def MetersToPixels( mx, my, zoom):
	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
	res = initialResolution/(2**zoom)
	px = (mx + originShift) / res
	py = (my + originShift) / res
	return px, py