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Spectral stability monitoring of an imaging spectrometer by means of onboard sources


D’Odorico, P; Alberti, E; Dell'Endice, F; Hueni, A; Schaepman, M E (2009). Spectral stability monitoring of an imaging spectrometer by means of onboard sources. In: 2009 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2009), Cape Town, South Africa, 12 July 2009 - 17 July 2009, I 72 -I 75.

Abstract

The In-Flight Characterization (IFC) facility of the Airborne Prism Experiment (APEX) is presumably the first onboard characterization unit implemented in an airborne imaging spectrometer. This study is meant to test methodologies for the retrieval of temporal relative center wavelength drifts based on IFC data. A rare Earth material filter with a set of well-known absorption features is imaged through the IFC on APEX and recorded at several time positions. The shift of the center wavelengths covered by a spectral feature is estimated by means of curve matching algorithms. Two algorithms are evaluated: in the former the shift is determined by using the correlation coefficient as merit function to determine changes of the feature shape and
position, while the latter evaluates the distance between
centers of gravity. These methods have demonstrated an
uncertainty in the order of 6-9 % of a pixel. A test case has been designed in which the APEX system was exposed to a temperature profile with a thermal excursion of 26°C, reproducing flight conditions. Results show the spectral stability of the APEX imaging spectrometer.

Abstract

The In-Flight Characterization (IFC) facility of the Airborne Prism Experiment (APEX) is presumably the first onboard characterization unit implemented in an airborne imaging spectrometer. This study is meant to test methodologies for the retrieval of temporal relative center wavelength drifts based on IFC data. A rare Earth material filter with a set of well-known absorption features is imaged through the IFC on APEX and recorded at several time positions. The shift of the center wavelengths covered by a spectral feature is estimated by means of curve matching algorithms. Two algorithms are evaluated: in the former the shift is determined by using the correlation coefficient as merit function to determine changes of the feature shape and
position, while the latter evaluates the distance between
centers of gravity. These methods have demonstrated an
uncertainty in the order of 6-9 % of a pixel. A test case has been designed in which the APEX system was exposed to a temperature profile with a thermal excursion of 26°C, reproducing flight conditions. Results show the spectral stability of the APEX imaging spectrometer.

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Additional indexing

Item Type:Conference or Workshop Item (Paper), not refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Event End Date:17 July 2009
Deposited On:13 Mar 2010 11:17
Last Modified:07 Dec 2017 01:17
ISBN:978-1-4244-3395-7
Additional Information:Copyright 2009 IEEE. Published in the IEEE 2009 International Geoscience & Remote Sensing Symposium (IGARSS 2009), scheduled for July 13-17, 2009 in Cape Town, South Africa. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works, must be obtained from the IEEE. Contact: Manager, Copyrights and Permissions / IEEE Service Center / 445 Hoes Lane / P.O. Box 1331 / Piscataway, NJ 08855-1331, USA. Telephone: + Intl. 908-562-3966.
Publisher DOI:https://doi.org/10.1109/IGARSS.2009.5416939
Official URL:http://www.igarss09.org/default.asp
Related URLs:http://ieeexplore.ieee.org (Publisher)

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