lsst::jointcal::TanSipPixelToRaDec Class Reference

Implements the (forward) SIP distorsion scheme. More...

#include <AstrometryTransform.h>

Inheritance diagram for lsst::jointcal::TanSipPixelToRaDec:

Public Member Functions
	TanSipPixelToRaDec (AstrometryTransformLinear const &pixToTan, Point const &tangentPoint, const AstrometryTransformPolynomial *corrections=nullptr)
	pixToTan describes the transform from pix to tangent plane (degrees).
AstrometryTransformPolynomial	getPixelToTangentPlane () const
	the transformation from pixels to tangent plane (degrees)
virtual void	pixToTangentPlane (double xPixel, double yPixel, double &xTangentPlane, double &yTangentPlane) const
	transforms from pixel space to tangent plane (degrees)
	TanSipPixelToRaDec ()
std::unique_ptr< AstrometryTransform >	inverseTransform (double precision, const Frame &region) const
	Inverse transform: returns a TanRaDecToPixel if there are no corrections, or the iterative solver if there are.
std::unique_ptr< AstrometryTransform >	clone () const
	returns a copy (allocated by new) of the transformation.
void	print (std::ostream &out) const
	prints the transform coefficients to stream.
double	fit (StarMatchList const &starMatchList)
	Not implemented yet, because we do it otherwise.
void	apply (double xIn, double yIn, double &xOut, double &yOut) const
	Transform pixels to ICRS RA, Dec in degrees.
virtual void	apply (double xIn, double yIn, double &xOut, double &yOut) const=0
void	apply (Point const &in, Point &out) const
	applies the tranfo to in and writes into out. Is indeed virtual.
Point	apply (Point const &in) const
	All these apply(..) shadow the virtual one in derived classes, unless one writes "using AstrometryTransform::apply".
Frame	apply (Frame const &inputframe, bool inscribed) const
	Transform a bounding box, taking either the inscribed or circumscribed box.
Point	getTangentPoint () const
	Get the sky origin (CRVAL in FITS WCS terminology) in degrees.
AstrometryTransformLinear	getLinPart () const
	The Linear part (corresponding to CD's and CRPIX's)
const AstrometryTransformPolynomial *	getCorr () const
	Get a non-owning pointer to the correction transform polynomial.
void	setCorrections (std::unique_ptr< AstrometryTransformPolynomial > corrections)
	Assign the correction polynomial (what it means is left to derived classes)
Point	getCrPix () const
	Get the pixel origin of the WCS (CRPIX in FITS WCS terminology, but zero-based)
std::string	__str__ () const
void	transformStar (FatPoint &in) const
virtual double	getJacobian (Point const &point) const
	returns the local jacobian.
virtual double	getJacobian (double x, double y) const
	returns the local jacobian.
virtual std::unique_ptr< AstrometryTransform >	composeAndReduce (AstrometryTransform const &right) const
	Return a reduced composition of newTransform = this(right()), or nullptr if it cannot be reduced.
virtual void	computeDerivative (Point const &where, AstrometryTransformLinear &derivative, double step=0.01) const
	Computes the local Derivative of a transform, w.r.t.
virtual AstrometryTransformLinear	linearApproximation (Point const &where, double step=0.01) const
	linear (local) approximation.
virtual void	transformPosAndErrors (const FatPoint &in, FatPoint &out) const
virtual void	transformErrors (Point const &where, const double *vIn, double *vOut) const
	transform errors (represented as double[3] in order V(xx),V(yy),Cov(xy))
void	getParams (double *params) const
	params should be at least Npar() long
void	offsetParams (Eigen::VectorXd const &delta)
virtual double	paramRef (Eigen::Index i) const
virtual double &	paramRef (Eigen::Index i)
virtual void	paramDerivatives (Point const &where, double *dx, double *dy) const
	Derivative w.r.t parameters.
virtual std::unique_ptr< AstrometryTransform >	roughInverse (const Frame &region) const
	Rough inverse.
virtual std::size_t	getNpar () const
	returns the number of parameters (to compute chi2's)
virtual std::shared_ptr< ast::Mapping >	toAstMap (jointcal::Frame const &domain) const
	Create an equivalent AST mapping for this transformation, including an analytic inverse if possible.
void	write (const std::string &fileName) const
virtual void	write (std::ostream &stream) const

Protected Attributes
AstrometryTransformLinear	linPixelToTan
std::unique_ptr< AstrometryTransformPolynomial >	corr
double	ra0 {}
double	dec0 {}
double	cos0 {}
double	sin0 {}

Detailed Description

Implements the (forward) SIP distorsion scheme.

