def GoogleTile(self, tx, ty, zoom):
		
		# coordinate origin is moved from bottom-left to top-left corner of the extent
		return tx, (2**zoom - 1) - ty
Create a dataset
dataset/ETHPy150Open Ecotrust/create-utfgrids/globalmaptiles.py/GlobalMercator.GoogleTile--crossover with--dataset/ETHPy150Open NVIDIA/DIGITS/digits/dataset/images/generic/test_views.py/BaseViewsTestWithImageset.create_dataset