Table 3 Average correlations in cross-validation of vegetative indexes
From: Bayesian modelling of phosphorus content in wheat grain using hyperspectral reflectance data
Index | Expression | Year | ||
|---|---|---|---|---|
2010 | 2011 | 2012 | ||
Simple Ratio [4] | \(\frac{{R}_{800-900}}{{R}_{650-700}}\) | 0.338 | 0.738 | 0.666 |
Normalized difference vegetation index [5] | \(\frac{{R}_{800}-{R}_{680}}{{R}_{800}+{R}_{680}}\) | 0.356 | 0.685 | 0.527 |
Green normalized difference vegetation index [11] | \(\frac{{R}_{800-900}-{R}_{540-560}}{{R}_{800-900}+{R}_{540-560}}\) | 0.443 | 0.674 | 0.687 |
Soil adjusted vegetation index [12] | \(\frac{1.5 {R}_{800-900}-{R}_{650-700}}{{R}_{800-900}+{R}_{650-700}+0.5}\) | 0.353 | 0.692 | 0.530 |
Optimized soil adjusted vegetation index [19] | \(\frac{{1.16R_{800} - R_{670} }}{{R_{800} + R_{670} + 0.16}}\) | 0.352 | 0.671 | 0.566 |
CAR model avg | 0.601 | 0.680 | 0.823 | |