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Response of Thematic Mapper bands to plant water stressChanges in leaf reflectance as water content decreases have been hypothesized to occur in the 1.55-1.75 and 2.08-2.35 micron wavelength regions. To evaluate this hypothesis, studies were conducted on ryegrass (Lolium multiflorum Lam.) and oats (Avena sativa L.), which were grown in a controlled, outdoor situation. Both fully-watered control beds and water-stressed beds were periodically examined with a spectroradiometer calibrated against a reflectance reference of polytetrafluoroethylene. The observed changes correspond to those predicted by stochastic leaf models employed by other investigators (leaf reflection increases in the 1.55-1.75 micron region as leaf water content decreases). Although the percentage changes in TM bands 1-3 are nearly as great as those found in TM bands 5 and 7, the absolute values of reflectance change are much lower. It is believed that these patterns are probably characteristic of a broad range of vegetation types. In terms of phenomena detection, these patterns should be considered in any practical remote sensing sensor scenario.
Document ID
Document Type
Reprint (Version printed in journal)
Cibula, W. G.
(NASA John C. Stennis Space Center Bay Saint Louis, MS, United States)
Zetka, E. F.
(NASA John C. Stennis Space Center Bay Saint Louis, MS, United States)
Rickman, D. L.
(NASA Stennis Space Center Bay Saint Louis, MS, United States)
Date Acquired
August 15, 2013
Publication Date
July 10, 1992
Publication Information
Publication: International Journal of Remote Sensing
Volume: 13
Issue: 10, J
ISSN: 0143-1161
Subject Category
Earth Resources And Remote Sensing
Accession Number
Distribution Limits

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