Definition at line 672 of file AstrometryTransform.h.

Constructor & Destructor Documentation

TanSipPixelToRaDec() [1/2]

lsst::jointcal::TanSipPixelToRaDec::TanSipPixelToRaDec	(	AstrometryTransformLinear const &	pixToTan,
		Point const &	tangentPoint,
		const AstrometryTransformPolynomial *	corrections = nullptr )

pixToTan describes the transform from pix to tangent plane (degrees).

TangentPoint in degrees. Corrections are applied before Lin.

Definition at line 1589 of file AstrometryTransform.cc.

        : BaseTanWcs(pixToTan, tangentPoint, corrections) {}

TanSipPixelToRaDec() [2/2]

lsst::jointcal::TanSipPixelToRaDec::TanSipPixelToRaDec

(

)

Definition at line 1594 of file AstrometryTransform.cc.

: BaseTanWcs(AstrometryTransformLinear(), Point(0, 0), nullptr) {}

Member Function Documentation

__str__()

std::string lsst::jointcal::AstrometryTransform::__str__ ( ) const

inlineinherited

Definition at line 94 of file AstrometryTransform.h.

                              {
        std::stringstream s;
        print(s);
        return s.str();
    }

apply() [1/5]

void lsst::jointcal::BaseTanWcs::apply ( double xIn, double yIn, double & xOut, double & yOut ) const

virtualinherited

Transform pixels to ICRS RA, Dec in degrees.

Implements lsst::jointcal::AstrometryTransform.

Reimplemented in lsst::jointcal::TanPixelToRaDec.

Definition at line 1426 of file AstrometryTransform.cc.

                                                                                           {
    double l, m;                        // radians in the tangent plane
    pixToTangentPlane(xIn, yIn, l, m);  // l, m in degrees.
    l = deg2rad(l);
    m = deg2rad(m);  // now in radians
                     // Code inspired from worldpos.c in wcssubs (ancestor of the wcslib)
                     /* At variance with wcslib, it collapses the projection to a plane
                        and expression of sidereal cooordinates into a single set of
                        operations. */
    double dect = cos0 - m * sin0;
    if (dect == 0) {
        LOGL_WARN(_log, "No sidereal coordinates at pole!");
        xOut = 0;
        yOut = 0;
        return;
    }
    double rat = ra0 + atan2(l, dect);
    dect = atan(std::cos(rat - ra0) * (m * cos0 + sin0) / dect);
    if (rat - ra0 > M_PI) rat -= (2. * M_PI);
    if (rat - ra0 < -M_PI) rat += (2. * M_PI);
    if (rat < 0.0) rat += (2. * M_PI);
    // convert to degree
    xOut = rad2deg(rat);
    yOut = rad2deg(dect);
}

apply() [2/5]

virtual void lsst::jointcal::AstrometryTransform::apply ( double xIn, double yIn, double & xOut, double & yOut ) const

virtualinherited

Implements lsst::jointcal::AstrometryTransform.

Reimplemented in lsst::jointcal::TanPixelToRaDec.

apply() [3/5]

Frame lsst::jointcal::AstrometryTransform::apply ( Frame const & inputframe, bool inscribed ) const

inherited

Transform a bounding box, taking either the inscribed or circumscribed box.

Parameters

[in]	inputframe	The frame to be transformed.
[in]	inscribed	Return the inscribed (true) or circumscribed (false) box.

Returns

The transformed frame.

Definition at line 89 of file AstrometryTransform.cc.

