public void GetRADEFromImageCoords(double x, double y, out double RADeg, out double DEDeg)
{
double xTang = m_A * x + m_B * y + m_C;
double yTang = m_D * x + m_E * y + m_F;
TangentPlane.TangentToCelestial(xTang, yTang, m_RA0Deg, m_DE0Deg, out RADeg, out DEDeg);
}
public void GetRADEFromImageCoords(double x, double y, out double RADeg, out double DE)
{
double xTang, yTang;
m_SolvedConstants.GetTangentCoordsFromImageCoords(x, y, out xTang, out yTang);
TangentPlane.TangentToCelestial(xTang, yTang, m_RA0Deg, m_DE0Deg, out RADeg, out DE);
}
public void GetImageCoordsFromRADE(double RADeg, double DEDeg, out double x, out double y)
{
double xTang, yTang;
TangentPlane.CelestialToTangent(RADeg, DEDeg, m_RA0Deg, m_DE0Deg, out xTang, out yTang);
x = m_A1 * xTang + m_B1 * yTang + m_C1;
y = m_D1 * xTang + m_E1 * yTang + m_F1;
}
public void GetImageCoordsFromRADE(double RADeg, double DE, out double x, out double y)
{
double xTang, yTang;
TangentPlane.CelestialToTangent(RADeg, DE, m_RA0Deg, m_DE0Deg, out xTang, out yTang);
m_SolvedConstants.GetImageCoordsFromTangentCoords(xTang, yTang, out x, out y);
}
public void GetRADEFromImageCoords(double x, double y, out double RADeg, out double DE)
{
double mtxX, mtxY;
m_Image.ImageCoordsToMatrixCoords(x - m_Image.CenterXImage, y - m_Image.CenterYImage, out mtxX, out mtxY, CoordinateReference.Center);
double xt = Math.Cos(EtaRadians) * mtxX - Math.Sin(EtaRadians) * mtxY;
double yt = Math.Sin(EtaRadians) * mtxX + Math.Cos(EtaRadians) * mtxY;
double tangentalX = xt * cellWidth / (focalLength * 1000.0);
double tangentalY = yt * cellHeight / (focalLength * 1000.0);
tangentalY = -tangentalY;
TangentPlane.TangentToCelestial(tangentalX, tangentalY, m_RA0Deg, this.m_DE0Deg, out RADeg, out DE);
}
public void GetImageCoordsFromRADE(double RADeg, double DE, out double x, out double y)
{
double tangentalX, tangentalY;
TangentPlane.CelestialToTangent(RADeg, DE, this.m_RA0Deg, this.m_DE0Deg, out tangentalX, out tangentalY);
tangentalY = -tangentalY;
double plateX = tangentalX * (focalLength * 1000.0 / cellWidth);
double plateY = tangentalY * (focalLength * 1000.0 / cellHeight);
double mtxX = Math.Cos(EtaRadians) * plateX + Math.Sin(EtaRadians) * plateY;
double mtxY = Math.Cos(EtaRadians) * plateY - Math.Sin(EtaRadians) * plateX;
m_Image.MatrixCoordsToImageCoords(mtxX, mtxY, out x, out y, CoordinateReference.Center);
x += m_Image.CenterXImage;
y += m_Image.CenterYImage;
}
private PlateConstStarPair AddStar(double x, double RADeg, double y, double DE, double mag, int intensity, double detectionCertainty, bool isSaturated)
{
double xExpected, yExpected;
TangentPlane.CelestialToTangent(RADeg, DE, m_Tangent_RA0, m_Tangent_DE0, out xExpected, out yExpected);
PlateConstStarPair pair = new PlateConstStarPair();
pair.x = x;
pair.y = y;
pair.ExpectedXTang = xExpected;
pair.ExpectedYTang = yExpected;
pair.Mag = mag;
pair.Intensity = (uint)intensity;
pair.IsSaturated = isSaturated;
pair.DetectionCertainty = detectionCertainty;
