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Sensitivity of the ground-based downwelling irradiance recorded by the FODIS sensor in respect of different angular positions


Homolova, L; Alanko-Huotari, K; Schaepman, M E (2009). Sensitivity of the ground-based downwelling irradiance recorded by the FODIS sensor in respect of different angular positions. In: First Workshop on Hyperspectral Image and Signal Processing: evolution in remote sensing (WHISPERS 2009), Grenoble, FR, 26 August 2009 - 28 August 2009.

Abstract

Some airborne hyperspectral sensors (e.g. AISA) can
measure spectral downwelling irradiance using an additional
cosine sensor mounted on a roof of an aircraft. The
downwelling irradiance data, however, are rarely used for
any atmospheric correction or compensation of different
sun-sensor geometry, partly because they are sensitive
towards continuous motion of the airborne platform.
The airborne hyperspectral system AISA Eagle (Specim,
Ltd., Finland), combined with the Fiber Optic Downwelling
Irradiance Sensor (FODIS), were used for ground-based
outdoor static measurements. The FODIS sensor was tilted
into various zenith and azimuth angles. The data analysis
revealed high sensitivity of the raw recorded FODIS signal
towards different angular position. Simple cosine corrections reduced variation in the recorded FODIS signal. The variability (standard deviation of all measurements)
decreased by 88% after the cosine correction was applied.

Abstract

Some airborne hyperspectral sensors (e.g. AISA) can
measure spectral downwelling irradiance using an additional
cosine sensor mounted on a roof of an aircraft. The
downwelling irradiance data, however, are rarely used for
any atmospheric correction or compensation of different
sun-sensor geometry, partly because they are sensitive
towards continuous motion of the airborne platform.
The airborne hyperspectral system AISA Eagle (Specim,
Ltd., Finland), combined with the Fiber Optic Downwelling
Irradiance Sensor (FODIS), were used for ground-based
outdoor static measurements. The FODIS sensor was tilted
into various zenith and azimuth angles. The data analysis
revealed high sensitivity of the raw recorded FODIS signal
towards different angular position. Simple cosine corrections reduced variation in the recorded FODIS signal. The variability (standard deviation of all measurements)
decreased by 88% after the cosine correction was applied.

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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:28 August 2009
Deposited On:19 Mar 2010 12:31
Last Modified:18 Feb 2018 00:30
ISBN:978-1-4244-4686-5
Additional Information:Alternativer Kongressname: First IEEE GRSS Workshop on Hyperspectral Image and Signal Processing (WHISPERS 2009). - © 2009 IEEE. 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
OA Status:Green
Publisher DOI:https://doi.org/10.1109/WHISPERS.2009.5289084
Official URL:http://www.wikicfp.com/cfp/servlet/event.showcfp?eventid=4577&copyownerid=2

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