如何编辑位置数据的粒度（lon，lat）

Question

假设我有一个位置-44.1321,50.3145代表街道一级。编辑后的版本在城市级别代表什么？

还有，什么定义了数据的粒度？感谢。

Answer 1

The number of decimal places required for a particular precision for latitude & longitude at the equator is:

decimal places  at equator  
1.0             111.32 km   
0.1              11.132 km  
0.01              1.1132 km     
0.001           111.32 m    
0.0001           11.132 m   
0.00001           1.1132 m  
0.000001        111.32 mm   
0.0000001        11.132 mm  
0.00000001        1.1132 mm 

As you moves away from the equator towards a pole the longitude distance decreases as it approaches the pole.

The longitude distance can be calculated by multiplying the latitude distance by the cosine of the longitude.

ie at 45degree  1.1132 m * cos(45)
                = 0.00001* 0.707
                = 0.7871 m