Monitor long-term instrumental trends for the Survey. Assign quality indicator to every scan and feed back to survey scheduler. Weekly or Monthly examine large scale photometric and astrometric uniformity. Monitor long-term trends in photometric zero points and extinction terms and update and improve standard star archive photometry. Complete reprocessing of data with optimal parameters, and full scan overlap information.
Tape successfully validates.
Photometric quality of night passes minimum acceptable criteria. Nominal sensitivity of camera as gauged from calibration scan repeats is within Level 1 specifications, in context of seeing and BG conditions. Nightly averaged scan step size and array rotations within tolerances for optimal dithering pattern. Optical system does not exhibit problems related to focus, distortion, etc. Scan is bounded in time by at least 3 valid calibration intervals.