UTFGrid

UTFGrid parameters:
Center:     {"x": 121.7 ,"y": 31.15 }
Scale:     0.000004791215
View bounds:

•     Left bottom: {"x": 121.64 , "y":31.08 }
•     Right top : { "x": 121.77 , "y":31.21}

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