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A LUT approach for biophysical parameter retrieval by RT model inversion applied to data from wide field of view sensors.

Dorigo, Wouter und Richter, Rolf und Müller, Andreas (2005) A LUT approach for biophysical parameter retrieval by RT model inversion applied to data from wide field of view sensors. In: Proc. 4th EARSeL Workshop on Imaging Spectroscopy, Seiten 599-607. 4th EARSeL Workshop on Imaging Spectroscopy, 2005-04-27 - 2005-04-29, Warsaw. ISBN 83-89502-41-0.

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Since many years scientists have been working on techniques for retrieving biophysical and bio-chemical canopy parameters from remote sensing data. Recently the inversion of canopy reflec-tance models has been well established as a reliable alternative to the classical empirical ap-proaches. However, still a few obstacles have to be taken for making this technique fully opera-tional. In this context a lookup table approach was developed for the inversion of the combined leaf and canopy reflectance model PROSPECT+SAILH. The approach contains some elements that enable the use of scene specific information, such as the option of performing the inversion per user-defined land cover class. This may lead both to a more reliable parameter estimation as well as to a reduced calculation time since the algorithm does not have to take into account all possible reflectance cases within a scene. An important aspect of the inversion algorithm is the possibility to incorporate pixel based information on view geometry thus using the information con-tained in BRDF signatures instead of correcting for it. The model was tested on HyMap hyperspectral imagery of summer 2003 taken of the area sur-rounding Lake Waging-Taching in Southeast Germany. Scan angle and azimuth information con-tained in a file resulting from parametric geocoding was used to assess the spatial variation of view geometry to the separate pixels. Compared to the case in which only nadir view information is used, the model performed significantly better in the sense that it eliminated biased parameter estimations induced by BRDF effects. A comparison of parameter values estimated from data of the same area, but with different flight and sun configurations, shows that the results are much more consistent when view geometry is taken into account, even though measurements were not taken in the principal plane, and were supposed to be little affected by directional influences. A validation with measured field parameters is yet to be performed.

Dokumentart:Konferenzbeitrag (Poster)
Titel:A LUT approach for biophysical parameter retrieval by RT model inversion applied to data from wide field of view sensors.
AutorenInstitution oder E-Mail-Adresse der Autoren
Erschienen in:Proc. 4th EARSeL Workshop on Imaging Spectroscopy
Referierte Publikation:Ja
In ISI Web of Science:Nein
Seitenbereich:Seiten 599-607
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Stichwörter:PROSPECT, SAIL, Hyperspectral, HyMAP
Veranstaltungstitel:4th EARSeL Workshop on Imaging Spectroscopy
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2005-04-27 - 2005-04-29
Veranstalter :EARSeL & Warsaw University
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Geowissenschaftl. Fernerkundungs- und GIS-Verfahren (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Deutsches Fernerkundungsdatenzentrum > Umwelt und Sicherheit > Umwelt und Geoinformation
Hinterlegt von: Wouter Dorigo
Hinterlegt am:16 Aug 2006
Letzte Änderung:14 Jan 2010 23:09

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