Chemistry

Data & products on marine water quality

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:

GetCapabilities

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)

GetMap

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.

GetFeatureInfo

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 product 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.

OPeNDAP endpoint: http://ec.oceanbrowser.net:8081/data/emodnet-domains/

Marine litter products

Viewing service

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

https://www.ifremer.fr/services/wms/emodnet_chemistry2

Downloading service

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

https://www.ifremer.fr/services/wfs/emodnet_chemistry2

Contaminants products

Viewing service

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

https://nodc.inogs.it/geoserver/Contaminants/wms

Downloading service

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

https://nodc.inogs.it/geoserver/Contaminants/wfs

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:

https://sextant.ifremer.fr/geonetwork/srv/eng/csw-EMODNET_Chemistry

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: https://geo-service.maris.nl/emodnet_chemistry/wms
WFS service: https://geo-service.maris.nl/emodnet_chemistry/wfs