MatchedMultiVisitDataset¶

class lsst.validate.drp.matchreduce.MatchedMultiVisitDataset(repo, dataIds, matchRadius=None, safeSnr=50.0, verbose=False)[source]¶

Container for matched star catalogs from multple visits, with filtering, summary statistics, and modelling.

MatchedMultiVisitDataset instances are serializable to JSON.

Parameters:

repo : string

The repository. This is generally the directory on disk that contains the repository and mapper.

dataIds : list of dict

List of butler data IDs of Image catalogs to compare to reference. The calexp cpixel image is needed for the photometric calibration.

matchRadius : afwGeom.Angle(), optional

Radius for matching. Default is 1 arcsecond.

safeSnr : float, optional

Minimum median SNR for a match to be considered “safe”.

verbose : bool, optional

Output additional information on the analysis steps.

Attributes

filterName	(str) Name of filter used for all observations.
mag	(ndarray) Mean PSF magnitudes of stars over multiple visits (magnitudes).
magerr	(ndarray) Median 1-sigma uncertainty of PSF magnitudes over multiple visits (magnitudes).
magrms	RMS of PSF magnitudes over multiple visits (magnitudes).
snr	Median signal-to-noise ratio of PSF magnitudes over multiple visits (magnitudes).
dist	RMS of sky coordinates of stars over multiple visits (milliarcseconds).
goodMatches	all good matches, as an afw.table.GroupView; good matches contain only objects whose detections all have 1. a PSF Flux measurement with S/N > 1 2. a finite (non-nan) PSF magnitude. This separate check is largely to reject failed zeropoints. 3. and do not have flags set for bad, cosmic ray, edge or saturated Not serialized.
safeMatches	safe matches, as an afw.table.GroupView. Safe matches are good matches that are sufficiently bright and sufficiently compact. Not serialized.
magKey	Key for “base_PsfFlux_mag” in the goodMatches and safeMatches catalog tables. Not serialized.