Map overlay layer opacity

I think no. But are your maps included here? If yes, you can try this.

No my layers are not present in Leaflet-providers Thanks anyway for the reference. Maybe an option could be added in a future release of your plugin. Regards

Is your layer such a layer like WaymarkedTrails.hiking?

Hi
No the layers are from France’s mapping institute – the IGN. They include a river course shading overlay and an altitude shading overlay. They can be seen on the Geoportail : https://www.geoportail.gouv.fr/
Regards

I mean, you have a base layer and you can switch on and off the overlay layer.
But I see, you need an overlay layer with opacity, as you wrote.

Yes the system provides a base map layer (road maps or sat images). The overlay can be set up with fixed opacity on a map with no other controls. However, IGN also provides a control layer for use with Leaflet and their map layers. The specific slider control allows you to modify the opacity using a map control. On the example following (not a wordpress site : https://www.aphyllanthe.fr/randonnees/circuit.php?rkey=1000) you can see the overlays in action using the control on the upper right and selecting IGN elevations or Hydrography. regards

So like this, right?

Yes That looks good.

Installed since 2.2.3