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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.
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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) | |
} |
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Copyright 2018 Hendrik Eduard Kuiper | |
Permission is hereby granted, free of charge, to any person obtaining a | |
copy of this software and associated documentation files (the "Software"), | |
to deal in the Software without restriction, including without limitation the | |
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
sell copies of the Software, and to permit persons to whom the Software is | |
furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in | |
all copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES | |
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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