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Proceedings Paper

On-orbit radiometric calibration using a solar diffuser
Author(s): Keith Stuart Krause; Stuart F. Biggar; Kurtis J. Thome; Jim Eagen; Dave Kenyon
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Paper Abstract

Radiometric calibration of spacecraft sensors using an on-board diffuser has become an accepted method in recent years for sensors operating in the solar-reflective portion of the spectrum. In many of these approaches, the radiance from a sunlit diffuser is used to illuminate the full aperture and full optical path of the sensor. If both the bi-directional reflectance distribution function (BRDF) of the diffuser and the incident solar irradiance are known, the absolute radiance from the diffuser can be used to determine the absolute radiometric calibration of the sensor. In this work, a method for the absolute radiometric calibration using a diffuser made of S13G/LO paint for a silicon-based detector sensor with spectral bands similar to Landsat-7 ETM+ is discussed. The spectral BRDF of a witness sample of the diffuser was measured with the goniometric facility at the Remote Sensing Group of the Optical Sciences Center at the University of Arizona. A measured solar spectral irradiance spectra is used to model the radiance at the sensor entrance pupil. Also presented is a sensitivity analysis of the diffuser-leaving radiance as a function of sensor view and incident solar angle. This sensitivity analysis is used to provide an error estimate for the calibration of the sensor using a diffuser based on the S13G/LO paint.

Paper Details

Date Published: 18 January 2002
PDF: 11 pages
Proc. SPIE 4483, Earth Observing Systems VI, (18 January 2002); doi: 10.1117/12.453447
Show Author Affiliations
Keith Stuart Krause, Optical Sciences Ctr./Univ. of Arizona (United States)
Stuart F. Biggar, Optical Sciences Ctr./Univ. of Arizona (United States)
Kurtis J. Thome, Optical Sciences Ctr./Univ. of Arizona (United States)
Jim Eagen, Orbital Sciences Corp. (United States)
Dave Kenyon, Orbital Sciences Corp. (United States)

Published in SPIE Proceedings Vol. 4483:
Earth Observing Systems VI
William L. Barnes, Editor(s)

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