                                                                              {
    // 2 opposite corners
    double xtmin1, xtmax1, ytmin1, ytmax1;
    apply(inputframe.xMin, inputframe.yMin, xtmin1, ytmin1);
    apply(inputframe.xMax, inputframe.yMax, xtmax1, ytmax1);
    Frame fr1(std::min(xtmin1, xtmax1), std::min(ytmin1, ytmax1), std::max(xtmin1, xtmax1),
              std::max(ytmin1, ytmax1));
    // 2 other corners
    double xtmin2, xtmax2, ytmin2, ytmax2;
    apply(inputframe.xMin, inputframe.yMax, xtmin2, ytmax2);
    apply(inputframe.xMax, inputframe.yMin, xtmax2, ytmin2);
    Frame fr2(std::min(xtmin2, xtmax2), std::min(ytmin2, ytmax2), std::max(xtmin2, xtmax2),
              std::max(ytmin2, ytmax2));
 
    if (inscribed) return fr1 * fr2;
    return fr1 + fr2;
}

apply() [4/5]

Point lsst::jointcal::AstrometryTransform::apply ( Point const & in ) const

inlineinherited

All these apply(..) shadow the virtual one in derived classes, unless one writes "using AstrometryTransform::apply".

Definition at line 75 of file AstrometryTransform.h.

                                       {
        double xout, yout;
        apply(in.x, in.y, xout, yout);
        return Point(xout, yout);
    }

apply() [5/5]

void lsst::jointcal::AstrometryTransform::apply ( Point const & in, Point & out ) const

inlineinherited

applies the tranfo to in and writes into out. Is indeed virtual.

Definition at line 71 of file AstrometryTransform.h.

{ apply(in.x, in.y, out.x, out.y); }

clone()

std::unique_ptr< AstrometryTransform > lsst::jointcal::TanSipPixelToRaDec::clone ( ) const

virtual

returns a copy (allocated by new) of the transformation.

Implements lsst::jointcal::AstrometryTransform.

Definition at line 1630 of file AstrometryTransform.cc.

                                                                   {
    return std::unique_ptr<AstrometryTransform>(
            new TanSipPixelToRaDec(getLinPart(), getTangentPoint(), corr.get()));
}

composeAndReduce()

std::unique_ptr< AstrometryTransform > lsst::jointcal::AstrometryTransform::composeAndReduce ( AstrometryTransform const & right ) const

virtualinherited

Return a reduced composition of newTransform = this(right()), or nullptr if it cannot be reduced.

"Reduced" in this context means that they are capable of being merged into a single transform, for example, for two polynomials:

\[ f(x) = 1 + x^2, g(x) = -1 + 3x \]

we would have h = f.composeAndReduce(g) == 2 - 6x + 9x^2.

To be overloaded by derived classes if they can properly reduce the composition.

Parameters

right

The transform to apply first.

Returns

The new reduced and composed AstrometryTransform, or nullptr if no such reduction is possible.

Reimplemented in lsst::jointcal::AstrometryTransformPolynomial, lsst::jointcal::TanPixelToRaDec, and lsst::jointcal::AstrometryTransformIdentity.

Definition at line 95 of file AstrometryTransform.cc.

                                           {  // by default no way to compose
    return std::unique_ptr<AstrometryTransform>(nullptr);
}

computeDerivative()

void lsst::jointcal::AstrometryTransform::computeDerivative ( Point const & where, AstrometryTransformLinear & derivative, double step = 0.01 ) const

virtualinherited

Computes the local Derivative of a transform, w.r.t.

the Derivative is represented by a AstrometryTransformLinear, in which (hopefully), the offset terms are zero.

position.

Step is used for numerical derivation.

Derivative should transform a vector of offsets into a vector of offsets.

Reimplemented in lsst::jointcal::AstrometryTransformIdentity, lsst::jointcal::AstrometryTransformPolynomial, and lsst::jointcal::AstrometryTransformLinear.

Definition at line 119 of file AstrometryTransform.cc.

                                                                     {
    double x = where.x;
    double y = where.y;
    double xp0, yp0;
    apply(x, y, xp0, yp0);
 
    double xp, yp;
    apply(x + step, y, xp, yp);
    derivative.a11() = (xp - xp0) / step;
    derivative.a21() = (yp - yp0) / step;
    apply(x, y + step, xp, yp);
    derivative.a12() = (xp - xp0) / step;
    derivative.a22() = (yp - yp0) / step;
    derivative.dx() = 0;
    derivative.dy() = 0;
}

fit()

double lsst::jointcal::TanSipPixelToRaDec::fit ( StarMatchList const & starMatchList )

virtual

Not implemented yet, because we do it otherwise.

