UTFGrid

UTFGrid parameters:
Center:     {"x": 121.51 ,"y": 31.13 }
Scale:     0.000007257907
View bounds:

•     Left bottom: {"x": 121.47 , "y":31.09 }
•     Right top : { "x": 121.56 , "y":31.17}

•   Width: 256
•   Height: 256
•   PixcelCellCount: 8