经纬度转WGS84坐标
Cartesian3.fromRadians = function (
longitude,
latitude,
height,
ellipsoid, # default is WGS84
result
) {
//>>includeStart('debug', );
Check.typeOf.number("longitude", longitude);
Check.typeOf.number("latitude", latitude);
//>>includeEnd('debug');
height = defaultValue(height, 0.0);
var radiiSquared = defined(ellipsoid)
? ellipsoid.radiiSquared
: wgs84RadiiSquared;
var cosLatitude = Math.cos(latitude);
scratchN.x = cosLatitude * Math.cos(longitude);
scratchN.y = cosLatitude * Math.sin(longitude);
scratchN.z = Math.sin(latitude);
scratchN = Cartesian3.normalize(scratchN, scratchN);
Cartesian3.multiplyComponents(radiiSquared, scratchN, scratchK);
var gamma = Math.sqrt(Cartesian3.dot(scratchN, scratchK));
scratchK = Cartesian3.divideByScalar(scratchK, gamma, scratchK);
scratchN = Cartesian3.multiplyByScalar(scratchN, height, scratchN);
if (!defined(result)) {
result = new Cartesian3();
}
return Cartesian3.add(scratchK, scratchN, result);
};