Implements lsst::jointcal::AstrometryTransform.

Definition at line 1644 of file AstrometryTransform.cc.

                                                    {
    /* OK we could implement this routine, but it is
       probably useless since to do the match, we have to
       project from sky to tangent plane. When a match is
       found, it is easier to carry out the fit in the
       tangent plane, rather than going back to the celestial
       sphere (and reproject to fit...). Anyway if this
       message shows up, we'll think about it.
    */
    throw LSST_EXCEPT(pex::exceptions::InvalidParameterError,
                      "TanSipPixelToRaDec::fit is NOT implemented (although it is doable)) ");
    return -1;
}

getCorr()

const AstrometryTransformPolynomial * lsst::jointcal::BaseTanWcs::getCorr ( ) const

inlineinherited

Get a non-owning pointer to the correction transform polynomial.

Definition at line 595 of file AstrometryTransform.h.

{ return corr.get(); }

getCrPix()

Point lsst::jointcal::BaseTanWcs::getCrPix ( ) const

inherited

Get the pixel origin of the WCS (CRPIX in FITS WCS terminology, but zero-based)

Definition at line 1460 of file AstrometryTransform.cc.

                                 {
    /* CRPIX's are defined by:
                      ( CD1_1  CD1_2 )   (x - crpix1)
       transformed =  (              ) * (          )
                      ( CD2_1  CD2_2 )   (y - crpix2)
 
       so that CrPix is the point which transforms to (0,0)
    */
    const AstrometryTransformLinear inverse = linPixelToTan.inverted();
    return Point(inverse.Dx(), inverse.Dy());
}

getJacobian() [1/2]

double lsst::jointcal::AstrometryTransform::getJacobian ( double x, double y ) const

virtualinherited

returns the local jacobian.

Definition at line 100 of file AstrometryTransform.cc.

                                                                            {
    double x2, y2;
    double eps = x * 0.01;
    if (eps == 0) eps = 0.01;
    apply(x, y, x2, y2);
    double dxdx, dydx;
    apply(x + eps, y, dxdx, dydx);
    dxdx -= x2;
    dydx -= y2;
    double dxdy, dydy;
    apply(x, y + eps, dxdy, dydy);
    dxdy -= x2;
    dydy -= y2;
    return ((dxdx * dydy - dxdy * dydx) / (eps * eps));
}

getJacobian() [2/2]

virtual double lsst::jointcal::AstrometryTransform::getJacobian ( Point const & point ) const

inlinevirtualinherited

returns the local jacobian.

Definition at line 110 of file AstrometryTransform.h.

{ return getJacobian(point.x, point.y); }

getLinPart()

AstrometryTransformLinear lsst::jointcal::BaseTanWcs::getLinPart ( ) const

inherited

The Linear part (corresponding to CD's and CRPIX's)

Definition at line 1454 of file AstrometryTransform.cc.

{ return linPixelToTan; }

getNpar()

virtual std::size_t lsst::jointcal::AstrometryTransform::getNpar ( ) const

inlinevirtualinherited

returns the number of parameters (to compute chi2's)

Reimplemented in lsst::jointcal::AstrometryTransformLinearShift, lsst::jointcal::AstrometryTransformLinearRot, lsst::jointcal::AstrometryTransformLinearScale, lsst::jointcal::AstrometryTransformIdentity, and lsst::jointcal::AstrometryTransformPolynomial.

Definition at line 180 of file AstrometryTransform.h.

{ return 0; }

getParams()

void lsst::jointcal::AstrometryTransform::getParams ( double * params ) const

inherited

params should be at least Npar() long

Definition at line 217 of file AstrometryTransform.cc.

                                                        {
    std::size_t npar = getNpar();
    for (std::size_t i = 0; i < npar; ++i) params[i] = paramRef(i);
}

getPixelToTangentPlane()

AstrometryTransformPolynomial lsst::jointcal::TanSipPixelToRaDec::getPixelToTangentPlane ( ) const

virtual

the transformation from pixels to tangent plane (degrees)

Implements lsst::jointcal::BaseTanWcs.

Definition at line 1612 of file AstrometryTransform.cc.

