ReadonlylabelShort provider name (for logs / a layer picker).
ReadonlyattributionAttribution HTML that must be shown while this provider is on screen.
ReadonlymaxDeepest native zoom; deeper tiles 404, so draping clamps the mosaic to this.
ReadonlytileTile edge in px (256 for every standard slippy-map provider).
A Web Mercator (EPSG:3857) XYZ raster imagery source for draping over terrain.