/// <summary>
/// Convert Lambert* point into WGS84 in radian
/// </summary>
/// <param name="org">Point to convert</param>
/// <param name="zone">Lambert type</param>
/// <returns>Converted point</returns>
/// <remarks>WGS84 refers to greenwich</remarks>
public static Point ConvertToWGS84(Point org, Enums.LambertZoneType zone)
{
var lzone = new LambertZone(zone);
if (zone == Enums.LambertZoneType.Lambert93)
{
return(LambertToGeographic(org, lzone, LambertZone.LON_MERID_IERS, LambertZone.E_WGS84,
LambertZone.DEFAULT_EPS));
}
var pt1 = LambertToGeographic(org, lzone, LambertZone.LON_MERID_PARIS, LambertZone.E_CLARK_IGN,
LambertZone.DEFAULT_EPS);
var pt2 = GeographicToCartesian(pt1.X, pt1.Y, pt1.Z, LambertZone.A_CLARK_IGN,
LambertZone.E_CLARK_IGN);
pt2.Translate(-168, -60, 320);
//WGS84 refers to greenwich
return(CartesianToGeographic(pt2, LambertZone.LON_MERID_GREENWICH, LambertZone.A_WGS84,
LambertZone.E_WGS84, LambertZone.DEFAULT_EPS));
}
private static Point LambertToGeographic(Point org, LambertZone zone, double lonMeridian, double e, double eps)
{
var n = zone.n();
var c = zone.c();
var xs = zone.xs();
var ys = zone.ys();
var x = org.X;
var y = org.Y;
var r = Math.Sqrt((x - xs) * (x - xs) + (y - ys) * (y - ys));
var gamma = Math.Atan((x - xs) / (ys - y));
var lon = lonMeridian + gamma / n;
var latIso = -1 / n * Math.Log(Math.Abs(r / c));
var lat = LatitudeFromLatitudeIso(latIso, e, eps);
var dest = new Point(lon, lat, 0);
return(dest);
}