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How to visualise an overlay of several layers ?

Add several data into your workspace (refer to How to do a research in the Explore Data Catalogue?)

On the selected layers area, click on the cog on one of the data you want to overlay, and select "Overlay with..." option. Check the data you want to associate with this layer and click on Apply.

An Visualization Overlay portlet is now displayed in the workspace.

By clicking on the layers icon on the map, you can choose to hide or show the desired layers and interact with its opacity, or with the order of the overlay.