observation_summary_stats#

Various statistics obtained from a single observation.

Versions#

Version

Status

1.0.0

current

  • Canonical URL: https://images.lsst.io/schemas/observation_summary_stats-1.0.0

  • Raw JSON schema

Composition#

        classDiagram
  class ObservationSummaryStats["ObservationSummaryStats"] {
    +str schema_version
    +int min_read_version
    +dict~str, MetadataValue~ metadata
    +list~Any~ indirect
    +float psfSigma
    +float psfArea
    +float psfIxx
    +float psfIyy
    +float psfIxy
    +float ra
    +float dec
    +float pixelScale
    +float zenithDistance
    +float expTime
    +float zeroPoint
    +float skyBg
    +float skyNoise
    +float meanVar
    +tuple~float, float, float, float~ raCorners
    +tuple~float, float, float, float~ decCorners
    +float psfAdaptiveThresholdValue
    +float psfAdaptiveIncludeThresholdMultiplier
    +int nShapeletsStar
    +float shapeletsOnlyIqScore
    +float shapeletsIqScore
    +tuple~float, ...~ shapeletsCoeffs
    +float centroidDiffShapeletsVsSlotMedian
    +float shapeletsStarEMedian
    +float shapeletsStarUnNormalizedEMedian
    +float refCatSourceDensity
    +float astromOffsetMean
    +float astromOffsetStd
    +int nPsfStar
    +float psfStarDeltaE1Median
    +float psfStarDeltaE2Median
    +float psfStarDeltaE1Scatter
    +float psfStarDeltaE2Scatter
    +float psfStarDeltaSizeMedian
    +float psfStarDeltaSizeScatter
    +float psfStarScaledDeltaSizeScatter
    +float psfTraceRadiusDelta
    +float psfApFluxDelta
    +float psfApCorrSigmaScaledDelta
    +float maxDistToNearestPsf
    +float starEMedian
    +float starUnNormalizedEMedian
    +float starComa1Median
    +float starComa2Median
    +float starTrefoil1Median
    +float starTrefoil2Median
    +float starKurtosisMedian
    +float starE41Median
    +float starE42Median
    +float effTime
    +float effTimePsfSigmaScale
    +float effTimeSkyBgScale
    +float effTimeZeroPointScale
    +float magLim
    +float psfTE1e1
    +float psfTE1e2
    +float psfTE1ex
    +float psfTE2e1
    +float psfTE2e2
    +float psfTE2ex
    +float psfTE3e1
    +float psfTE3e2
    +float psfTE3ex
    +float psfTE4e1
    +float psfTE4e2
    +float psfTE4ex
  }
  class ButlerInfo["ButlerInfo"] {
  }
  class SerializedDatasetRef["SerializedDatasetRef"] {
    +UUID id
    +str | None run
    +str | None component
  }
  class SerializedDatasetType["SerializedDatasetType"] {
    +str name
    +str | None storageClass
    +list~str~ | None dimensions
    +str | None parentStorageClass
    +bool isCalibration
  }
  class SerializedDataCoordinate["SerializedDataCoordinate"] {
    +dict~str, int | str~ dataId
  }
  class SerializedDimensionRecord["SerializedDimensionRecord"] {
    +str definition
  }
  class Timespan["Timespan"] {
    +tuple~int, int~ nsec
  }
  class DatasetProvenance["DatasetProvenance"] {
    +UUID | None quantum_id
    +dict~UUID, dict~str, str | int | float | bool | UUID~~ extras
  }
  ObservationSummaryStats --> ButlerInfo : butler_info?
  ButlerInfo --> SerializedDatasetRef : dataset
  ButlerInfo --> DatasetProvenance : provenance
  SerializedDatasetRef --> SerializedDatasetType : datasetType?
  SerializedDatasetRef --> SerializedDataCoordinate : dataId?
  SerializedDataCoordinate --> SerializedDimensionRecord : records?
  SerializedDimensionRecord --> Timespan : record+ (+other)
  DatasetProvenance --> SerializedDatasetRef : inputs*

Fields#

Field

Type

Required

Description

astromOffsetMean

number

no

Astrometry match offset mean.

astromOffsetStd

number

no

Astrometry match offset stddev.

butler_info

ButlerInfo | null

no

Information about the butler dataset backed by this file.

centroidDiffShapeletsVsSlotMedian

number

no

Median centroid difference (sqrt((slot_x - shapelet_x)**2 + (slot_y - shapelet_y)**2)) for sources used in the shapelet decomposition (pixels).

