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ScaledApertureFlux.cc
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1// -*- lsst-c++ -*-
2/*
3 * LSST Data Management System
4 * Copyright 2008-2016 AURA/LSST.
5 *
6 * This product includes software developed by the
7 * LSST Project (http://www.lsst.org/).
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23
29
30namespace lsst {
31namespace meas {
32namespace base {
33
35 afw::table::Schema& schema)
36 : _ctrl(ctrl),
37 _instFluxResultKey(
38 FluxResultKey::addFields(schema, name, "instFlux derived from PSF-scaled aperture")),
39 _centroidExtractor(schema, name) {
41}
42
44 afw::image::Exposure<float> const& exposure) const {
45 geom::Point2D const center = _centroidExtractor(measRecord, _flagHandler);
46 double const radius = exposure.getPsf()->computeShape(center).getDeterminantRadius();
47 double const fwhm = 2.0 * std::sqrt(2.0 * std::log(2)) * radius;
48 double const size = _ctrl.scale * fwhm;
49 afw::geom::ellipses::Axes const axes(size, size);
50
51 // ApertureFluxAlgorithm::computeSincFlux requires an ApertureFluxControl as an
52 // argument. All that it uses it for is to read the type of warping kernel.
54 apCtrl.shiftKernel = _ctrl.shiftKernel;
55
57 exposure.getMaskedImage(), afw::geom::ellipses::Ellipse(axes, center), apCtrl);
58 measRecord.set(_instFluxResultKey, result);
59
62 if (result.getFlag(iter.number)) {
63 _flagHandler.setValue(measRecord, iter.number, true);
64 }
65 }
66}
67
69 _flagHandler.handleFailure(measRecord, error);
70}
71
74 : FluxTransform{name, mapper} {
78 mapper.getInputSchema().find<afw::table::Flag>(name + "_" + flagName).key;
79 if (key.isValid()) {
80 mapper.addMapping(key);
81 }
82 }
83}
84
85} // namespace base
86} // namespace meas
87} // namespace lsst
SchemaMapper * mapper
An ellipse core for the semimajor/semiminor axis and position angle parametrization (a,...
Definition Axes.h:47
An ellipse defined by an arbitrary BaseCore and a center point.
Definition Ellipse.h:51
A class to contain the data, WCS, and other information needed to describe an image of the sky.
Definition Exposure.h:72
void set(Key< T > const &key, U const &value)
Set value of a field for the given key.
Definition BaseRecord.h:164
A class used as a handle to a particular field in a table.
Definition KeyBase.h:16
bool isValid() const noexcept
Return true if the key was initialized to valid offset.
Definition Key.h:97
Defines the fields and offsets for a table.
Definition Schema.h:51
A mapping between the keys of two Schemas, used to copy data between them.
Record class that contains measurements made on a single exposure.
Definition Source.h:78
static FlagDefinitionList const & getFlagDefinitions()
static Result computeSincFlux(afw::image::Image< T > const &image, afw::geom::ellipses::Ellipse const &ellipse, Control const &ctrl=Control())
Compute the instFlux (and optionally, uncertanties) within an aperture using Sinc photometry.
Configuration object for multiple-aperture flux algorithms.
std::string shiftKernel
"Warping kernel used to shift Sinc photometry coefficients to different center positions" ;
std::size_t size() const
return the current size (number of defined elements) of the collection
void handleFailure(afw::table::BaseRecord &record, MeasurementError const *error=nullptr) const
Handle an expected or unexpected Exception thrown by a measurement algorithm.
static FlagHandler addFields(afw::table::Schema &schema, std::string const &prefix, FlagDefinitionList const &flagDefs, FlagDefinitionList const &exclDefs=FlagDefinitionList::getEmptyList())
Add Flag fields to a schema, creating a FlagHandler object to manage them.
void setValue(afw::table::BaseRecord &record, std::size_t i, bool value) const
Set the flag field corresponding to the given flag index.
A FunctorKey for FluxResult.
Base for instFlux measurement transformations.
Exception to be thrown when a measurement algorithm experiences a known failure mode.
Definition exceptions.h:48
ScaledApertureFluxAlgorithm(Control const &control, std::string const &name, afw::table::Schema &schema)
virtual void measure(afw::table::SourceRecord &measRecord, afw::image::Exposure< float > const &exposure) const override
Measure the scaled aperture instFlux on the given image.
virtual void fail(afw::table::SourceRecord &measRecord, MeasurementError *error=nullptr) const override
Handle an exception thrown by the current algorithm by setting flags in the given record.
std::string shiftKernel
"Warping kernel used to shift Sinc photometry coefficients to different center positions" ;
double scale
"Scaling factor of PSF FWHM for aperture radius." ;
ScaledApertureFluxTransform(Control const &ctrl, std::string const &name, afw::table::SchemaMapper &mapper)
T log(T... args)
T sqrt(T... args)
A Result struct for running an aperture flux algorithm with a single radius.
Simple class used to define and document flags The name and doc constitute the identity of the FlagDe...
Definition FlagHandler.h:40