Class ConstrainedAstrometryModel

Inheritance Relationships

Base Type

Class Documentation

class ConstrainedAstrometryModel : public lsst::jointcal::AstrometryModel

A multi-component model, fitting mappings for sensors and visits simultaneously.

This is the model used to fit mappings as the combination of a transformation depending on the chip number (instrument model) and a transformation per visit (anamorphism). The two-transformation Mapping required for this model is ChipVisitAstrometryMapping. This modeling of distortions is meant for a set of images from a single mosaic imager.

Parameters

  • ccdImageList: The exposures that will be fit.

  • projectionHandler: The projection from “Sky” (where the “true” coordinates live) to “Tangent Plane” (where the fitting occurs).

  • chipOrder: The polynomial order of the pixel->focal plane mapping for each sensor.

  • visitOrder: The polynomial order of the focal plane->tangent plane mapping for each visit.

Public Functions

ConstrainedAstrometryModel(CcdImageList const &ccdImageList, std::shared_ptr<ProjectionHandler const> projectionHandler, int chipOrder, int visitOrder)
ConstrainedAstrometryModel(ConstrainedAstrometryModel const&)

No copy or move: there is only ever one instance of a given model (i.e. per ccd+visit)

ConstrainedAstrometryModel(ConstrainedAstrometryModel&&)
ConstrainedAstrometryModel &operator=(ConstrainedAstrometryModel const&)
ConstrainedAstrometryModel &operator=(ConstrainedAstrometryModel&&)
AstrometryMapping const *getMapping(CcdImage const&) const

Mapping associated to a given CcdImage.

Eigen::Index assignIndices(std::string const &whatToFit, Eigen::Index firstIndex)

Positions the various parameter sets into the parameter vector, starting at firstIndex.

void offsetParams(Eigen::VectorXd const &Delta)

Dispaches the offsets after a fit step into the actual locations of parameters.

void freezeErrorTransform()

From there on, measurement errors are propagated using the current transforms (and no longer evolve).

std::size_t getTotalParameters() const

Return the total number of parameters in this model.

AstrometryTransform const &getChipTransform(CcdIdType const chip) const

Access to mappings.

AstrometryTransform const &getVisitTransform(VisitIdType const &visit) const

Access to mappings.

std::vector<VisitIdType> getVisits() const

Access to array of visits involved in the solution.

const std::shared_ptr<AstrometryTransform const> getSkyToTangentPlane(CcdImage const &ccdImage) const

The mapping of sky coordinates (i.e. the coordinate system in which fitted stars are reported) onto the Tangent plane (into which the pixel coordinates are transformed).

std::shared_ptr<afw::geom::SkyWcs> makeSkyWcs(CcdImage const &ccdImage) const

Make a SkyWcs that contains this model.

Return

SkyWcs containing this model.

Parameters

  • ccdImage: The exposure to create the SkyWcs for.