35 lines
1.0 KiB
JavaScript
35 lines
1.0 KiB
JavaScript
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/**
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* 计算两点间距离（单位：米）
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* @param {number} lon1 - 第一个点的经度
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* @param {number} lat1 - 第一个点的纬度
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* @param {number} lon2 - 第二个点的经度
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* @param {number} lat2 - 第二个点的纬度
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* @returns {number} 两点间距离（米）
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*/
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function calculateDistance(lon1, lat1, lon2, lat2) {
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// 将角度转换为弧度
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const radLat1 = (lat1 * Math.PI) / 180.0;
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const radLat2 = (lat2 * Math.PI) / 180.0;
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const deltaRadLat = radLat1 - radLat2;
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const deltaRadLon = ((lon1 - lon2) * Math.PI) / 180.0;
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// Haversine公式计算距离
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const a =
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Math.sin(deltaRadLat / 2) * Math.sin(deltaRadLat / 2) +
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Math.cos(radLat1) *
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Math.cos(radLat2) *
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Math.sin(deltaRadLon / 2) *
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Math.sin(deltaRadLon / 2);
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const b = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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// 地球半径（米）
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const earthRadius = 6371000;
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const distance = earthRadius * b;
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return Math.round(distance);
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}
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module.exports = {
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calculateDistance: calculateDistance,
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};
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