Add support for WMTS tile map service

WMTS is a service for georeferenced maps, served as image tiles. It’s very similar to the TMS specification, which is already supported.

It seems that the only change to the TMS tilesource implementation that’s needed to make it a WMTS implementation is this:

// Original TMS implementation (tmstilesource.js, line 128)
getTileUrl: function( level, x, y ) {
  var yTiles = this.getNumTiles( level ).y - 1;
  return this.tilesUrl + level + "/" + x + "/" + (yTiles - y) + ".png";
}

// Changed to...
getTileUrl: function( level, x, y ) {
  return this.tilesUrl + level + "/" + x + "/" + y + ".png";
}

Therefore I wonder if WMTS could be made a config option to the TMS tilesource?

[msalsbery]

Even DZI images have an XML “manifest” so I wouldn’t think that’s an issue…

I personally think all tile sources should be plugins so developers can just pull in the ones they use.

Very cool!

[rsimon]

Hi,

finally revisited this after a long time. In the end, I think it’s not possible to implement useful WMTS support purely with a tilesource.

1. WMTS have an XML “manifest” which needs to be loaded before, and which defines the properties of the tilesource.
2. there’s also the issue of dealing with geo-coordinates.

The first issue, I assume, could be handled somehow (after all, IIIF manifests work in a similar way). But because of the second issue, I thought this might be easier/better to handle via a plugin.

I made a first version here: https://github.com/recogito/openseadragon-wmts

Would be interested to hear your feedback!