UTFGrid

UTFGrid parameters:
Center:     {"x": 121.49 ,"y": 31.32 }
Scale:     0.000003461453
View bounds:

•     Left bottom: {"x": 121.4 , "y":31.23 }
•     Right top : { "x": 121.58 , "y":31.4}

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