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Proceedings Paper

Data processing and in-flight calibration systems for OMI-EOS-Aura
Author(s): G. H. J. van den Oord; M. Dobber; J. van de Vegte; I. van der Neut; W. Som de Cerff; N. C. Rozemeijer; V. Schenkelaars; M. ter Linden
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Paper Abstract

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.

Paper Details

Date Published: 7 September 2006
PDF: 12 pages
Proc. SPIE 6296, Earth Observing Systems XI, 62960S (7 September 2006); doi: 10.1117/12.680537
Show Author Affiliations
G. H. J. van den Oord, Royal Netherlands Meteorological Institute (Netherlands)
M. Dobber, Royal Netherlands Meteorological Institute (Netherlands)
J. van de Vegte, Royal Netherlands Meteorological Institute (Netherlands)
I. van der Neut, Royal Netherlands Meteorological Institute (Netherlands)
W. Som de Cerff, Royal Netherlands Meteorological Institute (Netherlands)
N. C. Rozemeijer, TriOpSys (Netherlands)
V. Schenkelaars, Dutch Space (Netherlands)
M. ter Linden, Dutch Space (Netherlands)

Published in SPIE Proceedings Vol. 6296:
Earth Observing Systems XI
James J. Butler, Editor(s)

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