Advanced radiometry measurements and Earth science applications with the Airborne Prism Experiment (APEX)
dc.contributor.author
Schaepman, Michael E.
dc.contributor.author
Jehle, Michael
dc.contributor.author
Hueni, Andreas
dc.contributor.author
D'Odorico, Petra
dc.contributor.author
Damm, Alexander
dc.contributor.author
Weyermann, Jürg
dc.contributor.author
Schneider, Fabian D.
dc.contributor.author
Laurent, Valérie
dc.contributor.author
Popp, Christoph
dc.contributor.author
Seidel, Felix C.
dc.contributor.author
Lenhard, Karim
dc.contributor.author
Gege, Peter
dc.contributor.author
Küchler, Christoph
dc.contributor.author
Brazile, Jason
dc.contributor.author
Kohler, Peter
dc.contributor.author
Vos, Lieve de
dc.contributor.author
Meuleman, Koen
dc.contributor.author
Meynart, Roland
dc.contributor.author
Schläpfer, Daniel
dc.contributor.author
Kneubühler, Mathias
dc.contributor.author
Itten, Klaus I.
dc.date.accessioned
2019-12-02T16:45:38Z
dc.date.available
2017-06-11T14:23:27Z
dc.date.available
2019-12-02T16:45:38Z
dc.date.issued
2015-03
dc.identifier.issn
0034-4257
dc.identifier.other
10.1016/j.rse.2014.11.014
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/93931
dc.identifier.doi
10.3929/ethz-b-000093931
dc.description.abstract
We present the Airborne Prism Experiment (APEX), its calibration and subsequent radiometric measurements as well as Earth science applications derived from this data. APEX is a dispersive pushbroom imaging spectrometer covering the solar reflected wavelength range between 372 and 2540 nm with nominal 312 (max. 532) spectral bands. APEX is calibrated using a combination of laboratory, in-flight and vicarious calibration approaches. These are complemented by using a forward and inverse radiative transfer modeling approach, suitable to further validate APEX data. We establish traceability of APEX radiances to a primary calibration standard, including uncertainty analysis. We also discuss the instrument simulation process ranging from initial specifications to performance validation. In a second part, we present Earth science applications using APEX. They include geometric and atmospheric compensated as well as reflectance anisotropy minimized Level 2 data. Further, we discuss retrieval of aerosol optical depth as well as vertical column density of NOx, a radiance data-based coupled canopy–atmosphere model, and finally measuring sun-induced chlorophyll fluorescence (Fs) and infer plant pigment content. The results report on all APEX specifications including validation. APEX radiances are traceable to a primary standard with < 4% uncertainty and with an average SNR of > 625 for all spectral bands. Radiance based vicarious calibration is traceable to a secondary standard with ≤ 6.5% uncertainty. Except for inferring plant pigment content, all applications are validated using in-situ measurement approaches and modeling. Even relatively broad APEX bands (FWHM of 6 nm at 760 nm) can assess Fs with modeling agreements as high as R2 = 0.87 (relative RMSE = 27.76%). We conclude on the use of high resolution imaging spectrometers and suggest further development of imaging spectrometers supporting science grade spectroscopy measurements.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc-nd/3.0/
dc.subject
Imaging spectroscopy
en_US
dc.subject
Earth observation
en_US
dc.subject
APEX
en_US
dc.subject
Calibration
en_US
dc.subject
Processing
en_US
dc.subject
Validation
en_US
dc.subject
Earth science applications
en_US
dc.title
Advanced radiometry measurements and Earth science applications with the Airborne Prism Experiment (APEX)
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported
dc.date.published
2014-12-05
ethz.journal.title
Remote Sensing of Environment
ethz.journal.volume
158
en_US
ethz.journal.abbreviated
Remote Sens. Environ.
ethz.pages.start
207
en_US
ethz.pages.end
219
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.scopus
ethz.identifier.nebis
000053663
ethz.publication.place
Amsterdam
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02703 - Institut für Agrarwissenschaften / Institute of Agricultural Sciences::03648 - Buchmann, Nina / Buchmann, Nina
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02703 - Institut für Agrarwissenschaften / Institute of Agricultural Sciences::03648 - Buchmann, Nina / Buchmann, Nina
ethz.date.deposited
2017-06-11T14:23:47Z
ethz.source
ECIT
ethz.identifier.importid
imp593652a1ed01686484
ethz.ecitpid
pub:147759
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-13T08:26:37Z
ethz.rosetta.lastUpdated
2022-03-29T00:24:17Z
ethz.rosetta.versionExported
true
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