wrapper for http://jsperf.com/vincenty-vs-haversine-distance-calculations,
all credit for code to author of that link

Geo Distance formulas

![Build Status](https://travis-ci.org/jaxgeller/node-geo-distance)
+ Vincenty
+ Haversine

$3

$ npm install node-geo-distance --save

$3

js
var geo = require('node-geo-distance');

--> {latitude:x, longitude:x}, {latitude:x, longitude:x}, callback(dist)
geo.vincenty(coord1, coord2, callback)
--> {latitude:x, longitude:x}, {latitude:x, longitude:x}
geo.vincentySync(coord1, coord2)
--> {latitude:x, longitude:x}, {latitude:x, longitude:x}, callback(dist)
geo.haversine(coord1, coord2, callback)

--> {latitude:x, longitude:x}, {latitude:x, longitude:x} geo.haversineSync(coord1, coord2)`

`$3`

js
var geo = require('node-geo-distance');
// White house
var coord1 = {
  latitude: 38.8977330,
  longitude: -77.0365310
}
// Washington Monument
var coord2 = {
  latitude: 38.8894840,
  longitude: -77.0352790
}
geo.vincenty(coord1, coord2, function(dist) {
  console.log(dist);
});
var vincentyDist = geo.vincentySync(coord1, coord2);
geo.haversine(coord1, coord2, function(dist) {
  console.log(dist);
});

var haversineDist = geo.haversineSync(coord1, coord2);``