UTFGrid

UTFGrid parameters:
Center:     {"x": 121.71 ,"y": 31.14 }
Scale:     0.000004168508
View bounds:

•     Left bottom: {"x": 121.64 , "y":31.07 }
•     Right top : { "x": 121.79 , "y":31.21}

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