                                                                               {
    if (corr)
        return AstrometryTransformPolynomial(linPixelToTan) * (*corr);
    else
        return linPixelToTan;
}

getTangentPoint()

Point lsst::jointcal::BaseTanWcs::getTangentPoint ( ) const

inherited

Get the sky origin (CRVAL in FITS WCS terminology) in degrees.

Definition at line 1452 of file AstrometryTransform.cc.

{ return Point(rad2deg(ra0), rad2deg(dec0)); }

inverseTransform()

std::unique_ptr< AstrometryTransform > lsst::jointcal::TanSipPixelToRaDec::inverseTransform ( double precision, const Frame & region ) const

virtual

Inverse transform: returns a TanRaDecToPixel if there are no corrections, or the iterative solver if there are.

Reimplemented from lsst::jointcal::AstrometryTransform.

Definition at line 1606 of file AstrometryTransform.cc.

              { /* We have not implemented (yet) the reverse corrections available in SIP */
    return std::unique_ptr<AstrometryTransform>(new AstrometryTransformInverse(this, precision, region));
}

linearApproximation()

AstrometryTransformLinear lsst::jointcal::AstrometryTransform::linearApproximation ( Point const & where, double step = 0.01 ) const

virtualinherited

linear (local) approximation.

Reimplemented in lsst::jointcal::AstrometryTransformIdentity, and lsst::jointcal::AstrometryTransformLinear.

Definition at line 137 of file AstrometryTransform.cc.

                                                                                            {
    Point outwhere = apply(where);
    AstrometryTransformLinear der;
    computeDerivative(where, der, step);
    return AstrometryTransformLinearShift(outwhere.x, outwhere.y) * der *
           AstrometryTransformLinearShift(-where.x, -where.y);
}

offsetParams()

void lsst::jointcal::AstrometryTransform::offsetParams ( Eigen::VectorXd const & delta )

inherited

Definition at line 222 of file AstrometryTransform.cc.

                                                                 {
    std::size_t npar = getNpar();
    for (std::size_t i = 0; i < npar; ++i) paramRef(i) += delta[i];
}

paramDerivatives()

void lsst::jointcal::AstrometryTransform::paramDerivatives ( Point const & where, double * dx, double * dy ) const

virtualinherited

Derivative w.r.t parameters.

Derivatives should be al least 2*NPar long. first Npar, for x, last Npar for y.

Reimplemented in lsst::jointcal::AstrometryTransformPolynomial.

Definition at line 237 of file AstrometryTransform.cc.

                                                                                  {
    throw LSST_EXCEPT(pex::exceptions::InvalidParameterError,
                      "AstrometryTransform::paramDerivatives() should never be called ");
}

paramRef() [1/2]

double & lsst::jointcal::AstrometryTransform::paramRef ( Eigen::Index i )

virtualinherited

Reimplemented in lsst::jointcal::AstrometryTransformPolynomial.

Definition at line 232 of file AstrometryTransform.cc.

                                                      {
    throw LSST_EXCEPT(pex::exceptions::InvalidParameterError,
                      "AstrometryTransform::paramRef should never be called ");
}

paramRef() [2/2]

double lsst::jointcal::AstrometryTransform::paramRef ( Eigen::Index i ) const

virtualinherited

Reimplemented in lsst::jointcal::AstrometryTransformPolynomial.

Definition at line 227 of file AstrometryTransform.cc.

                                                           {
    throw LSST_EXCEPT(pex::exceptions::InvalidParameterError,
                      std::string("AstrometryTransform::paramRef should never be called "));
}

pixToTangentPlane()

void lsst::jointcal::TanSipPixelToRaDec::pixToTangentPlane ( double xPixel, double yPixel, double & xTangentPlane, double & yTangentPlane ) const

virtual

transforms from pixel space to tangent plane (degrees)

Implements lsst::jointcal::BaseTanWcs.

Definition at line 1619 of file AstrometryTransform.cc.

                                                                        {
    // xTangentPlane, yTangentPlane returned in degrees
    if (corr) {
        double xtmp, ytmp;
        corr->apply(xPixel, yPixel, xtmp, ytmp);
        linPixelToTan.apply(xtmp, ytmp, xTangentPlane, yTangentPlane);
    } else
        linPixelToTan.apply(xPixel, yPixel, xTangentPlane, yTangentPlane);
}

print()

void lsst::jointcal::TanSipPixelToRaDec::print ( std::ostream & out ) const

virtual

prints the transform coefficients to stream.

