lsst.meas.algorithms  21.0.0-13-gc485e61d+e008681cf5
Public Member Functions | Static Public Member Functions | Public Attributes | Static Public Attributes | List of all members
lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask Class Reference
Inheritance diagram for lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask:
lsst.meas.algorithms.loadIndexedReferenceObjects.LoadIndexedReferenceObjectsTask

Public Member Functions

def __init__ (self, butler=None, *args, **kwargs)
 
def loadPixelBox (self, bbox, wcs, filterName=None, photoCalib=None, epoch=None)
 
def loadSkyCircle (self, ctrCoord, radius, filterName=None, epoch=None, centroids=False)
 
def getMetadataBox (self, bbox, wcs, filterName=None, photoCalib=None, epoch=None)
 
def getMetadataCircle (self, coord, radius, filterName, photoCalib=None, epoch=None)
 
def joinMatchListWithCatalog (self, matchCat, sourceCat)
 
def applyProperMotions (self, catalog, epoch)
 

Static Public Member Functions

def makeMinimalSchema (filterNameList, *addCentroid=False, addIsPhotometric=False, addIsResolved=False, addIsVariable=False, coordErrDim=2, addProperMotion=False, properMotionErrDim=2, addParallax=False)
 

Public Attributes

 butler
 

Static Public Attributes

 ConfigClass = LoadReferenceObjectsConfig
 

Detailed Description

Abstract base class to load objects from reference catalogs

Definition at line 818 of file loadReferenceObjects.py.

Constructor & Destructor Documentation

◆ __init__()

def lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask.__init__ (   self,
  butler = None,
args,
**  kwargs 
)
Construct a LoadReferenceObjectsTask

Parameters
----------
butler : `lsst.daf.persistence.Butler`
    Data butler, for access reference catalogs.

Reimplemented in lsst.meas.algorithms.loadIndexedReferenceObjects.LoadIndexedReferenceObjectsTask.

Definition at line 824 of file loadReferenceObjects.py.

Member Function Documentation

◆ applyProperMotions()

def lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask.applyProperMotions (   self,
  catalog,
  epoch 
)
Apply proper motion correction to a reference catalog.

Adjust position and position error in the ``catalog``
for proper motion to the specified ``epoch``,
modifying the catalog in place.

Parameters
----------
catalog : `lsst.afw.table.SimpleCatalog`
    Catalog of positions, containing:

    - Coordinates, retrieved by the table's coordinate key.
    - ``coord_raErr`` : Error in Right Ascension (rad).
    - ``coord_decErr`` : Error in Declination (rad).
    - ``pm_ra`` : Proper motion in Right Ascension (rad/yr,
        East positive)
    - ``pm_raErr`` : Error in ``pm_ra`` (rad/yr), optional.
    - ``pm_dec`` : Proper motion in Declination (rad/yr,
        North positive)
    - ``pm_decErr`` : Error in ``pm_dec`` (rad/yr), optional.
    - ``epoch`` : Mean epoch of object (an astropy.time.Time)
epoch : `astropy.time.Time`
    Epoch to which to correct proper motion,

Definition at line 1311 of file loadReferenceObjects.py.

◆ getMetadataBox()

def lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask.getMetadataBox (   self,
  bbox,
  wcs,
  filterName = None,
  photoCalib = None,
  epoch = None 
)
Return metadata about the load.

This metadata is used for reloading the catalog (e.g., for
reconstituting a normalised match list.

Parameters
----------
bbox : `lsst.geom.Box2I` or `lsst.geom.Box2D`
    Pixel bounding box.
wcs : `lsst.afw.geom.SkyWcs`
    WCS; used to convert pixel positions to sky coordinates.
filterName : `str`
    Name of camera filter, or `None` or `""` for the default
    filter.
photoCalib : `lsst.afw.image.PhotoCalib` (optional)
    Calibration, or `None` if unknown.
epoch : `astropy.time.Time` (optional)
    Epoch to which to correct proper motion and parallax,
    or None to not apply such corrections.

Returns
-------
metadata : lsst.daf.base.PropertyList
    Metadata about the load.

Definition at line 1218 of file loadReferenceObjects.py.

◆ getMetadataCircle()

def lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask.getMetadataCircle (   self,
  coord,
  radius,
  filterName,
  photoCalib = None,
  epoch = None 
)
Return metadata about the load.

This metadata is used for reloading the catalog (e.g., for
reconstituting a normalised match list.

Parameters
----------
coord : `lsst.geom.SpherePoint`
    ICRS center of the search region.
radius : `lsst.geom.Angle`
    Radius of the search region.
filterName : `str`
    Name of camera filter, or `None` or `""` for the default
    filter.
photoCalib : `lsst.afw.image.PhotoCalib` (optional)
    Calibration, or `None` if unknown.
epoch : `astropy.time.Time` (optional)
    Epoch to which to correct proper motion and parallax,
    or None to not apply such corrections.

Returns
-------
metadata : lsst.daf.base.PropertyList
    Metadata about the load

Definition at line 1248 of file loadReferenceObjects.py.

◆ joinMatchListWithCatalog()

def lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask.joinMatchListWithCatalog (   self,
  matchCat,
  sourceCat 
)
Relink an unpersisted match list to sources and reference
objects.

A match list is persisted and unpersisted as a catalog of IDs
produced by afw.table.packMatches(), with match metadata
(as returned by the astrometry tasks) in the catalog's metadata
attribute. This method converts such a match catalog into a match
list, with links to source records and reference object records.

