Class AstrometryModel

Inheritance Relationships

Derived Types

Class Documentation

class AstrometryModel

Interface between AstrometryFit and the combinations of Mappings from pixels to some tangent plane (aka distortions).

Parameters

  • log: Logger to send messages to, to keep names consistent when logging.

Subclassed by lsst::jointcal::ConstrainedAstrometryModel, lsst::jointcal::SimpleAstrometryModel

Public Functions

AstrometryModel(LOG_LOGGER log)
std::size_t getNpar(CcdImage const &ccdImage) const

Return the number of parameters in the mapping of CcdImage.

virtual const AstrometryMapping *getMapping(CcdImage const&) const = 0

Mapping associated to a given CcdImage.

virtual Eigen::Index assignIndices(std::string const &whatToFit, Eigen::Index firstIndex) = 0

Assign indices to parameters involved in mappings, starting at firstIndex. Returns the highest assigned index.

virtual void offsetParams(Eigen::VectorXd const &delta) = 0

Offset the parameters by the provided amounts (by -delta).

The shifts are applied according to the indices given in assignIndices.

Parameters

  • [in] delta: vector of offsets to apply

virtual const std::shared_ptr<AstrometryTransform const> getSkyToTangentPlane(CcdImage const &ccdImage) const = 0

The transformation used to project the positions of FittedStars.

This defines the coordinate system into which the Mapping of this Ccdimage maps the pixel coordinates.

virtual std::shared_ptr<afw::geom::SkyWcs> makeSkyWcs(CcdImage const &ccdImage) const = 0

Make a SkyWcs that contains this model.

Return

SkyWcs containing this model.

Parameters

  • ccdImage: The exposure to create the SkyWcs for.

virtual void freezeErrorTransform() = 0
virtual std::size_t getTotalParameters() const = 0

Return the total number of parameters in this model.

virtual ~AstrometryModel()
bool validate(CcdImageList const &ccdImageList, int ndof) const

Return true if this is a “reasonable” model.

Return

True if the model is valid on all ccdImages.

Parameters

  • ccdImageList: The ccdImages to test the model validity on.

  • ndof: The number of degrees of freedom in the fit, e.g. from Fitterbase.computeChi2().

Protected Functions

virtual AstrometryMapping *findMapping(CcdImage const &ccdImage) const = 0

Return a pointer to the mapping associated with this ccdImage.

Protected Attributes

LOG_LOGGER _log

lsst.logging instance, to be created by a subclass so that messages have consistent name.