Comparison of Different Vegetative Indices for Calibrating Proximal Canopy Sensors to Grapevine Pruning Weight

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Figure 1
Plot of the mean rank versus the standard deviation of rank for each vegetation index (VI). PC1 refers to the first principal component from a PCA of all seven VIs in Table 1. NDRE, normalized difference red edge; DifVI, simplified difference vegetation index; RECI, red-edge chlorophyll index; NDVI, normalized difference vegetation index; MSR, modified simple ratio; MTCI, MERIS terrestrial chlorophyll index; PCD/SR, Plant Cell Density or Simple Ratio.

Table 1
Vegetative indices, their abbreviation, formula, and original citation used in this study.
Table 2
Counts of the rank assigned for each vegetative index (VI) (n = 27 vineyards) and the mean adjusted coefficient of regression (R²_adj) value for each VI when regressed against vine pruning weight in each individual vineyard. PC1, first principal component; NDRE, normalized difference red edge; DifVI, simplified difference vegetation index; RECI, red-edge chlorophyll index; NDVI, normalized difference vegetation index; MSR, modified simple ratio; MTCI, MERIS terrestrial chlorophyll index; PCD/SR, Plant Cell Density or Simple Ratio.

Vol 72 Issue 3