/// <summary>
/// Initializes the transform using the parameters from the specified coordinate system information
/// </summary>
/// <param name="projInfo">A ProjectionInfo class contains all the standard and custom parameters needed to initialize this transform</param>
protected override void OnInit(ProjectionInfo projInfo)
{
Phi0 = projInfo.GetPhi0();
if (Math.Abs(Math.Abs(Phi0) - HalfPi) < EPS10)
{
_mode = Phi0 < 0 ? Modes.SouthPole : Modes.NorthPole;
_sinph0 = Phi0 < 0 ? -1: 1;
_cosph0 = 0;
}
else if (Math.Abs(Phi0) < EPS10)
{
_mode = Modes.Equitorial;
_sinph0 = 0;
_cosph0 = 1;
}
else
{
_mode = Modes.Oblique;
_sinph0 = Math.Sin(Phi0);
_cosph0 = Math.Cos(Phi0);
}
if (Es == 0)return;
_en = Proj.Enfn(Es);
if(projInfo.Parameters.ContainsKey("guam"))
{
_M1 = Proj.Mlfn(Phi0, _sinph0, _cosph0, _en);
_isGuam = true;
}
else
{
switch (_mode)
{
case Modes.NorthPole:
_Mp = Proj.Mlfn(HalfPi, 1, 0, _en);
break;
case Modes.SouthPole:
_Mp = Proj.Mlfn(-HalfPi, -1, 0, _en);
break;
case Modes.Equitorial:
case Modes.Oblique:
_N1 = 1/ Math.Sqrt(1- Es * _sinph0 * _sinph0);
_g = _sinph0 * (_He = E / Math.Sqrt(OneEs));
_He *= _cosph0;
break;
}
}
}
/// <summary>
/// Initializes the transform using the parameters from the specified coordinate system information
/// </summary>
/// <param name="projInfo">A ProjectionInfo class contains all the standard and custom parameters needed to initialize this transform</param>
protected override void OnInit(ProjectionInfo projInfo)
{
/* read some Parameters,
* here Latitude Truescale */
double ts = 0;
if(projInfo.StandardParallel1 != null) ts = projInfo.StandardParallel1.Value*Math.PI/180;
_C_x = ts;
/* we want Bessel as fixed ellipsoid */
A = 6377397.155;
E = Math.Sqrt(Es = 0.006674372230614);
/* if latitude of projection center is not set, use 49d30'N */
Phi0 = projInfo.LatitudeOfOrigin != null ? projInfo.GetPhi0() : 0.863937979737193;
/* if center long is not set use 42d30'E of Ferro - 17d40' for Ferro */
/* that will correspond to using longitudes relative to greenwich */
/* as input and output, instead of lat/long relative to Ferro */
Lam0 = projInfo.CentralMeridian != null ? projInfo.GetLam0() : 0.7417649320975901 - 0.308341501185665;
/* if scale not set default to 0.9999 */
K0 = projInfo.CentralMeridian != null ? projInfo.GetLam0() : 0.9999;
if (!projInfo.Parameters.ContainsKey("czech")) return;
int temp = projInfo.ParamI("czech");
if (temp != 0) _czech = true;
}
/// <summary>
/// Initializes the transform using the parameters from the specified coordinate system information
/// </summary>
/// <param name="projInfo">A ProjectionInfo class contains all the standard and custom parameters needed to initialize this transform</param>
protected override void OnInit(ProjectionInfo projInfo)
{
double sinphi;
double degreesToRadians = projInfo.GeographicInfo.Unit.Radians;
_phi1 = projInfo.GetPhi1();
if(projInfo.StandardParallel2 != null)
{
_phi2 = projInfo.GetPhi1();
}
else
{
_phi2 = _phi1;
_phi1 = projInfo.GetPhi0();
}
if(Math.Abs(_phi1 + _phi2) < EPS10)throw new ProjectionException(21);
_n = sinphi = Math.Sin(_phi1);
double cosphi = Math.Cos(_phi1);
bool secant = Math.Abs(_phi1 - _phi2) >= EPS10;
_ellipse = projInfo.GeographicInfo.Datum.Spheroid.IsOblate();
if(_ellipse)
{
double m1 = Proj.Msfn(sinphi, cosphi, Es);
double ml1 = Proj.Tsfn(_phi1, sinphi, E);
if(secant)
{
sinphi = Math.Sin(_phi2);
_n = Math.Log(m1/ Proj.Msfn(sinphi, Math.Cos(_phi2), Es));
_n = _n/Math.Log(ml1/Proj.Tsfn(_phi2, sinphi, E));
}
_rho0 = m1*Math.Pow(ml1, -_n)/_n;
_c = _rho0;
if(Math.Abs(Math.Abs(Phi0) - HalfPi) < EPS10)
{
_rho0 = 0;
}
else
{
_rho0 *= Math.Pow(Proj.Tsfn(Phi0, Math.Sin(Phi0), E), _n);
}
}
else
{
if(secant)
{
_n = Math.Log(cosphi/Math.Cos(_phi2))/
Math.Log(Math.Tan(Math.PI/4 + .5*_phi2)/
Math.Tan(Math.PI/4 + .5*_phi1));
_c = cosphi*Math.Pow(Math.Tan(Math.PI/4 + .5*_phi1), _n)/_n;
}
if (Math.Abs(Math.Abs(Phi0) - HalfPi) < EPS10)
{
_rho0 = 0;
}
else
{
_rho0 = _c*Math.Pow(Math.Tan(Math.PI/4 + .5*Phi0), -_n);
}
}
}
/// <summary>
/// Initializes the parameters from the projection info
/// </summary>
/// <param name="proj">The projection information used to control this transform</param>
public void Init(ProjectionInfo proj)
{
// Setup protected values common to all the projections that inherit from this projection
Es = proj.GeographicInfo.Datum.Spheroid.EccentricitySquared();
if (proj.LatitudeOfOrigin != null) Phi0 = proj.GetPhi0();
if(proj.CentralMeridian != null) Lam0 = proj.GetLam0();
if(proj.FalseEasting != null) X0 = proj.FalseEasting.Value;
if(proj.FalseNorthing != null) Y0 = proj.FalseNorthing.Value;
K0 = proj.ScaleFactor;
A = proj.GeographicInfo.Datum.Spheroid.EquatorialRadius;
E = proj.GeographicInfo.Datum.Spheroid.Eccentricity();
Ra = 1/A;
OneEs = 1 - Es;
ROneEs = 1/OneEs;
ToMeter = 1;
FromMeter = 1;
//_datumParams = proj.GeographicInfo.Datum.ToWGS84;
if(proj.Unit != null)
{
ToMeter = proj.Unit.Meters;
FromMeter = 1/proj.Unit.Meters;
}
if (Es != 0)
{
IsElliptical = true;
}
OnInit(proj);
}
