[to complete] NIR Master Dark

Metadata

Data product name

DpdNirMasterDarkFrame

Data product custodian

NIR

Name of the Schema file

euc-nir-MasterDark.xsd

Processing Element(s) creating/using the data product

The MasterDark frame is a Calibration Data product created by the NIR_MasterDark_Pipeline which combines dedicated dark frames to create a MEF file.

The task responsible for MasterDark creation is MakeMasterDarkProg (under NIR_DarkBiasSubtraction project).

Processing function using the data product

This is an internal NIR data product, and it is used only by the NIR PF.

It is applied by DarkSubtractionProgram task (under NIR_DarkBiasSubtraction project) in the NIR_ProcessField_Pipeline and in most of the calibration pipelines.

Data Product structure description

The main elements inside the Data section are:

  • Filter: The filter name (e.g. NIR_Y, NIR_J, NIR_H)

  • ValidityRange: Calibration file validity period estimated

  • MSDParameters: The collection of some parameters specific for MasterDark creation

    • FrameNumbers: Number of dark frames that went into the Master Dark creation. Corresponding to NFRAME primary header keyword

    • TotalExposureTime: Total exposure time in seconds. Corresponding to EXPTOT primary header keyword

    • FocalPlaneTemperature: Focal plane temperature. Corresponding to FP_TEMP primary header keyword

  • DataStorage: Element that links to a FITS file containing the MasterDark FITS file

  • QualityParams (optional): List of Detector Data Quality Parameters

    • Min: Minimum image pixel value

    • Max: Maximum image pixel value

    • Mean: Average image level (mean of all image pixel values)

    • Median: Median image level (median of all image pixel values)

    • MAD: Median Absolute Deviation of the image pixel values

    • MaskedPixelFraction: The fraction of masked pixels

    • NoisePixelNumber: Number of high noise pixels with filled dark values. NDFILL detector header

FITS file description

The structure of the NIR MasterDark is the same as the Science Image of the NIR Calibrated Frame with 16 x 3 layers, i.e. containing median dark current, RMS, and Data Quality flags for each detector.

Primary header

The primary header contains keywords to identify FITS data type and some others (e.g. NFRAME, EXPTOT, FP_TEMP) dedicated to track specific MSDParameters.