@memori.ai/memori-react/esm/helpers/venue.js

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export const EARTH_RADIUS_AT_45_DEGRESS = (6357.0 + 6378.0) / 2.0;
export const DEGREES_TO_RADIANS = Math.PI / 180;
export const getUncertaintyByViewport = (bouningBox) => {
    const [minLat, maxLat, minLng, maxLng] = typeof bouningBox[0] === 'string'
        ? bouningBox.map(parseFloat)
        : bouningBox;
    const phi1 = minLat * DEGREES_TO_RADIANS;
    const lambda1 = minLng * DEGREES_TO_RADIANS;
    const phi2 = maxLat * DEGREES_TO_RADIANS;
    const lambda2 = maxLng * DEGREES_TO_RADIANS;
    const angle = 2.0 *
        Math.asin(Math.sqrt(Math.sin((phi2 - phi1) / 2.0) * Math.sin((phi2 - phi1) / 2.0) +
            Math.cos(phi1) *
                Math.cos(phi2) *
                Math.sin((lambda2 - lambda1) / 2.0) *
                Math.sin((lambda2 - lambda1) / 2.0)));
    return EARTH_RADIUS_AT_45_DEGRESS * angle;
};
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