Add support for limited concurrency XYZ downloads, and Mapbox maps#11
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Goal
This PR adds two options for online sources:
mapboxfor any custom Mapbox style, andmapbox-satellite, which is Mapbox's satellite imagery style. Both require an access token (and the CLI raises an error if either option is selected without one.)Additionally, this PR introduces
p-limitto be able to do concurrent downloads of XYZ tiles with Promise.all without running into rate limiting from any API (Bing, specifically). A limit of 5 seems to work fine and still substantially speed things up compared to individual image downloads async.Screenshots
XYZ tiles from a Mapbox style