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Bi-directional reflectance measurements with the CCD line camera WAAC

Demircan, A. and Geiger, B. and Radke, M. and Schönermark, M. von (2000) Bi-directional reflectance measurements with the CCD line camera WAAC. Remote Sensing Reviews, 19 (1/4), pp. 95-110.

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Abstract

In order to determine the Bi-directional Reflectance Distribution Function (BRDF) of natural surfaces under natural conditions with high angular resolution a CCD line camera is used. We demonstrate the principle of the method with the Wide Angle Airborne Camera (WAAC) which was developed at the DLR for airborne stereo imaging purposes. The camera is mounted on a rotating device and an extendible boom provides an aerial platform. The arrangement is such that one end of the CCD line looks in nadir direction and the other end stretches to a view zenith angle of 80 degrees. Rotating the camera around a vertical axis makes it possible to measure almost the complete reflectance distribution of the surface below in a very short time. First measurements were carried out in the NIR spectral region to determine the BRDF of several surface types including various crops. We discuss smoothing strategies to obtain the BRDF from the raw data and present some examples of the results. We plan to continue the BRDF measurements for a variety of natural surfaces in order to understand the diurnal and seasonal variations and to compile an archive of BRDF data.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1999,
Title:Bi-directional reflectance measurements with the CCD line camera WAAC
Authors:
AuthorsInstitution or Email of Authors
Demircan, A.UNSPECIFIED
Geiger, B.UNSPECIFIED
Radke, M.UNSPECIFIED
Schönermark, M. vonUNSPECIFIED
Date:2000
Journal or Publication Title:Remote Sensing Reviews
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:19
Page Range:pp. 95-110
Status:Published
Keywords:BRDF, CCD line camera, WAAC
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):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institut für Weltraumsensorik und Planetenerkundung
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 18:28

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