public LL ToLL()
{
var wgs84 = new RefEll(6378137, 6356752.314);
double UTM_F0 = 0.9996;
double a = wgs84.maj;
double eSquared = wgs84.ecc;
double ePrimeSquared = eSquared / (1.0 - eSquared);
double e1 = (1 - Math.Sqrt(1 - eSquared)) / (1 + Math.Sqrt(1 - eSquared));
double x = this.Easting - 500000.0; ;
double y = this.Northing;
double zoneNumber = this.LongitudeZone;
char zoneLetter = this.LatitudeZone;
double longitudeOrigin = (zoneNumber - 1.0) * 6.0 - 180.0 + 3.0;
//TO Check
// Correct y for southern hemisphere
if (zoneLetter < 'N')
y -= 10000000.0;
double m = y / UTM_F0;
double mu =
m
/ (a
* (1.0
- eSquared / 4.0
- 3.0 * eSquared * eSquared / 64.0
- 5.0
* Math.Pow(eSquared, 3.0)
/ 256.0));
double phi1Rad = mu
+ (3.0 * e1 / 2.0 - 27.0 * Math.Pow(e1, 3.0) / 32.0) * Math.Sin(2.0 * mu)
+ (21.0 * e1 * e1 / 16.0 - 55.0 * Math.Pow(e1, 4.0) / 32.0)
* Math.Sin(4.0 * mu)
+ (151.0 * Math.Pow(e1, 3.0) / 96.0) * Math.Sin(6.0 * mu);
double n = a / Math.Sqrt(1.0 - eSquared * Math.Sin(phi1Rad) * Math.Sin(phi1Rad));
double t = Math.Tan(phi1Rad) * Math.Tan(phi1Rad);
double c = ePrimeSquared * Math.Cos(phi1Rad) * Math.Cos(phi1Rad);
double r = a * (1.0 - eSquared) / Math.Pow(1.0 - eSquared * Math.Sin(phi1Rad) * Math.Sin(phi1Rad), 1.5);
double d = x / (n * UTM_F0);
double latitude = (
phi1Rad - (n * Math.Tan(phi1Rad) / r) * (d * d / 2.0
- (5.0 + (3.0 * t) + (10.0 * c) - (4.0 * c * c) - (9.0 * ePrimeSquared)) * Math.Pow(d, 4.0) / 24.0
+ (61.0 + (90.0 * t) + (298.0 * c) + (45.0 * t * t) - (252.0 * ePrimeSquared) - (3.0 * c * c)) * Math.Pow(d, 6.0)
/ 720.0)) * (180.0 / Math.PI);
double longitude = longitudeOrigin + ((d
- (1.0 + 2.0 * t + c) * Math.Pow(d, 3.0) / 6.0
+ (5.0 - (2.0 * c) + (28.0 * t) - (3.0 * c * c) + (8.0 * ePrimeSquared) + (24.0 * t * t)) * Math.Pow(d, 5.0) / 120.0)
/ Math.Cos(phi1Rad)) * (180.0 / Math.PI);
return new LL(latitude, longitude);
}
public LL ToLatLng()
{
var airy1830 = new RefEll(6377563.396, 6356256.909);
double OSGB_F0 = 0.9996012717;
double N0 = -100000.0;
double E0 = 400000.0;
double phi0 = Deg2rad(49.0);
double lambda0 = Deg2rad(-2.0);
double a = airy1830.maj;
double b = airy1830.min;
double eSquared = airy1830.ecc;
double phi = 0.0;
double lambda = 0.0;
double E = this.Easting;
double N = this.Northing;
double n = (a - b) / (a + b);
double M = 0.0;
double phiPrime = ((N - N0) / (a * OSGB_F0)) + phi0;
do {
M =
(b * OSGB_F0)
* (((1 + n + ((5.0 / 4.0) * n * n) + ((5.0 / 4.0) * n * n * n))
* (phiPrime - phi0))
- (((3 * n) + (3 * n * n) + ((21.0 / 8.0) * n * n * n))
* Math.Sin(phiPrime - phi0)
* Math.Cos(phiPrime + phi0))
+ ((((15.0 / 8.0) * n * n) + ((15.0 / 8.0) * n * n * n))
* Math.Sin(2.0 * (phiPrime - phi0))
* Math.Cos(2.0 * (phiPrime + phi0)))
- (((35.0 / 24.0) * n * n * n)
* Math.Sin(3.0 * (phiPrime - phi0))
* Math.Cos(3.0 * (phiPrime + phi0))));
phiPrime += (N - N0 - M) / (a * OSGB_F0);
} while ((N - N0 - M) >= 0.001);
double v = a * OSGB_F0 * Math.Pow(1.0 - eSquared * SinSquared(phiPrime), -0.5);
double rho =
a
* OSGB_F0
* (1.0 - eSquared)
* Math.Pow(1.0 - eSquared * SinSquared(phiPrime), -1.5);
double etaSquared = (v / rho) - 1.0;
double VII = Math.Tan(phiPrime) / (2.0 * rho * v);
double VIII =
(Math.Tan(phiPrime) / (24.0 * rho * Math.Pow(v, 3.0)))
* (5.0
+ (3.0 * TanSquared(phiPrime))
+ etaSquared
- (9.0 * TanSquared(phiPrime) * etaSquared));
double IX =
