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A new model-driven correction factor for BRDF effects in hyperspectral remote sensing data

Feingersh, Tal and Dorigo, Wouter and Richter, Rolf and Ben-Dor, Eyal (2005) A new model-driven correction factor for BRDF effects in hyperspectral remote sensing data. In: Proc. 4th EARSeL Workshop on Imaging Spectroscopy, pp. 565-576. 4th EARSeL Workshop on Imaging Spectroscopy, 2005-04-27 - 2005-04-29, Warsaw. ISSN 83-89502-41-0

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Abstract

Interpretation of hyperspectral remotely sensed (HRS) imagery can be degraded by bi-directional reflectance distribution function (BRDF) effects that contribute an unknown amount of error to reflectance values. In this work we test a new empirical approach, using in-flight records concerning sensor and sun geometry at the time of acquisition, and laboratory BRDF measurements of selected land-cover classes from the new Israeli Goniometric Facility (IGF) at the remote sensing laboratory, Tel-Aviv University. BRDF datasets are then nadir-normalized (i.e. transformed to anisotropy), spectrally resampled to the required sensor and inverted to form correction vectors for the real imagery. These correction vectors are finally applied only to class-specific pixels of interest. We demonstrate this application for a non-georeferenced CASI image and four georeferenced HyMAP images and discuss results. The CASI data preliminary average anisotropy reaches 20% and corrects down to 5%. Its RMSE values are reduced by about 40-70%. HyMAP data Uses the same model and reduces average pre-correction ANIF by 25-50%, depending on wavelength. Since angular information about the sensor is the base for this correction, natural variability of the corrected land-cover classes is maintained. Therefore this method allows a class-specific BRDF correction that improves interpretation capability and quantitative analysis.

Document Type:Conference or Workshop Item (Speech)
Title:A new model-driven correction factor for BRDF effects in hyperspectral remote sensing data
Authors:
AuthorsInstitution or Email of Authors
Feingersh, TalUNSPECIFIED
Dorigo, WouterUNSPECIFIED
Richter, RolfUNSPECIFIED
Ben-Dor, EyalUNSPECIFIED
Date:2005
Journal or Publication Title:Proc. 4th EARSeL Workshop on Imaging Spectroscopy
Refereed publication:Yes
In ISI Web of Science:No
Page Range:pp. 565-576
Editors:
EditorsEmail
Zagajewski, B.UNSPECIFIED
Sobczak, M.UNSPECIFIED
ISSN:83-89502-41-0
Status:Published
Keywords:CASI, Hyperspectral, HyMAP, BRDF, correction
Event Title:4th EARSeL Workshop on Imaging Spectroscopy
Event Location:Warsaw
Event Type:international Conference
Event Dates:2005-04-27 - 2005-04-29
Organizer:EARSeL & Warsaw University
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Environment and Security > Environment and Geoinformation
Deposited By: Wouter Dorigo
Deposited On:16 Aug 2006
Last Modified:14 Jan 2010 23:08

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