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https://maps.six.nsw.gov.au/arcgis/rest/services/public/NSW_5M_Elevation/ImageServer/WMTS/1.0.0/WMTSCapabilities.xml is some elevation data of interest to me.

In QGIS, I've set that up as a WMTS layer, but what do I need to do to visualize it, for example as grey scale?

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    just to make things clear in case they aren't: a WMTS serves image tiles that are pre-rendered on the server; you won't be able to style those tiles (e.g. make it a greyscale when it's not) based on meta data (like elevation), since it's not existent in the images. apart from that, as @nielsgerrits stated, that service doesn't serve anything...
    – geozelot
    Sep 4, 2019 at 8:38
  • Thanks for this ... but given maps.six.nsw.gov.au/arcgis/rest/services/public/… is an "elevation service", surely the elevation info is available to be used somehow?! What I'd really like to do is compute a viewshed by using this as the DEM for the Visibility Analysis plugin (so visualizing as a grey scale may have been a red herring, sorry). Sep 5, 2019 at 1:03
  • I know it seems so logical...but here, 'service' is a resource access and transfer protocol standard, and WMTS only serves image tiles, with RGB color values for each pixel. it's absolutely possible to encode elevation info into the RGB range (e.g. Mapbox has a high res DEM encoded Terrain tile service), but you'd need specialized tools to decode and use that data. above that, I doubt ESRI would happily provide a public service with their proprietary (and rather expensive) elevation data, but I wouldn't know. still, you are better off looking for sources to acquire the meta data yourself.
    – geozelot
    Sep 5, 2019 at 8:41

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I think this is a server side issue. The ImageService is probably not cached, so no tiles available.

It does work for the basemap. If you query a raw tile it returns a valid image: https://maps.six.nsw.gov.au/arcgis/rest/services/public/NSW_Base_Map/MapServer/WMTS/tile/1.0.0/public_NSW_Base_Map/default/GoogleMapsCompatible/14/9856/15047.png

Where the imageservice returns an empty one: https://maps.six.nsw.gov.au/arcgis/rest/services/public/NSW_5M_Elevation/ImageServer/WMTS/tile/1.0.0/public_NSW_Base_Map/default/GoogleMapsCompatible/14/9856/15047.png

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