经纬度坐标下的球面多边形面积计算公式
04-02 19:09:06 浏览次数:381次 栏目:数学课堂
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经纬度坐标下的球面多边形面积计算公式,http://www.dbk123.com
// calculate Area
function calcArea(PointX,PointY,MapUnits) {
var Count = PointX.length
if (Count>3) {
var mtotalArea = 0;
if((PointX[0]!=PointX[Count-1])||(PointY[0]!=PointY[Count-1]))
{
return;
}
if (MapUnits=="DEGREES")//经纬度坐标下的球面多边形
{
var LowX=0.0;
var LowY=0.0;
var MiddleX=0.0;
var MiddleY=0.0;
var HighX=0.0;
var HighY=0.0;
var AM = 0.0;
var BM = 0.0;
var CM = 0.0;
var AL = 0.0;
var BL = 0.0;
var CL = 0.0;
var AH = 0.0;
var B
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H = 0.0;
var CH = 0.0;
var CoefficientL = 0.0;
var CoefficientH = 0.0;