lsst.meas.astrom g0a0026dc87+d77ddbe0fb
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Public Member Functions | |
__init__ (self, refObjLoader=None, 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; gen3 pipeline tasks will pass `None` and call `setRefObjLoader` in `runQuantum`. 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 = None , |
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schema = None , |
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** | kwargs | ||
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Reimplemented from lsst.meas.astrom.ref_match.RefMatchTask.
Definition at line 122 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 344 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 442 of file astrometry.py.
lsst.meas.astrom.astrometry.AstrometryTask.run | ( | self, | |
sourceCat, | |||
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 134 of file astrometry.py.
lsst.meas.astrom.astrometry.AstrometryTask.solve | ( | self, | |
exposure, | |||
sourceCat | |||
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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 183 of file astrometry.py.
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staticprotected |
Definition at line 120 of file astrometry.py.
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static |
Definition at line 119 of file astrometry.py.
lsst.meas.astrom.astrometry.AstrometryTask.usedKey |
Definition at line 126 of file astrometry.py.