m_Pairs.Add(pair);
return(pair);
}
public ThreeStarFit(
AstroPlate image,
StarPair pair1,
StarPair pair2,
StarPair pair3)
{
m_Image = image;
// X1 = a*x1 + b*y1 + c
// Y1 = d*x1 + e*y1 + f
// X2 = a*x2 + b*y2 + c
// Y2 = d*x2 + e*y2 + f
// X3 = a*x3 + b*y3 + c
// Y3 = d*x3 + e*y3 + f
// NOTE: First do a SimpleRaDec fit to get the RA0/DE0
double DX12 = pair1.RADeg - pair2.RADeg;
double DX23 = pair2.RADeg - pair3.RADeg;
double DY12 = pair1.DEDeg - pair2.DEDeg;
double DY23 = pair2.DEDeg - pair3.DEDeg;
double dx12 = pair1.XImage - pair2.XImage;
double dx23 = pair2.XImage - pair3.XImage;
double dy12 = pair1.YImage - pair2.YImage;
double dy23 = pair2.YImage - pair3.YImage;
// Singularity
if (DX12 * DX23 * DY12 * DY23 * dx12 * dx23 * dy12 * dy23 == 0)
{
m_IsSingularity = true;
return;
}
m_A = (DX12 * dy23 - DX23 * dy12) / (dx12 * dy23 - dx23 * dy12);
m_B = (DX12 - m_A * dx12) / dy12;
m_C = pair1.RADeg - m_A * pair1.XImage - m_B * pair1.YImage;
m_D = (DY12 * dy23 - DY23 * dy12) / (dx12 * dy23 - dx23 * dy12);
m_E = (DY12 - m_D * dx12) / dy12;
m_F = pair1.DEDeg - m_D * pair1.XImage - m_E * pair1.YImage;
m_RA0Deg = m_A * m_Image.CenterXImage + m_B * m_Image.CenterYImage + m_C;
m_DE0Deg = m_D * m_Image.CenterXImage + m_E * m_Image.CenterYImage + m_F;
// NOTE: Then do the Tangental solution
TangentPlane.CelestialToTangent(pair1.RADeg, pair1.DEDeg, m_RA0Deg, m_DE0Deg, out pair1.XTangent, out pair1.YTangent);
TangentPlane.CelestialToTangent(pair2.RADeg, pair2.DEDeg, m_RA0Deg, m_DE0Deg, out pair2.XTangent, out pair2.YTangent);
TangentPlane.CelestialToTangent(pair3.RADeg, pair3.DEDeg, m_RA0Deg, m_DE0Deg, out pair3.XTangent, out pair3.YTangent);
DX12 = pair1.XTangent - pair2.XTangent;
DX23 = pair2.XTangent - pair3.XTangent;
DY12 = pair1.YTangent - pair2.YTangent;
DY23 = pair2.YTangent - pair3.YTangent;
m_A = (DX12 * dy23 - DX23 * dy12) / (dx12 * dy23 - dx23 * dy12);
m_B = (DX12 - m_A * dx12) / dy12;
m_C = pair1.XTangent - m_A * pair1.XImage - m_B * pair1.YImage;
m_D = (DY12 * dy23 - DY23 * dy12) / (dx12 * dy23 - dx23 * dy12);
m_E = (DY12 - m_D * dx12) / dy12;
m_F = pair1.YTangent - m_D * pair1.XImage - m_E * pair1.YImage;
m_A1 = m_E / (m_E * m_A - m_B * m_D);
m_B1 = -m_B / (m_E * m_A - m_B * m_D);
m_C1 = (m_B * m_F - m_C * m_E) / (m_E * m_A - m_B * m_D);
m_D1 = m_D / (m_B * m_D - m_A * m_E);
m_E1 = -m_A / (m_B * m_D - m_A * m_E);
m_F1 = (m_A * m_F - m_C * m_D) / (m_B * m_D - m_A * m_E);
m_IsSolved = true;
}
private bool LeastSquareSolve(double ra0Deg, double de0Deg, int minNumberOfStars)
{
int[] NUM_CONSTANTS = new int[] { 3, 6, 10 };
SafeMatrix A = new SafeMatrix(m_StarPairs.Count, NUM_CONSTANTS[(int)m_FitOrder]);
SafeMatrix X = new SafeMatrix(m_StarPairs.Count, 1);
SafeMatrix Y = new SafeMatrix(m_StarPairs.Count, 1);
SafeMatrix AReverse = new SafeMatrix(m_StarPairs.Count, NUM_CONSTANTS[(int)m_FitOrder]);
SafeMatrix XReverse = new SafeMatrix(m_StarPairs.Count, 1);
SafeMatrix YReverse = new SafeMatrix(m_StarPairs.Count, 1);
