X坐标：X坐标是某一个点距离原点的水平距离。
X coordinates: The X coordinate is a point's horizontal distance from the origin.
Y坐标：Y坐标是某一个点距离原点的纵向距离。
Y coordinates: The Y coordinate is a point's vertical distance from the origin.
然后是能够帮助根据GPS坐标计算距离的库。
Next was a library that made it easy to do distance calculations from GPS coordinates.
要按照距离进行查询，必须使用投影坐标系。
To query by distance, you must use a projected coordinate system.
坐标系统设置与距离限制。
坐标系统设置与距离限制。
应用推荐