GIS坐标系转换(EPSG:4326与EPSG:3857相互转换)

在线js运行: https://www.bejson.com/runcode/javascript/

// EPSG:3857转换经纬度(EPSG:4326)
console.log("Hello, World");
var center = [13688941.247121427,3221879.4759551883];
function mercatorTolonlat(center){
    var lonlat={
    	x:0,
    	y:0
    };
    var x = center[0]/20037508.34*180;
    var y = center[1]/20037508.34*180;
    y= 180/Math.PI*(2*Math.atan(Math.exp(y*Math.PI/180))-Math.PI/2);
    lonlat.x = x;
    lonlat.y = y;
    return lonlat;
}
console.log(mercatorTolonlat(center));
// 经纬度(EPSG:4326)转换EPSG:3857
// javascript 转换
var lonlat = mercatorTolonlat(center);
function lonLat2Mercator(lonlat){
    var mercator = {
		x:0,
    	y:0
	};
    var earthRad = 6378137.0;
    mercator.x = lonlat.lng * Math.PI / 180 * earthRad;
    var a = lonlat.lat * Math.PI / 180;
    mercator.y = earthRad / 2 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));
    return mercator;
}
console.log(lonLat2Mercator(lonlat));

参考地址：https://blog.csdn.net/semian7633/article/details/109258717

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