lsst::meas::base::SdssShapeTransform Class Reference

Transformation for SdssShape measurements. More...

#include <SdssShape.h>

Inheritance diagram for lsst::meas::base::SdssShapeTransform:

Public Types
typedef SdssShapeControl	Control

Public Member Functions
	SdssShapeTransform (Control const &ctrl, std::string const &name, afw::table::SchemaMapper &mapper)
virtual void	operator() (afw::table::SourceCatalog const &inputCatalog, afw::table::BaseCatalog &outputCatalog, afw::geom::SkyWcs const &wcs, afw::image::PhotoCalib const &photoCalib) const

Protected Member Functions
void	checkCatalogSize (afw::table::BaseCatalog const &cat1, afw::table::BaseCatalog const &cat2) const
	Ensure that catalogs have the same size. More...

Protected Attributes
std::string	_name

Detailed Description

Transformation for SdssShape measurements.

SdssShape measures not just shape but also instFlux and centroid. This transform operates on the first directly, and delegates to the Flux and Centroid transforms for the other two.

Definition at line 250 of file SdssShape.h.

Member Typedef Documentation

Control

typedef SdssShapeControl lsst::meas::base::SdssShapeTransform::Control

Definition at line 252 of file SdssShape.h.

Constructor & Destructor Documentation

SdssShapeTransform()

lsst::meas::base::SdssShapeTransform::SdssShapeTransform	(	Control const &	ctrl,
		std::string const &	name,
		afw::table::SchemaMapper &	mapper
	)

Definition at line 922 of file SdssShape.cc.

        : BaseTransform{name}, _instFluxTransform{name, mapper}, _centroidTransform{name, mapper} {
    // If the input schema has a PSF flag -- it's optional --  assume we are also transforming the PSF.
    _transformPsf = mapper.getInputSchema().getNames().count("sdssShape_flag_psf") ? true : false;
 
    // Skip the last flag if not transforming the PSF shape.
    for (std::size_t i = 0; i < SdssShapeAlgorithm::getFlagDefinitions().size(); i++) {
        FlagDefinition const &flag = SdssShapeAlgorithm::getFlagDefinitions()[i];
        if (flag == SdssShapeAlgorithm::FAILURE) continue;
        if (mapper.getInputSchema().getNames().count(mapper.getInputSchema().join(name, flag.name)) == 0)
            continue;
        afw::table::Key<afw::table::Flag> key =
                mapper.getInputSchema().find<afw::table::Flag>(name + "_" + flag.name).key;
        mapper.addMapping(key);
    }
 
    _outShapeKey = ShapeResultKey::addFields(mapper.editOutputSchema(), name, "Shape in celestial moments",
                                             FULL_COVARIANCE, afw::table::CoordinateType::CELESTIAL);
    if (_transformPsf) {
        _outPsfShapeKey = afw::table::QuadrupoleKey::addFields(mapper.editOutputSchema(), name + "_psf",
                                                               "PSF shape in celestial moments",
                                                               afw::table::CoordinateType::CELESTIAL);
    }
}

Member Function Documentation

checkCatalogSize()

void lsst::meas::base::BaseTransform::checkCatalogSize ( afw::table::BaseCatalog const &  cat1, afw::table::BaseCatalog const &  cat2  ) const

inlineprotectedinherited

Ensure that catalogs have the same size.

Parameters

[in]	cat1	Catalog for comparison
[in]	cat2	Catalog for comparison

Exceptions

LengthError

Catalog sizes do not match

Definition at line 102 of file Transform.h.

                                                                                                  {
        if (cat1.size() != cat2.size()) {
            throw LSST_EXCEPT(pex::exceptions::LengthError, "Catalog size mismatch");
        }
    }

operator()()

void lsst::meas::base::SdssShapeTransform::operator() ( afw::table::SourceCatalog const &  inputCatalog, afw::table::BaseCatalog &  outputCatalog, afw::geom::SkyWcs const &  wcs, afw::image::PhotoCalib const &  photoCalib  ) const

virtual

Implements lsst::meas::base::BaseTransform.

Definition at line 948 of file SdssShape.cc.

                                                                                {
    // The instFlux and cetroid transforms will check that the catalog lengths
    // match and throw if not, so we don't repeat the test here.
    _instFluxTransform(inputCatalog, outputCatalog, wcs, photoCalib);
    _centroidTransform(inputCatalog, outputCatalog, wcs, photoCalib);
 
    CentroidResultKey centroidKey(inputCatalog.getSchema()[_name]);
    ShapeResultKey inShapeKey(inputCatalog.getSchema()[_name]);
    afw::table::QuadrupoleKey inPsfShapeKey;
    if (_transformPsf) {
        inPsfShapeKey = afw::table::QuadrupoleKey(
                inputCatalog.getSchema()[inputCatalog.getSchema().join(_name, "psf")]);
    }
 
    afw::table::SourceCatalog::const_iterator inSrc = inputCatalog.begin();
    afw::table::BaseCatalog::iterator outSrc = outputCatalog.begin();
    for (; inSrc != inputCatalog.end(); ++inSrc, ++outSrc) {
        ShapeResult inShape = inShapeKey.get(*inSrc);
        ShapeResult outShape;
 
        // The transformation from the (x, y) to the (Ra, Dec) basis.
        geom::AffineTransform crdTr =
                wcs.linearizePixelToSky(centroidKey.get(*inSrc).getCentroid(), geom::radians);
        outShape.setShape(inShape.getShape().transform(crdTr.getLinear()));
 
        // Transformation matrix from pixel to celestial basis.
        ShapeTrMatrix m = makeShapeTransformMatrix(crdTr.getLinear());
        outShape.setShapeErr((m * inShape.getShapeErr().cast<double>() * m.transpose()).cast<ErrElement>());
 
        _outShapeKey.set(*outSrc, outShape);
 
        if (_transformPsf) {
            _outPsfShapeKey.set(*outSrc, inPsfShapeKey.get(*inSrc).transform(crdTr.getLinear()));
        }
    }
}

Member Data Documentation

_name

std::string lsst::meas::base::BaseTransform::_name

protectedinherited

Definition at line 107 of file Transform.h.

---

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

• /j/snowflake/release/lsstsw/stack/cb4e2dc/Linux64/meas_base/20.0.0-4-gb4befbc+087873070b/include/lsst/meas/base/SdssShape.h
• /j/snowflake/release/lsstsw/stack/cb4e2dc/Linux64/meas_base/20.0.0-4-gb4befbc+087873070b/src/SdssShape.cc