Implements lsst::jointcal::AstrometryTransform.

Definition at line 1635 of file AstrometryTransform.cc.

                                                    {
    stream << " TanSipPixelToRaDec, lin part :" << endl << linPixelToTan;
    Point tp = getTangentPoint();
    stream << " tangent point " << tp.x << ' ' << tp.y << endl;
    Point crpix = getCrPix();
    stream << " crpix " << crpix.x << ' ' << crpix.y << endl;
    if (corr) stream << "PV correction: " << endl << *corr;
}

roughInverse()

std::unique_ptr< AstrometryTransform > lsst::jointcal::AstrometryTransform::roughInverse ( const Frame & region ) const

virtualinherited

Rough inverse.

Stored by the numerical inverter to guess starting point for the trials. Just here to enable overloading.

Reimplemented in lsst::jointcal::AstrometryTransformInverse, lsst::jointcal::TanPixelToRaDec, and lsst::jointcal::TanRaDecToPixel.

Definition at line 196 of file AstrometryTransform.cc.

                                                                                              {
    // "in" and "out" refer to the inverse direction.
    Point centerOut = region.getCenter();
    Point centerIn = apply(centerOut);
    AstrometryTransformLinear der;
    computeDerivative(centerOut, der, std::sqrt(region.getArea()) / 5.);
    der = der.inverted();
    der = AstrometryTransformLinearShift(centerOut.x, centerOut.y) * der *
          AstrometryTransformLinearShift(-centerIn.x, -centerIn.y);
    return std::unique_ptr<AstrometryTransform>(new AstrometryTransformLinear(der));
}

setCorrections()

void lsst::jointcal::BaseTanWcs::setCorrections ( std::unique_ptr< AstrometryTransformPolynomial > corrections )

inherited

Assign the correction polynomial (what it means is left to derived classes)

Definition at line 1456 of file AstrometryTransform.cc.

                                                                                        {
    corr = std::move(corrections);
}

toAstMap()

virtual std::shared_ptr< ast::Mapping > lsst::jointcal::AstrometryTransform::toAstMap ( jointcal::Frame const & domain ) const

inlinevirtualinherited

Create an equivalent AST mapping for this transformation, including an analytic inverse if possible.

Parameters

domain

The domain of the transform, to help find an inverse.

Returns

An AST Mapping that represents this transformation.

Reimplemented in lsst::jointcal::AstrometryTransformIdentity, and lsst::jointcal::AstrometryTransformPolynomial.

Definition at line 189 of file AstrometryTransform.h.

                                                                                  {
        throw std::logic_error("toAstMap is not implemented for this class.");
    }

transformErrors()

void lsst::jointcal::AstrometryTransform::transformErrors ( Point const & where, const double * vIn, double * vOut ) const

virtualinherited

transform errors (represented as double[3] in order V(xx),V(yy),Cov(xy))

Definition at line 163 of file AstrometryTransform.cc.

                                                                                                   {
    AstrometryTransformLinear der;
    computeDerivative(where, der, 0.01);
    double a11 = der.A11();
    double a22 = der.A22();
    double a21 = der.A21();
    double a12 = der.A12();
 
    /*      (a11 a12)          (vxx  vxy)
       M =  (       )  and V = (        )
            (a21 a22)          (xvy  vyy)
 
       Vxx = Vin[0], vyy = Vin[1], Vxy = Vin[2];
       we want to compute M*V*tp(M)
       A lin alg light package would be perfect...
    */
    int xx = 0;
    int yy = 1;
    int xy = 2;
    // M*V :
 
    double b11 = a11 * vIn[xx] + a12 * vIn[xy];
    double b22 = a21 * vIn[xy] + a22 * vIn[yy];
    double b12 = a11 * vIn[xy] + a12 * vIn[yy];
    double b21 = a21 * vIn[xx] + a22 * vIn[xy];
 
    // (M*V) * tp(M)
 
    vOut[xx] = b11 * a11 + b12 * a12;
    vOut[xy] = b11 * a21 + b12 * a22;
    vOut[yy] = b21 * a21 + b22 * a22;
}

transformPosAndErrors()

void lsst::jointcal::AstrometryTransform::transformPosAndErrors ( const FatPoint & in, FatPoint & out ) const

virtualinherited

Reimplemented in lsst::jointcal::TanRaDecToPixel, and lsst::jointcal::AstrometryTransformPolynomial.

