Image calibration#
The process of transforming a post-ISR image into a science-ready visit_image.
The Monster catalog#
A whole-sky standard star catalog built specifically for LSST.
Photometric calibration#
Photometric calibrations relate the counts (electrons) measured by the camera to the incident flux from a source at Earth before it enters the atmosphere.
Astrometric calibration#
Astrometric calibrations define the World Coordinate System (WCS) of an image, the relation between pixel coordinates and sky coordinates (Right Ascension and Declination).
Point spread function modeling#
Characterizing how the optical system and atmosphere “blur” a point source into a two-dimensional shape on the detector.
Background subtraction#
Removing the sky background flux from the image.