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.
def lsst.meas.astrom.astrometry.AstrometryTask.run |
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self, |
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sourceCat, |
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exposure |
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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.