def MetersToLatLon( mx, my ):
	import math
	tileSize = 256
	initialResolution = 2 * math.pi * 6378137 / tileSize
	# 156543.03392804062 for tileSize 256 pixels
	originShift = 2 * math.pi * 6378137 / 2.0
# 20037508.342789244
	lon = (mx / originShift) * 180.0
	lat = (my / originShift) * 180.0
	lat = 180 / math.pi * (2 * math.atan(math.exp(lat * math.pi / 180.0)) - math.pi / 2.0)
	return lat, lon