Bing Satellite layer

[vladimir-rybalko]

I'm trying to add a Bing Satellite layer to the itowns map project. The tile request template uses the quadtree key. Its calculation is based on values ZXY. https://ecn.t0.tiles.virtualearth.net/tiles/a{quadkey}.jpeg?g=587&mkt=en-gb&n=z

As an example, openlayers has a method tileUrlFunction to get the URL of a tile given its coordinates and projection.

How can I define a url template in iTowns for Bing Satellite layer?

[jailln]

The equivalent to openlayers' tileUrlFunction in itowns is urlFromExtent. It is however not configurable as in openLayers.

I think that one quick solution would be to override the tileUrlFunction of the TMSSource to use determine the url based on quadtree key.

I think that one better solution would be to:

• Add a parameter to TMSSource (e.g. useQuadkeyUrl)
• Implement a method (e.g. xyzQuadKey) in UrlBuilder.js that returns builds an url based on quadtree key
• In TMSSource.urlFromExtent, when useQuadkeyUrl is true, call UrlBuilder.xyzQuadKey instead of URLBuilder.xyz

That will make quadtree key url templates available to all users to itowns. It would be very valuable if you could make this contribution to itowns.

To go further and make it more configurable, we could also implement a similar mechanism than openLayers and add a tileUrlFunction (or equivalent) parameter to TMSSource and use it in urlFromExtent if it's provided in the source declaration.