dec

number

no

Bounding box center Declination (degrees).

decCorners

array

no

Declination of bounding box corners (degrees).

effTime

number

no

Effective exposure time calculated from psfSigma, skyBg, and zeroPoint (seconds).

effTimePsfSigmaScale

number

no

PSF scaling of the effective exposure time.

effTimeSkyBgScale

number

no

Sky background scaling of the effective exposure time.

effTimeZeroPointScale

number

no

Zeropoint scaling of the effective exposure time.

expTime

number

no

Exposure time of the exposure (seconds).

indirect

array of any

no

Serialized nested objects that may be saved or read more than once.

magLim

number

no

Magnitude limit at fixed SNR (default SNR=5) calculated from psfSigma, skyBg, zeroPoint, and readNoise.

maxDistToNearestPsf

number

no

Maximum distance of an unmasked pixel to its nearest model psf star (pixels).

meanVar

number

no

Mean variance of the weight plane (ADU**2).

metadata

object

no

Additional unstructured metadata.

min_read_version

integer

no

Smallest reader major that can interpret this tree.

nPsfStar

integer

no

Number of stars used for psf model.

nShapeletsStar

integer

no

Number of sources used in the shapelet decomposition.

pixelScale

number

no

Measured detector pixel scale (arcsec/pixel).

psfAdaptiveIncludeThresholdMultiplier

number

no

Threshold multiplier used in the adaptive threshold detection pass for PSF modelling.

psfAdaptiveThresholdValue

number

no

Threshold value used in the adaptive threshold detection pass for PSF modelling.

psfApCorrSigmaScaledDelta

number

no

Delta (max - min) of the psf flux aperture correction factors scaled (divided) by the psfSigma evaluated on a grid of unmasked pixels.

psfApFluxDelta

number

no

Delta (max - min) of the model psf aperture flux (with aperture radius of max(2, 3*psfSigma)) values evaluated on a grid of unmasked pixels.

psfArea

number

no

PSF effective area (pixels**2).

psfIxx

number

no

PSF shape Ixx (pixels**2).

psfIxy

number

no

PSF shape Ixy (pixels**2).

psfIyy

number

no

PSF shape Iyy (pixels**2).

psfSigma

number

no

PSF determinant radius (pixels).

psfStarDeltaE1Median

number

no

Psf stars median E1 residual (starE1 - psfE1).

psfStarDeltaE1Scatter

number

no

Psf stars MAD E1 scatter (starE1 - psfE1).

psfStarDeltaE2Median

number

no

Psf stars median E2 residual (starE2 - psfE2).

psfStarDeltaE2Scatter

number

no

Psf stars MAD E2 scatter (starE2 - psfE2).

psfStarDeltaSizeMedian

number

no

Psf stars median size residual (starSize - psfSize).

psfStarDeltaSizeScatter

number

no

Psf stars MAD size scatter (starSize - psfSize).

psfStarScaledDeltaSizeScatter

number

no

Psf stars MAD size scatter scaled by psfSize**2.

psfTE1e1

number

no

Per-exposure TE1e1 ~ <de1 de1> of PSF residual ellipticity, averaged over theta [0,1] arcmin via treecorr KK correlation. Dimensionless; used to form the full-survey TE1 metric.

psfTE1e2

number

no

Per-exposure TE1e2 ~ <de2 de2> of PSF residual ellipticity, averaged over theta [0,1] arcmin via treecorr KK correlation. Dimensionless; used to form the full-survey TE1 metric.

psfTE1ex

number

no

Per-exposure TE1ex ~ <de1 de2> of PSF residual ellipticity, averaged over theta [0,1] arcmin via treecorr KK correlation. Dimensionless; used to form the full-survey TE1 metric.

psfTE2e1

number

no

Per-exposure TE2e1 ~ <de1 de1> of PSF residual ellipticity, averaged over theta [5,100] arcmin via treecorr KK correlation. Dimensionless; used to form the full-survey TE2 metric.

psfTE2e2

number

no

Per-exposure TE2e2 ~ <de2 de2> of PSF residual ellipticity, averaged over theta [5,100] arcmin via treecorr KK correlation. Dimensionless; used to form the full-survey TE2 metric.

psfTE2ex

number

no

Per-exposure TE2ex ~ <de1 de2> of PSF residual ellipticity, averaged over theta [5,100] arcmin via treecorr KK correlation. Dimensionless; used to form the full-survey TE2 metric.

