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Latitude Longitude Distance - 140byt.es

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LICENSE.txt
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DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
 
Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>
 
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
 
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
 
0. You just DO WHAT THE FUCK YOU WANT TO.
README.md
Markdown

Latitude Longitude Distance - 140byt.es

This uses the Haversine formula to calculate the great-circle distance between two points.

Usage

distanceLatLng (
  latitude1, longitude1, // first coordinates
  latitude2, longitude2, // seconds coordinates
  diameter // earth diameter (might be any unit)
)

// returns the distance in the specified unit

Earth Diameter

  • 2 * 6378.137 Kilometers
  • 2 * 6378137 Meters
  • 2 * 3963.190 Miles

Author

Created by Martin Kleppe (@aemkei) at Ubilabs.

DIY

Check his "JavaScript Golf Lessons" slides.

For more information

See the 140byt.es site for a showcase of entries (built itself using 140-byte entries!), and follow @140bytes on Twitter.

annotated.js
JavaScript
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function(
a, b, // first coord
c, d, // second coord
e, // earth diameter (might be any unit)
z // placeholder
){
with (Math) // use "Math" in context
return z = PI/360, // used to convert in radiants
e * atan2(
sqrt(
z = pow(sin((c-a)*z), 2) +
cos(a*z*2) * cos(c*z*2) *
pow(sin((d-b)*z), 2)
),
sqrt(1-z)
)
}
package.json
JSON
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{
"name": "distanceLatLng",
 
"description": "Calculate distance between Latitude/Longitude points.",
 
"keywords": [
"geo",
"maps",
"distance"
]
}
test.html
HTML
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<!DOCTYPE html>
<title>Distance between Latitude/Longitude points </title>
<h4>Distance Hamburg-Tokyo</h4>
<div><b>8986</b> km expected</div>
<div><b id="km"></b> km calculated</div>
<div><b>5584</b> miles expected</div>
<div><b id="miles"></b> miles calculated</div>
 
<script>
var distance = function(a,b,c,d,e,z){with(Math)return z=PI/360,e*atan2(sqrt(z=pow(sin((c-a)*z),2)+cos(a*z*2)*cos(c*z*2)*pow(sin((d-b)*z),2)),sqrt(1-z))},
DIAMETER_IN_KM = 2 * 6378.137,
DIAMETER_IN_MILES = 2 * 3963.190,
hamburg = { lat: 53.562, lng: 9.994 },
tokyo = { lat: 35.691, lng: 139.691 };
document.getElementById( "km" ).innerHTML = Math.round(
distance(
hamburg.lat, hamburg.lng,
tokyo.lat, tokyo.lng,
DIAMETER_IN_KM
)
);
document.getElementById( "miles" ).innerHTML = Math.round(
distance(
hamburg.lat, hamburg.lng,
tokyo.lat, tokyo.lng,
DIAMETER_IN_MILES
)
);
</script>

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