Definition at line 146 of file AstrometryTransform.cc.

                                                                                       {
    FatPoint res;  // in case in and out are the same address...
    res = apply(in);
    AstrometryTransformLinear der;
    // could save a call here, since Derivative needs the transform of where that we already have
    // 0.01 may not be a very good idea in all cases. May be we should provide a way of altering that.
    computeDerivative(in, der, 0.01);
    double a11 = der.A11();
    double a22 = der.A22();
    double a21 = der.A21();
    double a12 = der.A12();
    res.vx = a11 * (a11 * in.vx + 2 * a12 * in.vxy) + a12 * a12 * in.vy;
    res.vy = a21 * a21 * in.vx + a22 * a22 * in.vy + 2. * a21 * a22 * in.vxy;
    res.vxy = a21 * a11 * in.vx + a22 * a12 * in.vy + (a21 * a12 + a11 * a22) * in.vxy;
    out = res;
}

transformStar()

void lsst::jointcal::AstrometryTransform::transformStar ( FatPoint & in ) const

inlineinherited

Definition at line 107 of file AstrometryTransform.h.

{ transformPosAndErrors(in, in); }

write() [1/2]

void lsst::jointcal::AstrometryTransform::write ( const std::string & fileName ) const

inherited

Definition at line 247 of file AstrometryTransform.cc.

                                                               {
    ofstream s(fileName.c_str());
    write(s);
    bool ok = !s.fail();
    s.close();
    if (!ok)
        throw LSST_EXCEPT(pex::exceptions::InvalidParameterError,
                          "AstrometryTransform::write, something went wrong for file " + fileName);
}

write() [2/2]

void lsst::jointcal::AstrometryTransform::write ( std::ostream & stream ) const

virtualinherited

Reimplemented in lsst::jointcal::AstrometryTransformIdentity, and lsst::jointcal::AstrometryTransformPolynomial.

Definition at line 257 of file AstrometryTransform.cc.

                                                     {
    throw LSST_EXCEPT(
            pex::exceptions::InvalidParameterError,
            "AstrometryTransform::write(ostream), should never be called. MEans that it is missing in some "
            "derived class ");
}

Member Data Documentation

corr

std::unique_ptr<AstrometryTransformPolynomial> lsst::jointcal::BaseTanWcs::corr

protectedinherited

Definition at line 616 of file AstrometryTransform.h.

cos0

double lsst::jointcal::BaseTanWcs::cos0 {}

protectedinherited

Definition at line 618 of file AstrometryTransform.h.

{}, sin0{};  // cos(dec0), sin(dec0)

dec0

double lsst::jointcal::BaseTanWcs::dec0 {}

protectedinherited

Definition at line 617 of file AstrometryTransform.h.

{}, dec0{};   // sky origin (radians)

linPixelToTan

AstrometryTransformLinear lsst::jointcal::BaseTanWcs::linPixelToTan

protectedinherited

Definition at line 614 of file AstrometryTransform.h.

ra0

double lsst::jointcal::BaseTanWcs::ra0 {}

protectedinherited

Definition at line 617 of file AstrometryTransform.h.

{}, dec0{};   // sky origin (radians)

sin0

double lsst::jointcal::BaseTanWcs::sin0 {}

protectedinherited

Definition at line 618 of file AstrometryTransform.h.

{}, sin0{};  // cos(dec0), sin(dec0)

---

The documentation for this class was generated from the following files:

• /j/snowflake/release/lsstsw/stack/lsst-scipipe-9.0.0/Linux64/jointcal/g82479be7b0+a4516e59e3/include/lsst/jointcal/AstrometryTransform.h
• /j/snowflake/release/lsstsw/stack/lsst-scipipe-9.0.0/Linux64/jointcal/g82479be7b0+a4516e59e3/src/AstrometryTransform.cc