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In case you're wondering what this is about: the scale of Wikipedia makes it difficult to just drop in a third-party OSM tiling service, so they're rolling their own map rendering process using OSM data. This is a beta of the rendered tiles, displayed inside Leaflet.

If you're into maps and this kind of thing, I highly recommend checking out LocalWiki (https://localwiki.org) too!

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Is their rendering process documented anywhere?

Yes. From https://www.mediawiki.org/wiki/Maps#Production_maps_cluster:

The implementation [1] has various components including:

* Kartotherian [2]: a server capable of providing map tiles in vector (pbf) or raster (png) formats, as well as static map snapshots of any size for a given location.

* Tilerator [3]: a distributed backend tile generation service with a jobque

* A flexible sources [4] system to set up the needed storage and processing pipeline

1. https://www.mediawiki.org/wiki/Maps/Tile_server_implementati...

2. https://github.com/kartotherian/kartotherian/

3. https://github.com/kartotherian/tilerator/

4. https://github.com/kartotherian/kartotherian-core/

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