def PixelsToMeters(self, px, py, zoom):

		res = self.Resolution( zoom )
		mx = px * res - self.originShift
		my = py * res - self.originShift
		return mx, my
Converts pixel coordinates in given zoom level of pyramid to EPSG:900913
dataset/ETHPy150Open Ecotrust/create-utfgrids/globalmaptiles.py/GlobalMercator.PixelsToMeters