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The OMI instrument that flies on the EOS Aura mission was launched in July 2004. OMI is a UV-VIS imaging
spectrometer that measures in the 270 - 500 nm wavelength range. OMI provides daily global coverage with high
spatial resolution. Every orbit of 100 minutes OMI generates about 0.5 GB of Level 0 data and 1.2 GB of Level 1 data.
About half of the Level 1 data consists of in-flight calibration measurements. These data rates make it necessary to
automate the process of in-flight calibration. For that purpose two facilities have been developed at KNMI in the
Netherlands: the OMI Dutch Processing System (ODPS) and the Trend Monitoring and In-flight Calibration Facility
(TMCF). A description of these systems is provided with emphasis on the use for radiometric, spectral and detector
calibration and characterization.
With the advance of detector technology and the need for higher spatial resolution, data rates will become even higher
for future missions. To make effective use of automated systems like the TMCF, it is of paramount importance to
integrate the instrument operations concept, the information contained in the Level 1 (meta-)data products and the inflight
calibration software and system databases. In this way a robust but also flexible end-to-end system can be
developed that serves the needs of the calibration staff, the scientific data users and the processing staff. The way this
has been implemented for OMI may serve as an example of a cost-effective and user friendly solution for future
missions. The basic system requirements for in-flight calibration are discussed and examples are given how these
requirements have been implemented for OMI. Special attention is paid to the aspect of supporting the Level 0 - 1 processing with timely and accurate calibration constants.
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