To query by distance, you must use a projected coordinate system.

要按照距离进行查询，必须使用投影坐标系。

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X coordinates: The X coordinate is a point's horizontal distance from the origin.

X 坐标：X 坐标是某一个点距离原点的水平距离。

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Y coordinates: The Y coordinate is a point's vertical distance from the origin.

Y 坐标：Y 坐标是某一个点距离原点的纵向距离。

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Better to have that piece of work done locally by all the endpoints and have them send a light information stream to the center: a single map coordinate rather than a bunch of tower coordinates and distance measurements.

FORBES: The Case For Endpoints