Quality Control Level 1 consists of quality checks on pipeline-processed data.
Parts of the QC1 parameters are provided by the NACO
pipeline in qc.paf files, others are measured by post-pipeline procedures, on
master calibration files and reduced files. The purpose of measuring QC1 parameters
- to assess the quality
of calibration products (e.g. noise properties, image quality,
compare with expected/nominal values (e.g. gain)
assess the performance of the instrument (e.g. efficiency),
monitor efficiency of master creation process (e.g. reduction of random noise).
The result of the QC1 process is used to
whether master creation data are certified or rejected,
the quality of the reduction process.
master calibration data created by QC Garching are quality-checked. Apart from
measuring QC1 parameters, these files are also checked for "unusual"
effects like overexposure, misalignment of gratings etc.
the moment, the QC1 data are internally used for decision making and building
a trending database. It is planned to provide them as part of the SM package,
as well as store them in the Science Archive.
In practice we launch
for each piepeline product a qc script which generates a qc plot for that product
showing the most relevant features of the product. Furthermore the qc scripts
extract or determine QC1 parameters and store them in a database.