CRDS Reference Files

This directory contains a collection of notebooks that guide users through the structure, content, and usage of Calibration Reference Data System (CRDS) reference files for the Roman Wide Field Instrument (WFI).

The notebooks are designed as standalone tutorials but can be followed sequentially for a complete introduction to how reference files are retrieved, inspected, and visualized.

The CRDS reference files overview explains what CRDS is, how reference files are matched and delivered, and how to use crds.getreferences() and crds.getrecommendations().

Individual Reference File Notebooks

These notebooks cover most of the reference files used by the Roman Calibration Pipeline:

Reference type	Purpose	Notebook
MASK (Bad Pixel Mask)	Bad-pixel identification and data-quality flags	bad_pixels_mask_reffile.ipynb
DARK	Dark-current correction	dark_reffile.ipynb
SATURATION	Per-pixel saturation thresholds	saturation_reffile.ipynb
FLAT	Pixel-to-pixel sensitivity correction	flat_reffile.ipynb
REFPIX	Reference-pixel correction	reference_pixel_reffile.ipynb
DISTORTION	Astrometric-distortion modeling	distortion_reffile.ipynb
PHOTOM	Photometric calibration	photom_reffile.ipynb
GAIN	Conversion from DN to electrons	gain_reffile.ipynb
READNOISE	Read-noise characterization	readnoise_reffile.ipynb
AREA	Pixel solid-angle mapping	area_reffile.ipynb
PSF / ePSF	Empirical point-spread functions	psf_reffile.ipynb
LINEARITY	Detector nonlinearity correction	linearity_reffile.ipynb