WMTS arcgis support

[tom-butler]

• datacube-wms version: latest
• Python version: 3.6.7
• Operating System: Ubuntu (opendatacube/wms:0.8.5-unstable.8.g116163a)

Description

WMTS doesn't support the tilematrixset used by arcgis online 'WholeWorld_WebMercator'

What I Did

1. Loaded https://ows.services.devkube.dea.ga.gov.au/wmts into arcgis online
2. Selected ls8_barest_earth_mosaic layer

Inspecting the network requests show that arcgis uses the following request

https://ows.services.devkube.dea.ga.gov.au/wmts?SERVICE=WMTS&VERSION=1.0.0&REQUEST=GetTile&LAYER=ls8_barest_earth_mosaic&STYLE=simple_rgb&FORMAT=image/png&TILEMATRIXSET=WholeWorld_WebMercator&TILEMATRIX=8&TILEROW=144&TILECOL=231

This fails with Service Exception: Invalid Tile Matrix Set: WholeWorld_WebMercator

For comparison a working request from nationalmap is

https://ows.services.devkube.dea.ga.gov.au/wmts?tilematrix=9&layer=ls8_barest_earth_mosaic&style=simple_rgb&tilerow=301&tilecol=450&tilematrixset=urn%3Aogc%3Adef%3Awkss%3AOGC%3A1.0%3AGoogleMapsCompatible&format=image%2Fpng&service=WMTS&version=1.0.0&request=GetTile

It'd be cool if WMTS worked out of the box with arcgis online (for story maps etc)

[SpacemanPaul]

Hmm. That's odd. They are actually the same tile matrix sets.

I'll have a look at it. Probably a quick fix.

Edit: Yes, it's a one line fix. Let me just check the spec first to see if this goes in the "ways I have misread an OGC spec" pile or the "ways ESRI has misread an OGC spec" pile.

[SpacemanPaul]

Yep. Such a trivial one-liner I didn't even bother to do a PR. Latest commit should fix it. Let me know if it doesn't.