lsst::meas::base::CentroidTransform Class Reference

#include <CentroidUtilities.h>

Inheritance diagram for lsst::meas::base::CentroidTransform:

Public Member Functions
	CentroidTransform (std::string const &name, afw::table::SchemaMapper &mapper)
virtual void	operator() (afw::table::SourceCatalog const &inputCatalog, afw::table::BaseCatalog &outputCatalog, afw::image::Wcs const &wcs, afw::image::Calib const &calib) const
Public Member Functions inherited from lsst::meas::base::BaseTransform
	BaseTransform (std::string const &name)
virtual	~BaseTransform ()

Private Attributes
afw::table::CoordKey	_coordKey
afw::table::CovarianceMatrixKey < ErrElement, 2 >	_coordErrKey

Additional Inherited Members
Protected Member Functions inherited from lsst::meas::base::BaseTransform
void	checkCatalogSize (afw::table::BaseCatalog const &cat1, afw::table::BaseCatalog const &cat2) const
	Ensure that catalogs have the same size. More...
Protected Attributes inherited from lsst::meas::base::BaseTransform
std::string	_name

Detailed Description

Base for centroid measurement transformations.

Provides a basic transform from centroid plus associated uncertainty to celestial position with uncertainty. The basic "flag" attribute for the measurement algorithm is propagated to the output.

Subclasses should define a constructor which take a Control argument corresponding to the measurement algorithm being transformed and ensure that any other necessary flags are propagated.

Definition at line 182 of file CentroidUtilities.h.

Constructor & Destructor Documentation

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

Definition at line 133 of file CentroidUtilities.cc.

  :
    BaseTransform{name}
{
    // Map the flag through to the output
    mapper.addMapping(mapper.getInputSchema().find<afw::table::Flag>(name + "_flag").key);

    // Add keys for the coordinates
    auto & s = mapper.editOutputSchema();
    _coordKey = afw::table::CoordKey::addFields(s, name, "ICRS coordinates");

    // If the centroid has an error key we also include one on the celestial
    // coordinates; otherwise, it isn't necessary. Note that if we provide for
    // errors in celestial coordinates, we always need the full covariance.
    if (CentroidResultKey(mapper.getInputSchema()[name]).getCentroidErr().isValid()) {
        std::vector< afw::table::Key<ErrElement> > sigma(2);
        std::vector< afw::table::Key<ErrElement> > cov(1);
        sigma[0] = s.addField<ErrElement>(s.join(name, "raSigma"), "Uncertainty on RA", "radians");
        sigma[1] = s.addField<ErrElement>(s.join(name, "decSigma"), "Uncertainty on dec", "radians");
        cov[0] = s.addField<ErrElement>(s.join(name, "ra_dec_Cov"),
                                             "Uncertainty covariance in RA and dec", "radians^2");
        _coordErrKey = afw::table::CovarianceMatrixKey<ErrElement,2>(sigma, cov);
    }

}

Member Function Documentation

void lsst::meas::base::CentroidTransform::operator() ( afw::table::SourceCatalog const &  inputCatalog, afw::table::BaseCatalog &  outputCatalog, afw::image::Wcs const &  wcs, afw::image::Calib const &  calib  ) const

virtual

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

Definition at line 161 of file CentroidUtilities.cc.

        {
    checkCatalogSize(inputCatalog, outputCatalog);
    CentroidResultKey centroidResultKey(inputCatalog.getSchema()[_name]);

    afw::table::SourceCatalog::const_iterator inSrc = inputCatalog.begin();
    afw::table::BaseCatalog::iterator outSrc = outputCatalog.begin();

    for (; inSrc != inputCatalog.end() && outSrc != outputCatalog.end(); ++inSrc, ++outSrc) {
        CentroidResult centroidResult = centroidResultKey.get(*inSrc);

        _coordKey.set(*outSrc, *wcs.pixelToSky(centroidResult.getCentroid()));

        if (centroidResultKey.getCentroidErr().isValid()) {
            CentroidCov centroidCov = centroidResult.getCentroidErr();
            if (!(utils::isnan(centroidCov(0,0)) || utils::isnan(centroidCov(1,1)))) {
                auto transform = wcs.linearizePixelToSky(centroidResult.getCentroid(),
                                                         afw::geom::radians).getLinear().getMatrix();
                _coordErrKey.set(*outSrc, (transform * centroidResult.getCentroidErr().cast<double>() *
                                           transform.transpose()).cast<ErrElement>());
            }
        }
    }
}

Member Data Documentation

afw::table::CovarianceMatrixKey<ErrElement,2> lsst::meas::base::CentroidTransform::_coordErrKey

private

Definition at line 201 of file CentroidUtilities.h.

afw::table::CoordKey lsst::meas::base::CentroidTransform::_coordKey

private

Definition at line 200 of file CentroidUtilities.h.

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

• /home/lsstsw/stack/Linux64/meas_base/11.0+1/include/lsst/meas/base/CentroidUtilities.h
• /home/lsstsw/stack/Linux64/meas_base/11.0+1/src/CentroidUtilities.cc