高德面积计算公式 js版

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分类专栏：高德地图

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高德面积计算公式 js版

计算一个经纬度围成的实际面积，下面是js方法

        var ring = [
        [116.169465,39.932670],
        [116.160260,39.924492], 
        [116.186138,39.879817], 
        [116.150625,39.710019],
        [116.183198,39.709920], 
        [116.226950,39.777616], 
        [116.421078,39.810771],
        [116.442621,39.799892],
        [116.463478,39.790066], 
        [116.588276,39.809551],
        [116.536091,39.808859],
        [116.573856,39.839643], 
        [116.706380,39.916740],
        [116.657285,39.934545],
        [116.600293,39.937770],
        [116.540039,39.937968],
        [116.514805,39.982375],
        [116.499935,40.013710],
        [116.546520,40.030443], 
        [116.687668,40.129961], 
        [116.539697,40.080659],
        [116.503390,40.058474],
        [116.468800,40.052578]
    ];

   var area =  getArea(ring);

   console.info("面积",area);
         

/**
 *面积算法 zdb
 */
function getArea(ring) {
    var sJ = 6378137;
    var Hq = 0.017453292519943295;

    var arr = [];
    for (var i = 0;i< ring.length; i++){
        var poi = {
            lng:ring[i][0],
            lat:ring[i][1]
        };
        arr[i] = poi;
    }

    ring = arr;

    var c = sJ *Hq , d = 0 , e = ring.length;

    if (3 > e) {
        return 0;
    }
   
    for (var g = 0; g < e - 1; g += 1){
        var h = ring[g], k = ring[g + 1];
        var u = h.lng * c * Math.cos(h.lat * Hq);
        var h = h.lat * c;
        var v = k.lng * c * Math.cos(k.lat *Hq);
        var d = d + (u * k.lat * c - v * h);
    }

    g = ring[g];
    ring = ring[0];
    e = g.lng * c * Math.cos(g.lat * Hq);
    g = g.lat * c;
    k = ring.lng * c * Math.cos(ring.lat * Hq);
    d += e * ring.lat * c - k * g;
    return 0.5*Math.abs(d)
}