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LSST Data Management Base Package
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Abstract base class for all C++ measurement transformations. More...
#include <Transform.h>
Public Member Functions | |
BaseTransform (std::string const &name) | |
virtual | ~BaseTransform () |
virtual void | operator() (afw::table::SourceCatalog const &inputCatalog, afw::table::BaseCatalog &outputCatalog, afw::geom::SkyWcs const &wcs, afw::image::PhotoCalib const &photoCalib) const =0 |
Protected Member Functions | |
void | checkCatalogSize (afw::table::BaseCatalog const &cat1, afw::table::BaseCatalog const &cat2) const |
Ensure that catalogs have the same size. | |
Protected Attributes | |
std::string | _name |
Abstract base class for all C++ measurement transformations.
Measurement plugins return results in raw, uncalibrated units (eg fluxes or positions in pixels). The transformation system provides a mechanism for post-processing those results into a calibrated form (magnitudes, celestial coordinates, etc).
A measurement transformation should derive from BaseTransform. It should implement a constructor which takes three arguments:
Control
object describing the configuration of the measurement plugin.std::string
);lsst::afw::table::SchemaMapper
which links the input and output catalogs;The constructor should use the SchemaMapper to map fields from the input to output schemas and add additional keys to the output as required. For example:
Derived classes should also implement operator()
following the interface below. This will be called with a catalog containing the results of the measurement plugin and a catalog to be populated with transformed quantities, as well as WCS and calibration information. For example:
Note that it is safe to assume that both catalogs passed to operator()
are contiguous in memory. It is good practice to ensure that they are equal in size: this may be conveniently achieved by calling BaseTransform::checkCatalogSize()
.
operator()
may throw LengthError
if the transformation is impossible to complete. In this case, the contents of outputCatalog
is not guaranteed.
Definition at line 86 of file Transform.h.
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inlineexplicit |
Definition at line 88 of file Transform.h.
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inlinevirtual |
Definition at line 89 of file Transform.h.
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inlineprotected |
Ensure that catalogs have the same size.
[in] | cat1 | Catalog for comparison |
[in] | cat2 | Catalog for comparison |
LengthError | Catalog sizes do not match |
Definition at line 102 of file Transform.h.
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pure virtual |
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protected |
Definition at line 107 of file Transform.h.