def PixelsToTile(self, px, py):

		tx = int( math.ceil( px / float(self.tileSize) ) - 1 )
		ty = int( math.ceil( py / float(self.tileSize) ) - 1 )
		return tx, ty
Returns a tile covering region in given pixel coordinates
dataset/ETHPy150Open Ecotrust/create-utfgrids/globalmaptiles.py/GlobalMercator.PixelsToTile