathymetry website). The survey data itself are not directly available but the related EMODnet Bathymetry CDI Data Discovery and Access service provides facilities for identifying and requesting access to survey data sets. The used composite DTMs are described in the Sextant Catalogue Service.

There are areas that are not covered by surveys or composite DTM"s. These areas have been filled with data available from GEBCO 2014.

The Bathymetry Viewing and Download service also provides a source references layer with metadata for the detailed survey data and composite DTM"s as used for the EMODnet bathymetry data product.

Bathymetry viewing and download service interface

Using the service

Using the service will address the layer panel, adding a layer yourself and using the available tools in the user interface.

Use interface layout

The service provides essentially a bathymetric map. There are several layers and these layers, when activated, can have specific functions which are displayed in the top bar by buttons.

Layers panel

The layers panel is the main control for choosing what kind of information you would like to examine. Although many layers can be made visible at the same time, only one layer can be active. The active layer determines the behaviour and corresponding functionality. The layer list can be selected by clicking on the down arrow of the left selection list in the function bar. Every layer has the following properties:

Layers panel

Adding a layer

In addition to the available layers you can add layers yourself. Click on Add layer to initiate the process of adding a WMS layer. Complete the following steps:

Make sure the added layer is based on WGS84. WMS Layers based on projections are not supported.

Using the general tools

The following tools are available:

Then depending on the active layer additional tools and functions will be available. These tools and functions will be explained below in the context of specific layers.

Continuing from the last session

If your browser supports HTML5 storage the user defined WMS layer(s) and predefined WMS layer settings as well as the zoom level and pan position are stored. When starting a new session the portal will be initialized with these settings. When a browser option like clearing session data when closing a tab or browser is active, the session settings are lost.

Using the Data product

The Bathymetric data product

The EMODnet data products are based on the continuous average depth grid of one eight arc-minute. This grid is based on two source types: Individual bathymetric surveys and composite digital terrain data (cDTM). The latter has been used whenever the actual survey data was unavailable for direct processing by the EMODnet partners. Whenever survey data and cDTM data were unavailable GEBCO data has been used to fill in the gaps.

Different layers of bathymetric data are available:

The following information can be retrieved from the active depth layers by additional function buttons:

The Source references layer

This layer depicts the most significant elementary surface used for generating the grid cell value. The minimum resolution for this layer is 5 EMODnet grid cells in order to prevent too much detail in this layer. For every 5 EMODnet grid cells the most significant elementary surface has been determined. All neighbouring source reference "points" with the same reference are represented by a single polygon. Every polygon has its own fill colour. All polygons referencing the same source have the same fill colour. Be aware that one colour is not referencing the same unique source, since this would require more than 6.000 different colours. The only exception is that a grey fill colour always references a GEBCO source.

Source reference

The Survey tracks / polygons layer

This layer is provided as WMS by the EMODnet Bathymetry CDI Data Discovery and Access service. It shows all survey tracks and polygons for which survey data is available in the service, and not only those that have been used for the EMODnet Bathymetry data product. Also this has a global coverage.

Survey tracks

Download products

Download products tool

The Download products button is always visible and allows you to select and download EMODnet Bathymetry DTM tiles in various formats. Clicking on the button will display a grid of 16 tiles over the EMODnet Bathymetry area. Then clicking on one tile will open a pop-up window with a selection of download file types: EMODnet CSV, including the EMODnet data model and with or without GEBCO and interpolated (INT) gridcells, EMODnet NetCDF, ESRI ASCII, GeoTiff, Fledermaus SD, and XYZ files.

The file types have the following specifications:

Coastal areas with High Resolution bathymetry

This layer has been added in September 2015 to test the concept of a multi resolution product. High resolution data is available for the German North Sea coast, the French Mediterranean coast and Dunmanus bay in Ireland. Activating the layer will highlight these areas and the user is facilitated to zoom in further than in the overall bathymetry layers.

Additional layers

Several other layers are provided that are relevant for the bathymetry domain. These include:

OGC WMS, WFS and WCS services

The GIS layers in the Bathymetry Viewing and Download service can be shared as OGC services with other EMODnet portals and beyond. Also WMS layers from other EMODnet portals and external services can be added to the Bathymetry Viewer and Download service. The OGC services can be found at the following URLs:


More detailed information on these webservices can be found at the following page.


In addition to the data and products of EMODnet bathymetry partners use is made of the following sources:

Questions & Feedback

For questions and feedback please use the Feedback button of the portal. We would really like to know your findings and ideas on how the portal could be improved.

Configuration information

This help text is version 3.0 and released on 30 November 2017.

The Bathymetry Viewing and Download service is built and maintained by GGSgc and partners coordinated by MARIS and on behalf of the European Commission.