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Calibration monitoring using laboratory and vicarious approaches on the DAIS 7915

Strobl, Peter and Müller, Andreas and Fries, Jochen and Böhl, Hans-Rüdiger and Schaepman, M. and Zock, A. (1998) Calibration monitoring using laboratory and vicarious approaches on the DAIS 7915. In: 1st EARSel Workshop on Imaging Spectroscopy, Remote Sensing Laboratories, Universität of Zurich, Switzerland, 6-8 October 1998, pp. 119-127. 1st EARSel Workshop on Imaging Spectroscopy, Remote Sensing Laboratories, University of Zurich, Switzerland, 6-8 October 1998. ISBN 2-90 885-22-0.

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Abstract

Laboratory and vicarious calibration is performed on a regular basis for the DAIS 7915 imaging spectrometer since 1995. The laboratory method includes spectrometric, geometric and radiometric calibration using the equipment of the Laboratory Calibration Facility at DLR. The imaging spectrometer, the laboratory equipment and the methodology have been improved over time to obtain data of increased quality and to enhance the calibration accuracy. The refinement of the calibration techniques revealed certain limits to absolute radiometric calibration. Issues such as the accuracy of calibration standards and the reliability of comparative measurements must be considered. The calibration processing has been reviewed and modified to ease in-flight calibration approaches through prior removel of Kennedy scanner artifacts. Vicarious calibration experiments are conducted in order to validate the laboratory calibration and, if appropriate, adapt it to in-flight conditions. A number of differernt calibration targets have been utilized. For all targets in-situ ground spectrometric measurements are available. The reflectance spectra have been modeled to at-sensor radiance using the MODTRAN radiative transfer code. Based on the comparison of modeled data with airborne imaging spectrometer measurements the laboratory calibration was validated or corrected. In 1997 the focus was laid on a campaign carried out in Israel. Despite the favorable conditions and the considerable effort spent on ground truth the accuracy obtained does not allow to bridge the gap between laboratory and vicarious calibration for the DAIS 7915. The remaining uncertainties conceal the true magnitude and the cause of the discrepancies.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Calibration monitoring using laboratory and vicarious approaches on the DAIS 7915
Authors:
AuthorsInstitution or Email of Authors
Strobl, PeterUNSPECIFIED
Müller, AndreasUNSPECIFIED
Fries, JochenUNSPECIFIED
Böhl, Hans-RüdigerUNSPECIFIED
Schaepman, M.UNSPECIFIED
Zock, A.UNSPECIFIED
Date:1998
Journal or Publication Title:1st EARSel Workshop on Imaging Spectroscopy, Remote Sensing Laboratories, Universität of Zurich, Switzerland, 6-8 October 1998
Page Range:pp. 119-127
Editors:
EditorsEmail
EARSel, ParisUNSPECIFIED
ISBN:2-90 885-22-0
Status:Published
Event Title:1st EARSel Workshop on Imaging Spectroscopy, Remote Sensing Laboratories, University of Zurich, Switzerland, 6-8 October 1998
Organizer:EARSel, Paris, 2, avenue Rapp, 75340 PARIS CEDEX 07 - France
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Institut für Optoelektronik
Deposited By: elib DLR-Beauftragter
Deposited On:09 May 2006
Last Modified:06 Jan 2010 23:16

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