(Math.Tan(phiPrime) / (720.0 * rho * Math.Pow(v, 5.0)))
* (61.0
+ (90.0 * TanSquared(phiPrime))
+ (45.0 * TanSquared(phiPrime) * TanSquared(phiPrime)));
double X = Sec(phiPrime) / v;
double XI =
(Sec(phiPrime) / (6.0 * v * v * v))
* ((v / rho) + (2 * TanSquared(phiPrime)));
double XII =
(Sec(phiPrime) / (120.0 * Math.Pow(v, 5.0)))
* (5.0
+ (28.0 * TanSquared(phiPrime))
+ (24.0 * TanSquared(phiPrime) * TanSquared(phiPrime)));
double XIIA =
(Sec(phiPrime) / (5040.0 * Math.Pow(v, 7.0)))
* (61.0
+ (662.0 * TanSquared(phiPrime))
+ (1320.0 * TanSquared(phiPrime) * TanSquared(phiPrime))
+ (720.0
* TanSquared(phiPrime)
* TanSquared(phiPrime)
* TanSquared(phiPrime)));
phi =
phiPrime
- (VII * Math.Pow(E - E0, 2.0))
+ (VIII * Math.Pow(E - E0, 4.0))
- (IX * Math.Pow(E - E0, 6.0));
lambda =
lambda0
+ (X * (E - E0))
- (XI * Math.Pow(E - E0, 3.0))
+ (XII * Math.Pow(E - E0, 5.0))
- (XIIA * Math.Pow(E - E0, 7.0));
return new LL(Rad2deg(phi), Rad2deg(lambda));
}
public UTM ToUTM()
{
var wgs84 = new RefEll(6378137, 6356752.314);
double UTM_F0 = 0.9996;
double a = wgs84.maj;
double eSquared = wgs84.ecc;
double longitude = this.Longitude;
double latitude = this.Latitude;
double latitudeRad = latitude * (Math.PI / 180.0);
double longitudeRad = longitude * (Math.PI / 180.0);
int longitudeZone = (int)Math.Floor((longitude + 180.0) / 6.0) + 1;
// Special zone for Norway
if (latitude >= 56.0 && latitude < 64.0 && longitude >= 3.0 && longitude < 12.0)
longitudeZone = 32;
// Special zones for Svalbard
if (latitude >= 72.0 && latitude < 84.0) {
if (longitude >= 0.0 && longitude < 9.0) longitudeZone = 31;
else if (longitude >= 9.0 && longitude < 21.0) longitudeZone = 33;
else if (longitude >= 21.0 && longitude < 33.0) longitudeZone = 35;
else if (longitude >= 33.0 && longitude < 42.0) longitudeZone = 37;
}
double longitudeOrigin = (longitudeZone - 1.0) * 6.0 - 180.0 + 3.0;
double longitudeOriginRad = longitudeOrigin * (Math.PI / 180.0);
char UTMZone = GetUTMLatitudeZoneLetter(latitude);
double ePrimeSquared = (eSquared) / (1.0 - eSquared);
double n = a / Math.Sqrt(1 - eSquared * Math.Sin(latitudeRad) * Math.Sin(latitudeRad));
double t = Math.Tan(latitudeRad) * Math.Tan(latitudeRad);
double c = ePrimeSquared * Math.Cos(latitudeRad) * Math.Cos(latitudeRad);
double A = Math.Cos(latitudeRad) * (longitudeRad - longitudeOriginRad);
double eSquared2 = eSquared * eSquared;
double eSquared3 = eSquared * eSquared * eSquared;
double M = a * (
(1.0 - eSquared / 4.0 - 3.0 * eSquared2 / 64.0 - 5.0 * eSquared3 / 256.0) * latitudeRad
- (3.0 * eSquared / 8.0 + 3.0 * eSquared2 / 32.0 + 45.0 * eSquared3 / 1024.0) * Math.Sin(2.0 * latitudeRad)
+ (15.0 * eSquared * eSquared / 256.0 + 45.0 * eSquared3 / 1024.0) * Math.Sin(4.0 * latitudeRad)
- (35.0 * eSquared3 / 3072.0) * Math.Sin(6.0 * latitudeRad));
double UTMEasting = UTM_F0 * n * (
A + (1.0 - t + c) * Math.Pow(A, 3.0) / 6.0
+ (5.0 - 18.0 * t + t * t + 72.0 * c - 58.0 * ePrimeSquared) * Math.Pow(A, 5.0) / 120)
+ 500000.0;
double UTMNorthing = UTM_F0 * (M + n * Math.Tan(latitudeRad) * (A * A / 2.0
+ (5.0 - t + (9.0 * c) + (4.0 * c * c)) * Math.Pow(A, 4.0) / 24.0
+ (61.0 - (58.0 * t) + (t * t) + (600.0 * c) - (330.0 * ePrimeSquared)) * Math.Pow(A, 6.0) / 720.0));
// Adjust for the southern hemisphere
if (latitude < 0)
UTMNorthing += 10000000.0;
return new UTM(UTMEasting, UTMNorthing, UTMZone, longitudeZone);