psfTE3e1

number

no

Per-exposure median-over-CCDs of TE3e1 ~ <de1 de1> of PSF residual ellipticity, where each CCD uses theta within [0,5] arcmin bins. Dimensionless; downstream pipelines take the 85th percentile over images to evaluate TE3.

psfTE3e2

number

no

Per-exposure median-over-CCDs of TE3e2 ~ <de2 de2> of PSF residual ellipticity, where each CCD uses theta within [0,5] arcmin bins. Dimensionless; downstream pipelines take the 85th percentile over images to evaluate TE3.

psfTE3ex

number

no

Per-exposure median-over-CCDs of TE3ex ~ <de1 de2> of PSF residual ellipticity, where each CCD uses theta within [0,5] arcmin bins. Dimensionless; downstream pipelines take the 85th percentile over images to evaluate TE3.

psfTE4e1

number

no

Per-exposure median-over-CCDs of TE4e1 ~ <de1 de1> of PSF residual ellipticity, where each CCD uses theta within [5,20] arcmin bins. Dimensionless; downstream pipelines take the 85th percentile over images to evaluate TE4.

psfTE4e2

number

no

Per-exposure median-over-CCDs of TE4e2 ~ <de2 de2> of PSF residual ellipticity, where each CCD uses theta within [5,20] arcmin bins. Dimensionless; downstream pipelines take the 85th percentile over images to evaluate TE4.

psfTE4ex

number

no

Per-exposure median-over-CCDs of TE4ex ~ <de1 de2> of PSF residual ellipticity, where each CCD uses theta within [5,20] arcmin bins. Dimensionless; downstream pipelines take the 85th percentile over images to evaluate TE4.

psfTraceRadiusDelta

number

no

Delta (max - min) of the model psf trace radius values evaluated on a grid of unmasked pixels (pixels).

ra

number

no

Bounding box center Right Ascension (degrees).

raCorners

array

no

Right Ascension of bounding box corners (degrees).

refCatSourceDensity

number

no

Source density for the detector region as computed from the loaded reference catalog (number per degrees**2).

schema_version

string

no

Data-model schema version of this tree (major.minor.patch).

shapeletsCoeffs

array of number

no

Coefficients from the PSF star shapelet decomposition.

shapeletsIqScore

number

no

The dimensionless image quality score as determined from the shapelets decomposition that includes power from the median centroid offset between those used in the decomposition and those of the centroid slot in addition to non-atmospheric decomposition coefficients. The score spans the range [0.0, 1.0] with lower values indicating better image quality.

shapeletsOnlyIqScore

number

no

The dimensionless image quality score as determined from the shapelets decomposition that includes power only from the non-atmospheric decomposition coefficients. The score spans the range [0.0, 1.0] with lower values indicating better image quality.

shapeletsStarEMedian

number

no

Median ellipticity (sqrt(starE1**2.0 + starE2**2.0)) of the sources used in the shapelet decomposition.

shapeletsStarUnNormalizedEMedian

number

no

Median un-normalized ellipticity (sqrt((starXX - starYY)**2.0 + (2.0*starXY)**2.0)) of the sources used in the shapelet decomposition (pixel**2).

skyBg

number

no

Average sky background (ADU).

skyNoise

number

no

Average sky noise (ADU).

starComa1Median

number

no

Coma-like higher-order moment combination: median M30 + M12 of the stars used in the PSF model.

starComa2Median

number

no

Coma-like higher-order moment combination: median M21 + M03 of the stars used in the PSF model.

starE41Median

number

no

Fourth-order ellipticity-like higher-order moment combination: median M40 - M04 of the stars used in the PSF model.

starE42Median

number

no

Fourth-order ellipticity-like higher-order moment combination: median 2*(M31 + M13) of the stars used in the PSF model.

starEMedian

number

no

Median ellipticity (sqrt(starE1**2.0 + starE2**2.0)) of the stars used in the PSF model.

starKurtosisMedian

number

no

Kurtosis-like higher-order moment combination: median M40 + 2*M22 + M04 of the stars used in the PSF model.

starTrefoil1Median

number

no

Trefoil-like higher-order moment combination: median M30 - 3*M12 of the stars used in the PSF model.

starTrefoil2Median

number

no

Trefoil-like higher-order moment combination: median 3*M21 - M03 of the stars used in the PSF model.

starUnNormalizedEMedian

number

no

Median un-normalized ellipticity (sqrt((starXX - starYY)**2.0 + (2.0*starXY)**2.0)) of the stars used in the PSF model.

zenithDistance

number

no

Bounding box center zenith distance (degrees).

zeroPoint

number

no

Mean zeropoint in detector (mag).
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