计算2个GPS坐标之间的距离 [英] Calculate distance between 2 GPS coordinates

问题描述

我如何计算两个GPS坐标之间的距离（使用经度和纬度）？

How do I calculate distance between two GPS coordinates (using latitude and longitude)?

推荐答案

根据纬度和经度计算两个坐标之间的距离，包括一个Javascript实现。

Calculate the distance between two coordinates by latitude and longitude, including a Javascript implementation.

West 和 South 位置为负值。
请记住，分钟和秒数都在60以内，所以S31 30'是-31.50度。

West and South locations are negative. Remember minutes and seconds are out of 60 so S31 30' is -31.50 degrees.

不要忘记将度数转换为弧度。许多语言都有这个功能。或者简单的计算：弧度=度* PI / 180 。

Don't forget to convert degrees to radians. Many languages have this function. Or its a simple calculation: radians = degrees * PI / 180.

function degreesToRadians(degrees) {
  return degrees * Math.PI / 180;
}

function distanceInKmBetweenEarthCoordinates(lat1, lon1, lat2, lon2) {
  var earthRadiusKm = 6371;

  var dLat = degreesToRadians(lat2-lat1);
  var dLon = degreesToRadians(lon2-lon1);

  lat1 = degreesToRadians(lat1);
  lat2 = degreesToRadians(lat2);

  var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
          Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); 
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
  return earthRadiusKm * c;
}

以下是一些使用示例：

Here are some examples of usage:

distanceInKmBetweenCoordinates（0,0,0,0）//相同点之间的距离应为0
0
distanceInKmBetweenCoordinates（51.5，0，38.8， - 77.1）//从伦敦到阿灵顿
5918.185064088764

distanceInKmBetweenCoordinates(0,0,0,0) // Distance between same points should be 0 0 distanceInKmBetweenCoordinates(51.5, 0, 38.8, -77.1) // From London to Arlington 5918.185064088764

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