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lsst.meas.astrom g374be3e903+3c89c0e672
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Public Member Functions | |
| __init__ (self, refObjLoader, schema=None, **kwargs) | |
| run (self, sourceCat, exposure) | |
| solve (self, exposure, sourceCat) | |
Public Attributes | |
| usedKey | |
Static Public Attributes | |
| ConfigClass = AstrometryConfig | |
Protected Member Functions | |
| _matchAndFitWcs (self, refCat, sourceCat, goodSourceCat, refFluxField, bbox, wcs, match_tolerance, exposure=None) | |
| _removeMagnitudeOutliers (self, sourceFluxField, refFluxField, matchesIn) | |
Static Protected Attributes | |
| str | _DefaultName = "astrometricSolver" |
Match an input source catalog with objects from a reference catalog and
solve for the WCS.
This task is broken into two main subasks: matching and WCS fitting which
are very interactive. The matching here can be considered in part a first
pass WCS fitter due to the fitter's sensitivity to outliers.
Parameters
----------
refObjLoader : `lsst.meas.algorithms.ReferenceLoader`
A reference object loader object
schema : `lsst.afw.table.Schema`
Used to set "calib_astrometry_used" flag in output source catalog.
**kwargs
additional keyword arguments for pipe_base
`lsst.pipe.base.Task.__init__`
Definition at line 100 of file astrometry.py.
| lsst.meas.astrom.astrometry.AstrometryTask.__init__ | ( | self, | |
| refObjLoader, | |||
schema = None, |
|||
| ** | kwargs | ||
| ) |
Reimplemented from lsst.meas.astrom.ref_match.RefMatchTask.
Definition at line 121 of file astrometry.py.
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protected |
Match sources to reference objects and fit a WCS.
Parameters
----------
refCat : `lsst.afw.table.SimpleCatalog`
catalog of reference objects
sourceCat : `lsst.afw.table.SourceCatalog`
catalog of sources detected on the exposure
goodSourceCat : `lsst.afw.table.SourceCatalog`
catalog of down-selected good sources detected on the exposure
refFluxField : 'str'
field of refCat to use for flux
bbox : `lsst.geom.Box2I`
bounding box of exposure
wcs : `lsst.afw.geom.SkyWcs`
initial guess for WCS of exposure
match_tolerance : `lsst.meas.astrom.MatchTolerance`
a MatchTolerance object (or None) specifying
internal tolerances to the matcher. See the MatchTolerance
definition in the respective matcher for the class definition.
exposure : `lsst.afw.image.Exposure`
exposure whose WCS is to be fit, or None; used only for the debug
display.
Returns
-------
result : `lsst.pipe.base.Struct`
Result struct with components:
- ``matches``: astrometric matches
(`list` of `lsst.afw.table.ReferenceMatch`).
- ``wcs``: the fit WCS (lsst.afw.geom.SkyWcs).
- ``scatterOnSky`` : median on-sky separation between reference
objects and sources in "matches" (`lsst.afw.geom.Angle`).
Definition at line 343 of file astrometry.py.
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protected |
Remove magnitude outliers, computing a simple zeropoint.
Parameters
----------
sourceFluxField : `str`
Field in source catalog for instrumental fluxes.
refFluxField : `str`
Field in reference catalog for fluxes (nJy).
matchesIn : `list` [`lsst.afw.table.ReferenceMatch`]
List of source/reference matches input
Returns
-------
matchesOut : `list` [`lsst.afw.table.ReferenceMatch`]
List of source/reference matches with magnitude
outliers removed.
Definition at line 441 of file astrometry.py.
| lsst.meas.astrom.astrometry.AstrometryTask.run | ( | self, | |
| sourceCat, | |||
| exposure | |||
| ) |
Load reference objects, match sources and optionally fit a WCS.
This is a thin layer around solve or loadAndMatch, depending on
config.forceKnownWcs.
Parameters
----------
exposure : `lsst.afw.image.Exposure`
exposure whose WCS is to be fit
The following are read only:
- bbox
- filter (may be unset)
- detector (if wcs is pure tangent; may be absent)
The following are updated:
- wcs (the initial value is used as an initial guess, and is
required)
sourceCat : `lsst.afw.table.SourceCatalog`
catalog of sources detected on the exposure
Returns
-------
result : `lsst.pipe.base.Struct`
with these fields:
- ``refCat`` : reference object catalog of objects that overlap the
exposure (with some margin) (`lsst.afw.table.SimpleCatalog`).
- ``matches`` : astrometric matches
(`list` of `lsst.afw.table.ReferenceMatch`).
- ``scatterOnSky`` : median on-sky separation between reference
objects and sources in "matches"
(`lsst.afw.geom.Angle`) or `None` if config.forceKnownWcs True
- ``matchMeta`` : metadata needed to unpersist matches
(`lsst.daf.base.PropertyList`)
Definition at line 133 of file astrometry.py.
| lsst.meas.astrom.astrometry.AstrometryTask.solve | ( | self, | |
| exposure, | |||
| sourceCat | |||
| ) |
Load reference objects overlapping an exposure, match to sources and
fit a WCS
Returns
-------
result : `lsst.pipe.base.Struct`
Result struct with components:
- ``refCat`` : reference object catalog of objects that overlap the
exposure (with some margin) (`lsst::afw::table::SimpleCatalog`).
- ``matches`` : astrometric matches
(`list` of `lsst.afw.table.ReferenceMatch`).
- ``scatterOnSky`` : median on-sky separation between reference
objects and sources in "matches" (`lsst.geom.Angle`)
- ``matchMeta`` : metadata needed to unpersist matches
(`lsst.daf.base.PropertyList`)
Raises
------
TaskError
If the measured mean on-sky distance between the matched source and
reference objects is greater than
``self.config.maxMeanDistanceArcsec``.
Notes
-----
ignores config.forceKnownWcs
Definition at line 182 of file astrometry.py.
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staticprotected |
Definition at line 119 of file astrometry.py.
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static |
Definition at line 118 of file astrometry.py.
| lsst.meas.astrom.astrometry.AstrometryTask.usedKey |
Definition at line 125 of file astrometry.py.