tile
Calculates the Bounding Box coordinates for a Slippy Tile with a given zoom level.
Return
A bounding box object that contains coordinates for West/South/East/North edges or min Lon / min Lat / max Lon / max Lat.
Parameters
x
X of the slippy tile name.
y
Y of the slippy tile name.
zoom
Zoom level of the slippy tile name.