Question

怎样算经纬度

Answer 1

//根据经纬度坐标算两点间距离,通用算法,忽略80或54坐标系问题,有误差

// 两点间的距离,单位为米

//javascript编写,可以按需要用其他编程语言转换.

function calcDistance(mX,mY,mX2,mY2) {

var mDistance = 0;

var Lon1 = mX2 * Math.PI / 180;

var Lon2 = mX * Math.PI / 180;

var Lat1 = mY2 * Math.PI / 180;

var Lat2 = mY * Math.PI / 180;

var LonDist = Lon1-Lon2;

var LatDist = Lat1-Lat2;

var xD = Math.abs(mX - mX2);

var yD = Math.abs(mY - mY2);

mDistance = Math.sqrt(Math.pow(xD,2) + Math.pow(yD,2));

var theDist = convertUnits(mDistance);

var u = Math.pow(10,numDecimals);

currentMeasure = parseInt(theDist*u+(5/10))/u;

return currentMeasure;

}

// convert the amounts to new units

function convertUnits(theDist1) {

var theDist = parseFloat(theDist1);

var mDistance = theDist;

mDistance = theDist * (6213711922/10000000000000);

var u = Math.pow(10,numDecimals);

mDistance = parseInt(mDistance * u + (5/10)) / u

return mDistance;