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https://github.com/bilawalsidhu/gods-eye-view.git
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Sameh Khamis
c6f0f9db0a
The flights records and the mesh-floor sampler kept identical copies of the equirectangular distance; both now import src/data/approxDistance.js. The changelog entry moves to changelog.d (#787), and CURRENT-STATE notes the antimeridian behaviour.
13 lines
445 B
JavaScript
13 lines
445 B
JavaScript
/**
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* Local equirectangular distance in km, for viewer-proximity gates. Takes the
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* short way round, so points either side of 180° stay close.
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*/
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export function approxDistanceKm(lat1, lon1, lat2, lon2) {
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const dLat = (lat2 - lat1) * 111.32;
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let dLonDeg = lon2 - lon1;
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dLonDeg -= 360 * Math.round(dLonDeg / 360);
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const dLon =
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dLonDeg * 111.32 * Math.cos((((lat1 + lat2) / 2) * Math.PI) / 180);
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return Math.hypot(dLat, dLon);
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}
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