Data & products on marine water quality

Dear User, the EMODnet Chemistry portal will soon be integrated into our new EMODnet Central Portal, which will provide continued, open and free access to our data and information services with unique new features. By providing a Centralised EMODnet service, we aim to help you optimise your research and work.

You can preview our new unified content, document search facilities and unified data catalogue via the EMODnet Product Catalogue.

The new and optimised common map viewer will be launched in November 2022.

Follow us on Twitter @EMODnet for the latest news on our centralisation process and new features.

For any questions or comments, you can contact us here.

Web Services

Eutrophication products

Viewing service

The analysed field generated by DIVA (Data-Interpolating Variational Analysis) can be visualised using the WMS protocol which supports the following requests:


This request is used to provide all layers of the map server. To every parameter and to every region corresponds a different WMS layer. ( Example URL)


This request allows to extract a horizontal section of the 4D NetCDF file at the specified depth and time. ( Example URL)

Per default, the axis are not displayed on a map. This can be activated by setting the parameter DECORATED to true. ( Example URL)

The GetMap can also be used to extract a vertical section. The path of the section is encoded in the SECTION parameter: the longitude and latitude are separated by a comma and the coordinates by the pipe-symbol (|). The x-axis corresponds to the distance in arc degrees along the section (the first point is the origin) and the y-axis in the depth in meters. The parameter RATIO defines the aspect ratio of the vertical section.

Images can be returned in raster (PNG) and vector image formats (SVG, EPS, PDF). They can also be saved as a KML file so that the current layer can be visualized in programs like Google Earth and combined with other information imported in such programs. By providing multiple time instances, the web map server can also return animation in the WebM or MP4 format using this GetMap request ( Example URL). As the animation are generated dynamically, it usually takes a couple of minutes to create them. The frame rate of the animation is controlled through the parameter rate.


This request returns a simple XML file with the underlying value of the analysed field. ( Example URL)

However, the WMS standards (in version 1.1.1 and 1.3.0) are not completely adequate for ocean analyses. A WMS allows to represent a data set according a list of different styles. A legend is attributed to each style which for scalar is colorbar. The legend for a given style is represented by a link to an image. A single legend is used for entire data set (for all depth layers and time instances in particular). However the ocean is strongly stratified and unique legend does not provide sufficient contrast because the ocean properties at depth are often very different from the properties near the surface. The solution is to make the legend dynamic so that it can be adjusted based on a range of value at a specified depth and time.

Downloading service

OPeNDAP allows one to download and subset gridded datasets. The OPeNDAP protocol is nowadays included in the netCDF library so that most programs able to read netCDF files can also access remote datasets over OPeNDAP and download only the actual required data subset.

We use THREDDS Data Server as OPeNDAP server. The catalogue is available at , and also as XML at .

Marine litter products

Viewing service

All the marine litter products generated during the project can be visualised using the following WMS endpoint:

Downloading service

All the marine litter products generated during the project can be downloaded using the following WFS endpoint:

Contaminants products

Viewing service

All the marine contaminants products generated during the project can be downloaded using the following WFS endpoint:

Downloading service

All the marine contaminants products generated during the project can be downloaded using the following WFS endpoint:

Products discovery service

The Products Catalogue service allows users to search for one or more available products and retrieve the full set of metadata, their access restrictions, originators and distributors. It is integrated with the Product Viewing service, is compliant with ISO 19139 metadata standards and fulfils INSPIRE Directive requirements. This catalogue uses the following CSW endpoint:

CDI data discovery and access service

The CDI service has WMS and WFS services which are used primarily internally and by the OceanBrowser service for providing a layer of CDI entries and option for retrieving CDI metadata.

WMS service:
WFS service: