基于js和openlayer计算2个经纬度点之间的距离


基于js和openlayer计算2个经纬度点之间的距离

//计算2个经纬度点之间的距离
//Haversine formula 算法
var harvensin=function()
{
    this.earch_radius=6371008.8;   // 地球半径 平均值  米
    this.distance=function(lat1,lon1,lat2,lon2)
    {
        //用haversine公式计算球面两点间的距离。
        //经纬度转换成弧度
        var h_lat1=lat1*Math.PI/180.0;
        var h_lon1=lon1*Math.PI/180.0;
        var h_lat2=lat2*Math.PI/180.0;
        var h_lon2=lon2*Math.PI/180.0;
        //差值
        var vlon=Math.abs(h_lon1-h_lon2);
        var vlat=Math.abs(h_lat1-h_lat2);
        //
        var h=this.HaverSin(vlat)+Math.cos(h_lat1)*Math.cos(h_lat2)*this.HaverSin(vlon);
        //
        var d=2*this.earch_radius*Math.asin(Math.sqrt(h));
        //
        return d;
    };
    this.HaverSin=function(theta)
    {
         var v=Math.sin(theta/2);
         return v*v;
    };
};
//自定义函数 利用haversine算法公式
function latlongDistance(lat1,lon1,lat2,lon2)
{
    var hs=new harvensin();
    return hs.distance(lat1,lon1,lat2,lon2);
};
//latlongDistance(105.3,34.1,105.4,34.2)=11502.501545669946  (米)
//openlayer5.2 lib函数  长度计算调用方法
function sphereDistance(lat1,lon1,lat2,lon2)
{
    var c1=[2];c1[0]=lon1;c1[1]=lat1;
    var c2=[2];c2[0]=lon2;c2[1]=lat2;
    return ol.sphere.getDistance(c1,c2);
};
//sphereDistance(105.3,34.1,105.4,34.2)=11502.501545669955   (米)
function getLength_custom()
{
    var geo=drawLayer.getFirstGeometry();
    var coordinates=geo.getCoordinates();
    var len=0;
    for(var i=0;i<coordinates.length-1;i++)
    {
        len+=latlongDistance(coordinates[i][1],coordinates[i][0],coordinates[i+1][1],coordinates[i+1][0]);
    }
    return len;
};
function getLength()
{
    var geo=drawLayer.getFirstGeometry();
    var options={};
    options.projection=drawLayer.crs;   //EPSG:4326
    return ol.sphere.getLength(geo,options);   //米
};
function getArea()
{
    var geo=drawLayer.getFirstGeometry();
    var options={};
    options.projection=drawLayer.crs;   //EPSG:4326
    return ol.sphere.getArea(geo,options);   //平方米
};

参考地址:
http://openlayers.org/en/latest/apidoc/
http://www.cnblogs.com/softfair/p/distance_of_two_latitude_and_longitude_points.html

转载自:https://blog.csdn.net/hsg77/article/details/85625048

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