haversine distance-formula-2

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var haversine = (function() {

  // convert to radians
  var toRad = function(num) {
    return num * Math.PI / 180
  }

  return function haversine(start, end, options) {
    var miles = 3960
    var km    = 6371
    options   = options || {}

    var R = options.unit === 'km' ? km : miles

    var dLat = toRad(end.latitude - start.latitude)
    var dLon = toRad(end.longitude - start.longitude)
    var lat1 = toRad(start.latitude)
    var lat2 = toRad(end.latitude)

    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))

    if (options.threshold) {
      return options.threshold > (R * c)
    } else {
      return R * c
    }     
  }

})()
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2
var haversine = (function() {

  // convert to radians
  var toRad = function(num) {
    return num * Math.PI / 180
  }

  return function haversine(start, end, options) {
    var miles = 3960
    var km    = 6371
    options   = options || {}

    var R = options.unit === 'km' ? km : miles

    var dLat = toRad(end.latitude - start.latitude)
    var dLon = toRad(end.longitude - start.longitude)
    var lat1 = toRad(start.latitude)
    var lat2 = toRad(end.latitude)

    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))

    if (options.threshold) {
      return options.threshold > (R * c)
    } else {
      return R * c
    }     
  }

})()
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Revisions

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  • Revision 1: published by brett on