lsst.meas.base.plugins.ForcedTransformedShapePlugin Class Reference

Inheritance diagram for lsst.meas.base.plugins.ForcedTransformedShapePlugin:

Public Member Functions
def	getExecutionOrder
def	__init__
def	measure

Public Attributes
	shapeKey
	flagKey

Static Public Attributes
	ConfigClass = ForcedTransformedShapeConfig

Detailed Description

A shape pseudo-algorithm for forced measurement that simply transforms the shape
from the reference catalog to the measurement coordinate system.  This is used as
the slot shape by default in forced measurement, allowing subsequent measurements
to simply refer to the slot value just as they would in single-frame measurement.

Definition at line 289 of file plugins.py.

Constructor & Destructor Documentation

def lsst.meas.base.plugins.ForcedTransformedShapePlugin.__init__	(		self,
			config,
			name,
			schemaMapper,
			metadata
	)

Definition at line 302 of file plugins.py.

    def __init__(self, config, name, schemaMapper, metadata):
        ForcedPlugin.__init__(self, config, name, schemaMapper, metadata)
        schema = schemaMapper.editOutputSchema()
        # Allocate xx, yy, xy fields, join these into a single FunctorKey for ease-of-use.
        xxKey = schema.addField(name + "_xx", type="D", doc="transformed reference shape x^2 moment",
                                units="pixels^2")
        yyKey = schema.addField(name + "_yy", type="D", doc="transformed reference shape y^2 moment",
                                units="pixels^2")
        xyKey = schema.addField(name + "_xy", type="D", doc="transformed reference shape xy moment",
                                units="pixels^2")
        self.shapeKey = lsst.afw.table.QuadrupoleKey(xxKey, yyKey, xyKey)
        # Because we're taking the reference position as given, we don't bother transforming its
        # uncertainty and reporting that here, so there are no sigma or cov fields.  We do propagate
        # the flag field, if it exists.
        if "slot_Shape_flag" in schemaMapper.getInputSchema():
            self.flagKey = schema.addField(name + "_flag", type="Flag",
                                           doc="whether the reference shape is marked as bad")
        else:
            self.flagKey = None