private static void ConvertToProjected(ProjectionInfo dest, double[] xy, int startIndex, int numPoints)
{
double frmMeter = 1/dest.Unit.Meters;
bool geoc = dest.Geoc;
double lam0 = dest.GetLam0();
double roneEs = 1/(1 - dest.GeographicInfo.Datum.Spheroid.EccentricitySquared());
bool over = dest.Over;
double x0 = 0;
double y0 = 0;
if(dest.FalseEasting != null) x0 = dest.FalseEasting.Value;
if(dest.FalseNorthing != null) y0 = dest.FalseNorthing.Value;
double a = dest.GeographicInfo.Datum.Spheroid.EquatorialRadius;
for(int i = startIndex; i < numPoints; i++)
{
double lam = xy[2*i];
double phi = xy[2*i + 1];
double t = Math.Abs(phi - Math.PI/2);
if (t < Eps || Math.Abs(lam) > 10)
{
xy[2 * i] = double.PositiveInfinity;
xy[2 * i + 1] = double.PositiveInfinity;
continue;
}
if (Math.Abs(t) <= Eps)
{
xy[2 * i + 1] = phi < 0 ? -Math.PI / 2 : Math.PI / 2;
}
else if(geoc)
{
xy[2 * i + 1] = Math.Atan(roneEs * Math.Tan(phi));
}
xy[2 * i] -= lam0;
if (!over)
{
xy[2 * i] = Adjlon(xy[2 * i]);
}
}
// break this out because we don't want a chatty call to extension transforms
dest.Transform.Forward(xy, startIndex, numPoints);
for (int i = startIndex; i < numPoints; i++)
{
xy[2 * i] = frmMeter * (a * xy[2 * i] + x0);
xy[2 * i + 1] = frmMeter * (a * xy[2 * i + 1] + y0);
}
}
/// <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 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);
}
