Three tabs offer the user different functions without having to re-draw the main map page:
The Welcome tab is shown on entering the webpage, which gives an introduction to the interactive map.
All map layers are listed on this tab with the layers grouped into folders and subfolders. Clicking on a folder or subfolder will display the expandable list of layers within it; clicking the folder again will collapse the layers. Make a layer visible by clicking the check box next to its name.
Zoom to layer: Clicking this symbol will zoom the map to the full extent of the layer.
Toggle all layers: Clicking this symbol will make all the layers in that subfolder visible.
Download layer: If this symbol is visible next to a layer then it is downloadable. Click to download the layer.
Layer help: Hover over for a longer description of the layer, or click to get full layer metadata.
Set Filter: And alternative location for loading the set filter dialog (also accessible via the Toolbar), allowing the user to filter certain layers to only show records matching the selected criteria. Layers that are currently filtered by one or more criteria will appear blue in the Map Layers tab, with a preceding small blue filter symbol ().
Adding layer(s) from other mapping portals
Using the interactive map it is also possible to view layers from other online interactive maps, such as the other EMODnet portals. This is achieved by clicking on the Add layer(s) from other mapping portals link at the top of the Layers tab.
Portals can be chosen from the drop-down list, or if a Web Map Service (WMS) address is known, using the Custom... option. If the WMS server has arranged layers in groups, the Use layer groupings tick-box may be ticked to view the layers in a simpler format.
Layers will appear in a new folder below the permanent layer folders. Sliding bars beside the layer names allow the layer transparency to be changed.
This tab displays a key/legend for the map layers that are visible.