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APEX: Radiometry under spectral shift conditions


Hueni, Andreas; Schläpfer, Daniel; Jehle, Michael (2014). APEX: Radiometry under spectral shift conditions. In: Geoscience and Remote Sensing Symposium (IGARSS), 2014 IEEE International, Québec (Canada), 13 July 2014 - 18 July 2014, 1381-1384.

Abstract

The APEX airborne imaging spectrometer has been shown to exhibit spectral shifts during in-flight conditions, linked to changes in the nitrogen gas density within the APEX optical subunit. These shifts lead to features in the recorded spectra caused by the dichroic coating used as a beam splitter between VNIR and SWIR channels. Consequently dichroic features are no longer compensated for by the radiometric calibration coefficients obtained under laboratory conditions. This paper presents results of a numerical simulation that can model the impact of spectral shifts on radiometry. As a consequence the APEX sensor model has been upgraded and according correction functions have been implemented in the APEX level 1 processor to compensate for shift dependent changes in radiometry due to the dichroic coating.

Abstract

The APEX airborne imaging spectrometer has been shown to exhibit spectral shifts during in-flight conditions, linked to changes in the nitrogen gas density within the APEX optical subunit. These shifts lead to features in the recorded spectra caused by the dichroic coating used as a beam splitter between VNIR and SWIR channels. Consequently dichroic features are no longer compensated for by the radiometric calibration coefficients obtained under laboratory conditions. This paper presents results of a numerical simulation that can model the impact of spectral shifts on radiometry. As a consequence the APEX sensor model has been upgraded and according correction functions have been implemented in the APEX level 1 processor to compensate for shift dependent changes in radiometry due to the dichroic coating.

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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:18 July 2014
Deposited On:04 Dec 2014 08:26
Last Modified:14 Aug 2017 06:03
Publisher:IEEE Xplore
ISBN:978-1-4799-5775-0
Publisher DOI:https://doi.org/10.1109/IGARSS.2014.6946692
Official URL:http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6946692

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