lsst.meas.algorithms.sourceSelector.MagnitudeLimit Class Reference

Inheritance diagram for lsst.meas.algorithms.sourceSelector.MagnitudeLimit:

Public Member Functions
	apply (self, catalog)

Static Public Attributes
	fluxField

Detailed Description

Select sources using a magnitude limit

Note that this assumes that a zero-point has already been applied and
the fluxes are in AB fluxes in Jansky. It is therefore principally
intended for reference catalogs rather than catalogs extracted from
science images.

This object can be used as a `lsst.pex.config.Config` for configuring
the limit, and then the `apply` method can be used to identify sources
in the catalog that match the configured limit.

Definition at line 273 of file sourceSelector.py.

Member Function Documentation

apply()

lsst.meas.algorithms.sourceSelector.MagnitudeLimit.apply	(		self,
			catalog )

Apply the magnitude limits to a catalog

Parameters
----------
catalog : `lsst.afw.table.SourceCatalog`
    Catalog of sources to which the limit will be applied.

Returns
-------
selected : `numpy.ndarray`
    Boolean array indicating for each source whether it is selected
    (True means selected).

Reimplemented from lsst.meas.algorithms.sourceSelector.BaseLimit.

Definition at line 288 of file sourceSelector.py.

    def apply(self, catalog):
        """Apply the magnitude limits to a catalog
 
        Parameters
        ----------
        catalog : `lsst.afw.table.SourceCatalog`
            Catalog of sources to which the limit will be applied.
 
        Returns
        -------
        selected : `numpy.ndarray`
            Boolean array indicating for each source whether it is selected
            (True means selected).
        """
        flagField = self.fluxField + "_flag"
        selected = np.logical_not(_getFieldFromCatalog(catalog, flagField, isFlag=True))
        flux = _getFieldFromCatalog(catalog, self.fluxField)
 
        magnitude = (flux*u.nJy).to_value(u.ABmag)
        selected &= BaseLimit.apply(self, magnitude)
        return selected
 
 

Member Data Documentation

fluxField

lsst.meas.algorithms.sourceSelector.MagnitudeLimit.fluxField

static

Initial value:

=  pexConfig.Field(dtype=str, default="flux",
                                doc="Name of the source flux field to use.")

Definition at line 285 of file sourceSelector.py.

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

• /j/snowflake/release/lsstsw/stack/lsst-scipipe-8.0.0/Linux64/meas_algorithms/ge6526c86ff+508d0e0a30/python/lsst/meas/algorithms/sourceSelector.py