POLYGON ((117.5158784 23.7746333, 117.5158711 23.7747869, 117.5160957 23.7748334, 117.5160664 23.7752173, 117.5158411 23.7751474, 117.5157767 23.7753243, 117.5155329 23.7752807, 117.5154055 23.7751442, 117.5155434 23.7749648, 117.5156668 23.7746533, 117.5158784 23.7746333))