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Proceedings Paper

Status of use of lunar irradiance for on-orbit calibration
Author(s): Thomas C. Stone; Hugh H. Kieffer; James M. Anderson
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Paper Abstract

Routine observations of the Moon have been acquired by the Robotic Lunar Observatory (ROLO) for over four years. The ROLO instruments measure lunar radiance in 23 VNIR (Moon diameter approximately 500 pixels) and 9 SWIR (approximately 250 pixels) passbands every month when the Moon is at phase angle less than 90 degrees. These are converted to exoatmospheric values at standard distances using an atmospheric extinction model based on observations of standard stars and a NIST-traceable absolute calibration source. Reduction of the stellar images also provides an independent pathway for absolute calibration. Comparison of stellar-based and lamp-based absolute calibrations of the lunar images currently shows unacceptably large differences. An analytic model of lunar irradiance as a function of phase angle and viewing geometry is derived from the calibrated lunar images. Residuals from models which fit hundreds of observations at each wavelength average less than 2%. Comparison with SeaWiFS observations over three years reveals a small quasi-periodic change in SeaWiFS responsivity that correlates with distance from the Sun for the first two years, then departs from this correlation.

Paper Details

Date Published: 18 January 2002
PDF: 11 pages
Proc. SPIE 4483, Earth Observing Systems VI, (18 January 2002); doi: 10.1117/12.453450
Show Author Affiliations
Thomas C. Stone, U.S. Geological Survey (United States)
Hugh H. Kieffer, U.S. Geological Survey (United States)
James M. Anderson, New Mexico Institute of Mining and Technology (United States)

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

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