EvaluateLocalWcsPlugin¶
-
class
lsst.meas.base.
EvaluateLocalWcsPlugin
(config, name, schema, metadata)¶ Bases:
lsst.meas.base.GenericPlugin
Evaluate the local, linear approximation of the Wcs.
The aim is to store the local calib value within the catalog for later use in the Science Data Model functors.
Attributes Summary
APCORR_ORDER
CENTROID_ORDER
DEFAULT_CATALOGCALCULATION
FLUX_ORDER
SHAPE_ORDER
Methods Summary
fail
(measRecord[, error])Record a measurement failure. getExecutionOrder
()Get the relative execution order of this plugin. getLogName
()getTransformClass
()Get the measurement transformation appropriate to this plugin. makeForcedPlugin
(name)Produce a ForcedPlugin subclass from this GenericPlugin class. makeLocalTransformMatrix
(wcs, center)Create a local, linear approximation of the wcs transformation matrix. makeSingleFramePlugin
(name)Produce a SingleFramePlugin subclass from this GenericPlugin class. measure
(measRecord, exposure, center)Measure a single source. measureN
(measCat, exposure, refCat, refWcs)Measure multiple sources. Attributes Documentation
-
APCORR_ORDER
= 3.0¶
-
CENTROID_ORDER
= 0.0¶
-
DEFAULT_CATALOGCALCULATION
= 4.0¶
-
FLUX_ORDER
= 2.0¶
-
SHAPE_ORDER
= 1.0¶
Methods Documentation
-
fail
(measRecord, error=None)¶ Record a measurement failure.
This default implementation simply records the failure in the source record.
Parameters: - measRecord :
lsst.afw.table.SourceRecord
Catalog record for the source being measured.
- error :
Exception
Error causing failure, or
None
.
- measRecord :
-
classmethod
getExecutionOrder
()¶ Get the relative execution order of this plugin.
Must be reimplemented as a class method by concrete derived classes.
-
getLogName
()¶
-
static
getTransformClass
()¶ Get the measurement transformation appropriate to this plugin.
This returns a subclass of
transforms.MeasurementTransform
, which may be instantiated with details of the algorithm configuration and then called with information about calibration and WCS to convert from raw measurement quantities to calibrated units. Calibrated data is then provided in a separate output table.Notes
By default, we copy everything from the input to the output without transformation.
-
classmethod
makeForcedPlugin
(name)¶ Produce a ForcedPlugin subclass from this GenericPlugin class.
The class is also registered.
Parameters: - name :
str
Name of plugin to register.
- name :
-
makeLocalTransformMatrix
(wcs, center)¶ Create a local, linear approximation of the wcs transformation matrix.
The approximation is created as if the center is at RA=0, DEC=0. All comparing x,y coordinate are relative to the position of center. Matrix is initially calculated with units arcseconds and then converted to radians. This yields higher precision results due to quirks in AST.
Parameters: - wcs :
lsst.afw.geom.SkyWcs
Wcs to approximate
- center :
lsst.geom.Point2D
Point at which to evaluate the LocalWcs.
Returns: - localMatrix :
numpy.ndarray
Matrix representation the local wcs approximation with units radians.
- wcs :
-
classmethod
makeSingleFramePlugin
(name)¶ Produce a SingleFramePlugin subclass from this GenericPlugin class.
The class is also registered.
Parameters: - name :
str
Name of plugin to register.
- name :
-
measure
(measRecord, exposure, center)¶ Measure a single source.
It is the responsibility of this method to perform the desired measurement and record the result in the
measRecord
.Parameters: - measRecord :
lsst.afw.table.SourceRecord
Catalog record for the source being measured.
- exposure :
lsst.afw.image.Exposure
Exposure on which the source is being measured.
- center :
lsst.geom.Point2D
Pixel coordinates of the object.
Raises: - MeasurementError
Raised if the measurement fails for a known/justifiable reason.
- measRecord :
-
measureN
(measCat, exposure, refCat, refWcs)¶ Measure multiple sources.
It is the responsibility of this method to perform the desired measurement and record the result in the
measCat
.Parameters: - measCat :
lsst.afw.table.SourceCatalog
Catalog for the sources being measured.
- exposure :
lsst.afw.image.Exposure
Exposure on which the source is being measured.
- refCat :
lsst.afw.table.SourceCatalog
Reference catalog.
- refWcs :
lsst.afw.image.Wcs
Astrometric solution for the reference image.
Raises: - MeasurementError
Raised if the measurement fails for a known/justifiable reason.
- measCat :
-