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Evaluation and interpretation of Thematic Mapper ratios in equations for estimating corn growth parametersReflectance and agronomic Thematic Mapper (TM) data were analyzed to determine possible data transformations for evaluating several plant parameters of corn. Three transformation forms were used: the ratio of two TM bands, logarithms of two-band ratios, and normalized differences of two bands. Normalized differences and logarithms of two-band ratios responsed similarly in the equations for estimating the plant growth parameters evaluated in this study. Two-term equations were required to obtain the maximum predictability of percent ground cover, canopy moisture content, and total wet phytomass. Standard error of estimate values were 15-26 percent lower for two-term estimates of these parameters than for one-term estimates. The terms log(TM4/TM2) and (TM4/TM5) produced the maximum predictability for leaf area and dry green leaf weight, respectively. The middle infrared bands TM5 and TM7 are essential for maximizing predictability for all measured plant parameters except leaf area index. The estimating models were evaluated over bare soil to discriminate between equations which are statistically similar. Qualitative interpretations of the resulting prediction equations are consistent with general agronomic and remote sensing theory.
Document ID
19860034454
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dardner, B. R.
(Nebraska Univ. Lincoln, NE, United States)
Blad, B. L.
(Nebraska Univ. Lincoln, NE, United States)
Thompson, D. R.
(Nebraska Univ. Lincoln, NE, United States)
Henderson, K. E.
(NASA Johnson Space Center Houston, TX; Nebraska, University, Lincoln, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1985
Publication Information
Publication: Remote Sensing of Environment
Volume: 18
ISSN: 0034-4257
Subject Category
Earth Resources And Remote Sensing
Accession Number
86A19192
Distribution Limits
Public
Copyright
Other

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