Parameters
----------
matchCat : `lsst.afw.table.BaseCatalog`
    Unperisted packed match list.
    ``matchCat.table.getMetadata()`` must contain match metadata,
    as returned by the astrometry tasks.
sourceCat : `lsst.afw.table.SourceCatalog`
    Source catalog. As a side effect, the catalog will be sorted
    by ID.

Returns
-------
matchList : `lsst.afw.table.ReferenceMatchVector`
    Match list.

Definition at line 1284 of file loadReferenceObjects.py.

◆ loadPixelBox()

def lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask.loadPixelBox (   self,
  bbox,
  wcs,
  filterName = None,
  photoCalib = None,
  epoch = None 
)
Load reference objects that overlap a rectangular pixel region.

Parameters
----------
bbox : `lsst.geom.Box2I` or `lsst.geom.Box2D`
    Bounding box for pixels.
wcs : `lsst.afw.geom.SkyWcs`
    WCS; used to convert pixel positions to sky coordinates
    and vice-versa.
filterName : `str`
    Name of filter, or `None` or `""` for the default filter.
    This is used for flux values in case we have flux limits
    (which are not yet implemented).
photoCalib : `lsst.afw.image.PhotoCalib` (optional)
    Calibration, or `None` if unknown.
epoch : `astropy.time.Time` (optional)
    Epoch to which to correct proper motion and parallax,
    or None to not apply such corrections.

Returns
-------
results : `lsst.pipe.base.Struct`
    A Struct containing the following fields:
    refCat : `lsst.afw.catalog.SimpleCatalog`
        A catalog of reference objects with the standard
        schema, as documented in the main doc string for
        `LoadReferenceObjects`.
        The catalog is guaranteed to be contiguous.
    fluxField : `str`
        Name of flux field for specified `filterName`.

Notes
-----
The search algorithm works by searching in a region in sky
coordinates whose center is the center of the bbox and radius
is large enough to just include all 4 corners of the bbox.
Stars that lie outside the bbox are then trimmed from the list.

Definition at line 836 of file loadReferenceObjects.py.

◆ loadSkyCircle()

def lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask.loadSkyCircle (   self,
  ctrCoord,
  radius,
  filterName = None,
  epoch = None,
  centroids = False 
)
Load reference objects that overlap a circular sky region.

Parameters
----------
ctrCoord : `lsst.geom.SpherePoint`
    ICRS center of search region.
radius : `lsst.geom.Angle`
    Radius of search region.
filterName : `str` (optional)
    Name of filter, or `None` or `""` for the default filter.
    This is used for flux values in case we have flux limits
    (which are not yet implemented).
epoch : `astropy.time.Time` (optional)
    Epoch to which to correct proper motion and parallax,
    or None to not apply such corrections.
centroids : `bool` (optional)
    Add centroid fields to the loaded Schema. ``loadPixelBox`` expects
    these fields to exist.

Returns
-------
results : `lsst.pipe.base.Struct`
    A Struct containing the following fields:
    refCat : `lsst.afw.catalog.SimpleCatalog`
        A catalog of reference objects with the standard
        schema, as documented in the main doc string for
        `LoadReferenceObjects`.
        The catalog is guaranteed to be contiguous.
    fluxField : `str`
        Name of flux field for specified `filterName`.

Notes
-----
Note that subclasses are responsible for performing the proper motion
correction, since this is the lowest-level interface for retrieving
the catalog.

Reimplemented in lsst.meas.algorithms.loadIndexedReferenceObjects.LoadIndexedReferenceObjectsTask.

Definition at line 898 of file loadReferenceObjects.py.

◆ makeMinimalSchema()

def lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask.makeMinimalSchema (   filterNameList,
addCentroid = False,
  addIsPhotometric = False,
  addIsResolved = False,
  addIsVariable = False,
  coordErrDim = 2,
  addProperMotion = False,
  properMotionErrDim = 2,
  addParallax = False 
)
static
Make a standard schema for reference object catalogs.

Parameters
----------
filterNameList : `list` of `str`
    List of filter names. Used to create <filterName>_flux fields.
addIsPhotometric : `bool`
    If True then add field "photometric".
addIsResolved : `bool`
    If True then add field "resolved".
addIsVariable : `bool`
    If True then add field "variable".
coordErrDim : `int`
    Number of coord error fields; must be one of 0, 2, 3:

    - If 2 or 3: add fields "coord_raErr" and "coord_decErr".
    - If 3: also add field "coord_radecErr".
addProperMotion : `bool`
    If True add fields "epoch", "pm_ra", "pm_dec" and "pm_flag".
properMotionErrDim : `int`
    Number of proper motion error fields; must be one of 0, 2, 3;
    ignored if addProperMotion false:
    - If 2 or 3: add fields "pm_raErr" and "pm_decErr".
    - If 3: also add field "pm_radecErr".
addParallax : `bool`
    If True add fields "epoch", "parallax", "parallaxErr"
    and "parallax_flag".

Returns
-------
schema : `lsst.afw.table.Schema`
    Schema for reference catalog, an
    `lsst.afw.table.SimpleCatalog`.

Notes
-----
Reference catalogs support additional covariances, such as
covariance between RA and proper motion in declination,
that are not supported by this method, but can be added after
calling this method.

Definition at line 1031 of file loadReferenceObjects.py.

Member Data Documentation

◆ butler

lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask.butler

Definition at line 833 of file loadReferenceObjects.py.

◆ ConfigClass

lsst.meas.algorithms.loadReferenceObjects.LoadReferenceObjectsTask.ConfigClass = LoadReferenceObjectsConfig
static

Definition at line 821 of file loadReferenceObjects.py.


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