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Effect of leaf variables on visible, near-infrared and mid-infrared reflectance of excised leavesEffects of an imposed (excised) leaf orientation, differing species and differing venation patterns on reflectance measurements in the LANDSAT-4 thematic mapper (TM) channels TM3 (0.63 to 0.69 microns), TM4 (0.76 to 0.90 microns), and TM5 (1.55 to 1.75 microns) were investigated. Orientation of leaves (random vs. systematic placement) was found to affect measurements in the TM4 channel, but not the TM3 and TM5 measurements. Venation caused no significant changes for any band. Azimuth of incident radiation was not a significant main effect, but in conjunction with changes in orientation, angle did have a significant effect on reflectance values in TM3, TM4 and TM5. Specific differences were highly significant (P f or = 0.006) in all but one borderline (P F or = 0.0222) case for TM5. For spectral examination of excised leaves, the sampling arrangement of the leaves should as closely approximate in situ positioning as possible (with respect to remote sensing instrumentation). This dictates a random rather than aligned arrangement.
Document ID
19830026138
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Bell, R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Labovitz, M. L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ludwig, R. W. (Maryland Univ.)
Date Acquired
September 4, 2013
Publication Date
July 1, 1983
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NAS 1.15:85076
E83-10424
NASA-TM-85076
Accession Number
83N34409
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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