Essentially, take the tiles at the highest resolution and stitch them together into a single image.
Mechanically, this isn't difficult, but the resulting image will be big and could have a substantial impact on the bandwidth budget. (Then again, it should be about the same as somebody viewing the entire map at the highest zoom level, so maybe we're talking no more than twice the current bandwidth.)
Essentially, take the tiles at the highest resolution and stitch them together into a single image.
Mechanically, this isn't difficult, but the resulting image will be big and could have a substantial impact on the bandwidth budget. (Then again, it should be about the same as somebody viewing the entire map at the highest zoom level, so maybe we're talking no more than twice the current bandwidth.)