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I am trying to add tiles from a GeoServer instance (using GeoWebCache) as an XYZ layer to a QGIS project.

The demo map on the server is here:

https://gis.lmi.is/geoserver/gwc/demo/LMI_Kort?gridSet=EPSG:3857&format=image/png

There are at least two URLS where I can access tiles individually:

The server also provides a TMS endpoint: https://gis.lmi.is/geoserver/gwc/service/tms/1.0.0

I have tried variations of each of those as XYZ sources in QGIS, substituting {z}, {x} and {y} in the place of 9, 408 and 299. I have also tried {-y}, to see if that works. The projection for the project is 3857. In all cases, I can add the layer to QGIS but nothing happens on the map canvas.

What is the correct connection string to use?

Note: I am able to add the layer as WMTS, but there are issues with the rendering. I wanted to see if XYZ tiles would be better. See Image quality and aliasing effects in GeoWebCache WMTS tiles in QGIS for details.

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2 Answers 2

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You need to use this URL https://gis.lmi.is/geoserver/gwc/service/wmts?Service=WMTS&Request=GetCapabilities&Version=1.0.0

For a WMTS, you need to replace after the base URL (all the url before ?) the string with the following Service=WMTS&Request=GetCapabilities&Version=1.0.0

So, in your case, https://gis.lmi.is/geoserver/gwc/service/wmts?layer=LMI_Kort&style=default&tilematrixset=EPSG%3A3857&Service=WMTS&Request=GetTile&Version=1.0.0&Format=image%2Fpng&TileMatrix=9&TileCol=299&TileRow=408 becomes https://gis.lmi.is/geoserver/gwc/service/wmts? and after adding the end with my first instruction, you get at the end https://gis.lmi.is/geoserver/gwc/service/wmts?Service=WMTS&Request=GetCapabilities&Version=1.0.0

You paste the URL by going to menu "Layers" > "Add Layer" > "Add WMS/WMTS Layer" > "New" (if you did not already configure "something") and fill the content with the previous URL (see screenshot) and click "OK"

WMTS configuring in QGIS

Then, "Connect" to get a list of layers like below screenshot. Choose one, "Add" and you will see the layer

WMTS layers list

End result in QGIS

QGIS layers demo

PS: except I've illustrated with your case, my answer covers more or less what is in the QGIS WMTS doc https://docs.qgis.org/3.16/en/docs/user_manual/working_with_ogc/ogc_client_support.html#wms-wmts-client. Feel free to visit it as it may help you to better understand

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    Thank you for taking the time to write this detailed answer. I was already able to add the layer as a WMTS, my problem was that there were problems with how it was rendered. This was why I wanted to try the tiles directly. In the end, I solved the problem with the "Zoom to Native Resolution" function on the WMTS layer. See here for details: gis.stackexchange.com/a/375135/64762
    – Dr John A Stevenson
    Jul 14, 2021 at 13:27
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The answer seems to be here under "Fonction projecion de Mercator" : http://randochartreuse.free.fr/mobac2.x/mapsources/Islande/Islande-LMI_Kort.bsh

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