algorithm - 计算两个经度点之间的距离？ （Haversine公式）(Calculate distance between two latitude-longitude points? (Haversine formula))

Question

How do I calculate the distance between two points specified by latitude and longitude?

(如何计算经度和纬度指定的两点之间的距离？)

For clarification, I'd like the distance in kilometers;

(为了澄清起见，我想要以千米为单位的距离；)

the points use the WGS84 system and I'd like to understand the relative accuracies of the approaches available.

(这些要点使用WGS84系统，我想了解可用方法的相对准确性。)

  ask by Robin Minto translate from so

Answer 1

This link might be helpful to you, as it details the use of the Haversine formula to calculate the distance.

(该链接可能会对您有所帮助，因为它详细说明了使用Haversine公式计算距离的方法。)

Excerpt:

(摘抄：)

This script [in Javascript] calculates great-circle distances between the two points – that is, the shortest distance over the earth's surface – using the 'Haversine' formula.

(该脚本（使用Java语言）使用“ Haversine”公式计算两点之间的大圆距离-即地球表面上的最短距离。)

function getDistanceFromLatLonInKm(lat1,lon1,lat2,lon2) {
  var R = 6371; // Radius of the earth in km
  var dLat = deg2rad(lat2-lat1);  // deg2rad below
  var dLon = deg2rad(lon2-lon1); 
  var a = 
    Math.sin(dLat/2) * Math.sin(dLat/2) +
    Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2)) * 
    Math.sin(dLon/2) * Math.sin(dLon/2)
    ; 
  var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
  var d = R * c; // Distance in km
  return d;
}

function deg2rad(deg) {
  return deg * (Math.PI/180)
}