int numStars = 0;
for (int i = 0; i < m_StarPairs.Count; i++)
{
m_StarPairs[i].FitInfo.UsedInSolution = false;
if (m_StarPairs[i].FitInfo.ExcludedForHighResidual)
{
continue;
}
numStars++;
m_StarPairs[i].FitInfo.UsedInSolution = true;
ConfigureObservation(A, AReverse, i);
X[i, 0] = m_StarPairs[i].ExpectedXTang;
Y[i, 0] = m_StarPairs[i].ExpectedYTang;
XReverse[i, 0] = m_StarPairs[i].x;
YReverse[i, 0] = m_StarPairs[i].y;
}
// Insufficient stars to solve the plate
if (numStars < minNumberOfStars)
{
if (TangraConfig.Settings.TraceLevels.PlateSolving.TraceVerbose())
{
Debug.WriteLine(string.Format("Insufficient number of stars to do a fit. At least {0} stars requested.", minNumberOfStars));
}
return(false);
}
SafeMatrix a_T = A.Transpose();
SafeMatrix aa = a_T * A;
SafeMatrix aa_inv = aa.Inverse();
SafeMatrix bx = (aa_inv * a_T) * X;
SafeMatrix by = (aa_inv * a_T) * Y;
if (ReadSolvedConstants(bx, by))
{
a_T = AReverse.Transpose();
aa = a_T * AReverse;
aa_inv = aa.Inverse();
bx = (aa_inv * a_T) * XReverse;
by = (aa_inv * a_T) * YReverse;
ReadSolvedReversedConstants(bx, by);
}
double residualSum = 0;
double residualSumArcSecRA = 0;
double residualSumArcSecDE = 0;
int numResiduals = 0;
var absResRAArcSec = new List <double>();
var absResDEArcSec = new List <double>();
for (int i = 0; i < m_StarPairs.Count; i++)
{
double computedXTang, computedYTang;
GetTangentCoordsFromImageCoords(m_StarPairs[i].x, m_StarPairs[i].y, out computedXTang, out computedYTang);
m_StarPairs[i].FitInfo.ResidualXTang = m_StarPairs[i].ExpectedXTang - computedXTang;
m_StarPairs[i].FitInfo.ResidualYTang = m_StarPairs[i].ExpectedYTang - computedYTang;
double raComp, deComp;
TangentPlane.TangentToCelestial(computedXTang, computedYTang, ra0Deg, de0Deg, out raComp, out deComp);
m_StarPairs[i].FitInfo.ResidualRAArcSec = 3600.0 * AngleUtility.Elongation(m_StarPairs[i].RADeg, 0, raComp, 0);
m_StarPairs[i].FitInfo.ResidualDEArcSec = 3600.0 * AngleUtility.Elongation(0, m_StarPairs[i].DEDeg, 0, deComp);
if (!m_StarPairs[i].FitInfo.UsedInSolution)
{
continue;
}
numResiduals++;
residualSum += Math.Abs(m_StarPairs[i].FitInfo.ResidualXTang * m_StarPairs[i].FitInfo.ResidualYTang);
residualSumArcSecRA += m_StarPairs[i].FitInfo.ResidualRAArcSec * m_StarPairs[i].FitInfo.ResidualRAArcSec;
residualSumArcSecDE += m_StarPairs[i].FitInfo.ResidualDEArcSec * m_StarPairs[i].FitInfo.ResidualDEArcSec;
absResRAArcSec.Add(Math.Abs(m_StarPairs[i].FitInfo.ResidualRAArcSec));
absResDEArcSec.Add(Math.Abs(m_StarPairs[i].FitInfo.ResidualDEArcSec));
}
Variance = residualSum / (numResiduals - 1);
VarianceArcSecRA = residualSumArcSecRA / (numResiduals - 1);
VarianceArcSecDE = residualSumArcSecDE / (numResiduals - 1);
// Uncertainty based on Astrometrica's formula of median residual devided by SQRT(num stars)
UncertaintyArcSecRA = absResRAArcSec.Median() / Math.Sqrt(numResiduals);
UncertaintyArcSecDE = absResDEArcSec.Median() / Math.Sqrt(numResiduals);
return(true);
}
