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ostgals/dist.js

Created March 20, 2019 10:22
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Spherical distance on Earth
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dist.js
// credits: http://janmatuschek.de/LatitudeLongitudeBoundingCoordinates
function dist(a, b) {
const [a0, a1, b0, b1] = [...a, ...b].map(x => x / 180 * Math.PI);
const { acos, sin, cos } = Math;
return acos(sin(a0) * sin(b0) + cos(a0) * cos(b0) * cos(a1 - b1)) * 6371;
}
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