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A forester's look at the application of image manipulation techniques to multitemporal Landsat dataRegistered, multitemporal Landsat data of a study area in central Pennsylvania were analyzed to detect and assess changes in the forest canopy resulting from insect defoliation. Images taken July 19, 1976, and June 27, 1977, were chosen specifically to represent forest canopy conditions before and after defoliation, respectively. Several image manipulation and data transformation techniques, developed primarily for estimating agricultural and rangeland standing green biomass, were applied to these data. The applicability of each technique for estimating the severity of forest canopy defoliation was then evaluated. All techniques tested had highly correlated results. In all cases, heavy defoliation was discriminated from healthy forest. Areas of moderate defoliation were confused with healthy forest on northwest (NW) aspects, but were distinct from healthy forest conditions on southeast (SE)-facing slopes.
Document ID
19800041426
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Williams, D. L.
(NASA Goddard Space Flight Center Earth Resources Branch, Greenbelt, Md., United States)
Stauffer, M. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Leung, K. C.
(Computer Sciences Corp. Silver Spring, Md., United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1979
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: Machine processing of remotely sensed data
Location: West Lafayette, IN
Start Date: June 27, 1979
End Date: June 29, 1979
Accession Number
80A25596
Distribution Limits
Public
Copyright
Other

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