}
public void WGS84ToOSGB36()
{
var wgs84 = new RefEll(6378137.000, 6356752.3141);
double a = wgs84.maj;
double b = wgs84.min;
double eSquared = wgs84.ecc;
double phi = Deg2rad(this.Latitude);
double lambda = Deg2rad(this.Longitude);
double v = a / (Math.Sqrt(1 - eSquared * SinSquared(phi)));
double H = 0; // height
double x = (v + H) * Math.Cos(phi) * Math.Cos(lambda);
double y = (v + H) * Math.Cos(phi) * Math.Sin(lambda);
double z = ((1 - eSquared) * v + H) * Math.Sin(phi);
double tx = -446.448;
double ty = 124.157;
double tz = -542.060;
double s = 0.0000204894;
double rx = Deg2rad(-0.00004172222);
double ry = Deg2rad(-0.00006861111);
double rz = Deg2rad(-0.00023391666);
double xB = tx + (x * (1 + s)) + (-rx * y) + (ry * z);
double yB = ty + (rz * x) + (y * (1 + s)) + (-rx * z);
double zB = tz + (-ry * x) + (rx * y) + (z * (1 + s));
var airy1830 = new RefEll(6377563.396, 6356256.909);
a = airy1830.maj;
b = airy1830.min;
eSquared = airy1830.ecc;
double lambdaB = Rad2deg(Math.Atan(yB / xB));
double p = Math.Sqrt((xB * xB) + (yB * yB));
double phiN = Math.Atan(zB / (p * (1.0 - eSquared)));
for (var i = 1; i < 10; i++) {
v = a / (Math.Sqrt(1 - eSquared * SinSquared(phiN)));
double phiN1 = Math.Atan((zB + (eSquared * v * Math.Sin(phiN))) / p);
phiN = phiN1;
}
double phiB = Rad2deg(phiN);
this.Latitude = phiB;
this.Longitude = lambdaB;
}
public OSRef ToOSRef()
{
var airy1830 = new RefEll(6377563.396, 6356256.909);
double OSGB_F0 = 0.9996012717;
double N0 = -100000.0;
double E0 = 400000.0;
double phi0 = Deg2rad(49.0);
double lambda0 = Deg2rad(-2.0);
double a = airy1830.maj;
double b = airy1830.min;
double eSquared = airy1830.ecc;
double phi = Deg2rad(this.Latitude);
double lambda = Deg2rad(this.Longitude);
double n = (a - b) / (a + b);
double v = a * OSGB_F0 * Math.Pow(1.0 - eSquared * SinSquared(phi), -0.5);
double rho = a * OSGB_F0 * (1.0 - eSquared) * Math.Pow(1.0 - eSquared * SinSquared(phi), -1.5);
double etaSquared = (v / rho) - 1.0;
double M = (b * OSGB_F0)
* (((1 + n + ((5.0 / 4.0) * n * n) + ((5.0 / 4.0) * n * n * n))
* (phi - phi0))
- (((3 * n) + (3 * n * n) + ((21.0 / 8.0) * n * n * n)) * Math.Sin(phi - phi0) * Math.Cos(phi + phi0))
+ ((((15.0 / 8.0) * n * n) + ((15.0 / 8.0) * n * n * n)) * Math.Sin(2.0 * (phi - phi0)) * Math.Cos(2.0 * (phi + phi0)))
- (((35.0 / 24.0) * n * n * n) * Math.Sin(3.0 * (phi - phi0)) * Math.Cos(3.0 * (phi + phi0))));
double I = M + N0;
double II = (v / 2.0) * Math.Sin(phi) * Math.Cos(phi);
double III = (v / 24.0)
* Math.Sin(phi)
* Math.Pow(Math.Cos(phi), 3.0)
* (5.0 - TanSquared(phi) + (9.0 * etaSquared));
double IIIA = (v / 720.0)
* Math.Sin(phi)
* Math.Pow(Math.Cos(phi), 5.0)
* (61.0 - (58.0 * TanSquared(phi)) + Math.Pow(Math.Tan(phi), 4.0));
double IV = v * Math.Cos(phi);
double V = (v / 6.0) * Math.Pow(Math.Cos(phi), 3.0) * ((v / rho) - TanSquared(phi));
double VI = (v / 120.0)
* Math.Pow(Math.Cos(phi), 5.0)
* (5.0 - (18.0 * TanSquared(phi)) + (Math.Pow(Math.Tan(phi), 4.0)) + (14 * etaSquared) - (58 * TanSquared(phi) * etaSquared));
double N = I + (II * Math.Pow(lambda - lambda0, 2.0)) + (III * Math.Pow(lambda - lambda0, 4.0)) + (IIIA * Math.Pow(lambda - lambda0, 6.0));
double E = E0 + (IV * (lambda - lambda0)) + (V * Math.Pow(lambda - lambda0, 3.0)) + (VI * Math.Pow(lambda - lambda0, 5.0));
return new OSRef(E, N);
}