[openstreetmap/openstreetmap-website] Change low zoom projection from Mercator to Globe/Sphere (#2604)

[Seth Deegan]

> Reading through this I see you are suggesting using merkator tiles on a globe, the whole point of merkator is that it is flat and this wouldn't work too well.

But it does work currently, which is honestly great. Also, if we were to use Leaflet as a fallback, merkator tiles would still have to be generated.

> Making a 3D globe to me would be something done with vector tiles, after those have become available.

I love vector tiles too. I suggested using 3DTiles (Standard: https://www.ogc.org/standards/3DTiles Possible Renderer: https://github.com/Geodan/pg2b3dm ) for the globe as well. 

I'm not sure how hard implementing 3DTiles would be though (API supports lad/long but not height, idk what osm-carto would do, you'd probably need to look more into the renderer).

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