Single stamp centered on a bright star, normalized by its
annularFlux.
Parameters
----------
stamp_im : `lsst.afw.image.MaskedImage`
Pixel data for this postage stamp
position : `lsst.geom.Point2I`
Origin of the stamps in its origin exposure (pixels)
gaiaGMag : `float`
Gaia G magnitude for the object in this stamp
gaiaId : `int`
Gaia object identifier
annularFlux : `Optional[float]`
Flux in an annulus around the object
Definition at line 42 of file brightStarStamps.py.
def lsst.meas.algorithms.brightStarStamps.BrightStarStamp.factory |
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cls, |
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stamp_im, |
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metadata, |
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idx, |
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archive_element = None |
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) |
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This method is needed to service the FITS reader.
We need a standard interface to construct objects like this.
Parameters needed to construct this object are passed in via
a metadata dictionary and then passed to the constructor of
this class. This particular factory method requires keys:
G_MAGS, GAIA_IDS, and ANNULAR_FLUXES. They should each
point to lists of values.
Parameters
----------
stamp_im : `lsst.afw.image.MaskedImage`
Pixel data to pass to the constructor
metadata : `dict`
Dictionary containing the information
needed by the constructor.
idx : `int`
Index into the lists in ``metadata``
archive_element : `lsst.afwTable.io.Persistable`, optional
Archive element (e.g. Transform or WCS) associated with this stamp.
Returns
-------
brightstarstamp : `BrightStarStamp`
An instance of this class
Reimplemented from lsst.meas.algorithms.stamps.AbstractStamp.
Definition at line 67 of file brightStarStamps.py.
def lsst.meas.algorithms.brightStarStamps.BrightStarStamp.measureAndNormalize |
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self, |
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annulus, |
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statsControl = afwMath.StatisticsControl() , |
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statsFlag = afwMath.stringToStatisticsProperty("MEAN") , |
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badMaskPlanes = ('BAD', 'SAT', 'NO_DATA') |
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) |
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Compute "annularFlux", the integrated flux within an annulus
around an object's center, and normalize it.
Since the center of bright stars are saturated and/or heavily affected
by ghosts, we measure their flux in an annulus with a large enough
inner radius to avoid the most severe ghosts and contain enough
non-saturated pixels.
Parameters
----------
annulus : `lsst.afw.geom.spanSet.SpanSet`
SpanSet containing the annulus to use for normalization.
statsControl : `lsst.afw.math.statistics.StatisticsControl`, optional
StatisticsControl to be used when computing flux over all pixels
within the annulus.
statsFlag : `lsst.afw.math.statistics.Property`, optional
statsFlag to be passed on to ``afwMath.makeStatistics`` to compute
annularFlux. Defaults to a simple MEAN.
badMaskPlanes : `collections.abc.Collection` [`str`]
Collection of mask planes to ignore when computing annularFlux.
Definition at line 106 of file brightStarStamps.py.