VARIABILITY OF THE BARE SOIL ALBEDO DUE TO DIFFERENT SOLAR ZENITH ANGLES AND ATMOSPHERIC HAZINESS

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/27699

Title:	VARIABILITY OF THE BARE SOIL ALBEDO DUE TO DIFFERENT SOLAR ZENITH ANGLES AND ATMOSPHERIC HAZINESS
Authors:	LIU,CH;CHEN,AJ;LIU,GR
Contributors:	太空及遙測研究中心
Keywords:	HEMISPHERICAL REFLECTANCE ALBEDO;BIDIRECTIONAL REFLECTANCE;CANOPY REFLECTANCE;SURFACE;ANISOTROPY;NADIR
Date:	1994
Issue Date:	2010-06-29 18:52:31 (UTC+8)
Publisher:	中央大學
Abstract:	Owing to the non-Lambertian reflection properties of natural surfaces, the bidirectional reflectance factor (BRF) and hence the albedo depend on solar zenith angle (SZ) as well as the haziness of the atmosphere. By using the results of Pinty, Verstraete and Dickinson to describe the BRFs of bare soil in NOAA-7, -8 satellite AVHRR band 1 and 2, and the results of LOWTRAN-7 as the description of hemispherical irradiation, the variation of bare soil albedo and errors inferred from all viewing directions of BRF under changing SZs and aerosol optical depths is discussed. This paper also shows that the optimal view angle of bare soil used to infer the albedo from a single observation under SZ from 25 degrees to 45 degrees, and atmospheric conditions from clear sky to hazy sky, for both AVHRR bands is about 50 degrees off-nadir and about 80 degrees relative azimuthal angle. Their errors are no more than 1 per cent. The sensitivity of optimal view angle with aerosol optical depth is also discussed. This leads to the evaluation of the optimal view angle determined by Kimes and Sellers at different haziness of atmosphere.
Relation:	INTERNATIONAL JOURNAL OF REMOTE SENSING
Appears in Collections:	[Center for Space and Remote Sensing Research ] journal & Dissertation

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