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I have a problem when using WMS layers. I'm usin QGIS. I'm loading a WMS layer containing some aerial images. And then on top of it another WMS layer that contains information of the city, boundaries etc with labels. When I load the WMS layer with the labels, the background goes blank and I can't visualise the aerial images.

I've tried the same thing in Arc and works fine but I have to use QGIS.


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Can you give more information on the WMS services. For example what software are they being served by? – nmtoken Apr 28 '14 at 9:04
Combining different WMS in one project shouldn't be a problem, I just tested this in QGIS 2.2.0. But they need to share a common projection (you might have to choose the correct one manually from the list) – SAnderka Apr 28 '14 at 9:17
up vote 8 down vote accepted

This happens to me when I started using QGIS 2.x. I then realize that the default parameter for the image format was set on JPEG and thus not allowing transparency (and I couldn't see the layers below).

When you click on the Add WMS layer icon and open the window with the parameter for the WMS layers, you have a parameter called " image encoding" below the list of layers: just check the PNG option (PNG allows for transparency) and it should solve the problem of the background going blank (or rather being covered, as I suspect).

This will work if you don't have any other issues of course, especially related to projection systems .

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