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Estimation of vegetation cover at subpixel resolution using LANDSAT dataThe present report summarizes the various approaches relevant to estimating canopy cover at subpixel resolution. The approaches are based on physical models of radiative transfer in non-homogeneous canopies and on empirical methods. The effects of vegetation shadows and topography are examined. Simple versions of the model are tested, using the Taos, New Mexico Study Area database. Emphasis has been placed on using relatively simple models requiring only one or two bands. Although most methods require some degree of ground truth, a two-band method is investigated whereby the percent cover can be estimated without ground truth by examining the limits of the data space. Future work is proposed which will incorporate additional surface parameters into the canopy cover algorithm, such as topography, leaf area, or shadows. The method involves deriving a probability density function for the percent canopy cover based on the joint probability density function of the observed radiances.
Document ID
19870006081
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Jasinski, Michael F. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Eagleson, Peter S. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Date Acquired
September 5, 2013
Publication Date
November 1, 1986
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NASA-CR-177077
NAS 1.26:177077
Accession Number
87N15514
Funding Number(s)
CONTRACT_GRANT: NAG5-510
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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