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Proceedings Paper

Snow BRDF effects on vicarious and cross calibrations of ASTER
Author(s): Satoshi Tsuchida
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Paper Abstract

A snowfield is a candidate as a target for vicarious and cross calibrations of Advanced Spaceborne Thermal Emission and Reflection (ASTER) radiometer. In previous our studies, the uncertainties of snowfields for these calibrations were estimated, and the field experiments for a vicarious calibration over the snowfield have been carried out using Landsat TM data. These studies show the enough potential of a snowfield as a target for in-flight radiometric calibrations but also the problem for snow bidirectional reflectance distribution (BRDF) effects. The snow surface was assumed to be Lambertian in previous studies. However, the snow surface shows departure from Lambertian behavior and high reflectance, therefore the multiple scattering between atmosphere and non- Lambertian snow surface can not be ignored. In this study, snow BRDF and atmospheric radiative transfer are simulated using doubling-adding method that has a potential to calculate multiple scattering between non-Lambertian surface and atmosphere, and then the snow BRDF effects on these calibrations are estimated. The result shows that the radiative transfer code that account the multiple scattering between surface and atmosphere is necessary for the ASTER in- flight radiometric calibrations over the snowfield in the cases of the large angle solar zenith angle, large snow particle size and etc.

Paper Details

Date Published: 21 December 1998
PDF: 7 pages
Proc. SPIE 3498, Sensors, Systems, and Next-Generation Satellites II, (21 December 1998); doi: 10.1117/12.333650
Show Author Affiliations
Satoshi Tsuchida, Geological Survey of Japan (Japan)


Published in SPIE Proceedings Vol. 3498:
Sensors, Systems, and Next-Generation Satellites II
Hiroyuki Fujisada, Editor(s)

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