High DPI Bing Imagery

[kring]

It's not well documented, but Bing Maps supports high-DPI labels on the Roads and Aerial with Roads layers. The way it works is we add &dpi=d1 to the tile request URL, and we get back a tile that is identical imagery-wise but has labels rendered at twice their normal size. Then, we just need to request 4x the tiles and make them half the size we would have before, i.e. map 4x the imagery tiles to each terrain tile. Or request four tiles where we would have requested 1 before and combine all four 256x256 images into a single 512x512 texture.

Normal tile: https://t0.ssl.ak.dynamic.tiles.virtualearth.net/comp/ch/3112301330020332?n=z&mkt=en-US&it=A%2CG%2CL&src=t&og=1218
High DPI tile: https://t0.ssl.ak.dynamic.tiles.virtualearth.net/comp/ch/3112301330020332?n=z&mkt=en-US&it=A%2CG%2CL&src=t&og=1218&dpi=d1

Source: digidem/leaflet-bing-layer#32