calculate distance between two latitude-longitude points. using Haversine formula http://en.wikipedia.org/wiki/Haversine_formula
| getDistanceFromLatLonInKm = (lat1, lon1, lat2, lon2)-> | |
| R = 6371 # Radius of the earth in km | |
| dLat = deg2rad(lat2 - lat1) # deg2rad below | |
| dLon = deg2rad(lon2 - lon1) | |
| 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) | |
| c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)) | |
| d = R * c # Distance in km | |
| return d | |
| deg2rad = (deg)-> | |
| deg * (Math.PI / 180) |
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