| タイトル | Evaluation and interpretation of Thematic Mapper ratios in equations for estimating corn growth parameters |
| 著者（英） | Blad, B. L.; Dardner, B. R.; Thompson, D. R.; Henderson, K. E. |
| 著者所属（英） | Nebraska Univ.|NASA Johnson Space Center |
| 発行日 | 1985-12-01 |
| 言語 | eng |
| 内容記述 | Reflectance 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. |
| NASA分類 | EARTH RESOURCES AND REMOTE SENSING |
| レポートNO | 86A19192 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/387153 |
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