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The Cause of the Hot Spot in Vegetation Canopies and Soils: Shadow-Hiding Versus Coherent BackscatterTwo different mechanisms, shadow-hiding and coherent backscatter, can cause a hot spot, or opposition effect, in the bidirectional reflectance of vegetation and soils. Because the two mechanisms sample different properties, it is important to know which one is primarily responsible in a given medium. This question can be answered by measuring the bidirectional reflectance in circularly polarized light. If the results of the limited experiments reported here can be extrapolated to a wider range of materials, it appears that the primary cause of the hot spot in most vegetation canopies and in moist, clumpy soils is shadow-hiding. However, in vegetation with large numbers of wavelength-sized structures, such as mosses, and in dry, fine-grained soils, the hot spot is dominated by coherent backscatter.
Document ID
19970021464
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1016/0034-4257(95)00257-X
Authors
Hapke, Bruce (Pittsburgh Univ. Pittsburgh, PA United States)
DiMucci, Dominick (Pittsburgh Univ. Pittsburgh, PA United States)
Nelson, Robert (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Smythe, William (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1996
Publication Information
Publication: Remote Sens. Environ.
Publisher: Elsevier Science Inc.
Volume: 58
ISSN: 0034-4257
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NASA-CR-204546
NAS 1.26:204546
ISSN: 0034-4257
Report Number: NASA-CR-204546
Report Number: NAS 1.26:204546
Accession Number
97N22435
Distribution Limits
Public
Copyright
Public Use Permitted.

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