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Proceedings Paper

Results of dark target vicarious calibration using Lake Tahoe
Author(s): Robert John Parada Jr.; Kurtis J. Thome; Richard P. Santer
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Paper Abstract

The ability to conduct in-flight absolute radiometric calibrations of ocean color sensors will determine their usefulness in the decade to come. On-board calibration systems are often integrated into the overall system design of such sensors and have claimed uncertainly levels from 2-3 percent, but independent means of system calibration are desirable to confirm that such systems are operating properly. Vicarious methods are an attractive means of this verification. Due to the high sensitivity of ocean color sensors, the use for bright reflectance surfaces often results in sensor saturation. Low reflectance targets, such as water bodies, should therefore be used. This paper presents the results of sensitivity studies of the reflectance- and radiance-based approaches when applied to a water target and method uncertainties for calibrations of the Sea-Viewing Wide Field-of-view Sensor (SeaWiFS). The paper also present the results of a field campaign which took place at Lake Tahoe in June 1995. This lake represents a typical oligotrophic water body and has the advantage of being located at a high elevation where tropospheric aerosol loading is low. Aircraft-based radiance data and surface measurements of reflectance are sued to calibrate SeaWiFS- simulated bands from Advanced VIsible and Infrared Imaging Spectrometer (AVIRIS) data. Atmospheric characterization is obtained using solar extinction measurements, surface-level atmospheric pressure readings, and columnar gaseous absorber amounts at sensor overpass. The measured radiances are transferred to the top of the atmosphere using a radiative transfer code which fully computes the contributions of multiple scattering by the atmosphere. The results are compared to those obtained form a laboratory-based calibration of AVIRIS.

Paper Details

Date Published: 27 January 1997
PDF: 12 pages
Proc. SPIE 2957, Advanced and Next-Generation Satellites II, (27 January 1997); doi: 10.1117/12.265452
Show Author Affiliations
Robert John Parada Jr., Optical Sciences Ctr./Univ. of Arizona (United States)
Kurtis J. Thome, Optical Sciences Ctr./Univ. of Arizona (United States)
Richard P. Santer, Univ. du Littoral (France)

Published in SPIE Proceedings Vol. 2957:
Advanced and Next-Generation Satellites II
Hiroyuki Fujisada; Guido Calamai; Martin N. Sweeting, Editor(s)

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