VIs

Estimated N% = a (measured N%) + b

R²

RMSE (%)

NDVI

0.7265x + 0.3464

0.67

0.168

NDVI_{red edge}

1.026x + 0.0815

0.84

0.148

EVI₂

0.8167x + 0.2694

0.78

0.165

SR_{red edge}

1.0419x + 0.0799

0.84

0.179

CI_green

1.2495x − 0.1527

0.84

0.196

CI_{red edge}

1.0417x + 0.08

0.84

0.179

MTCI

0.7932x + 0.3497

0.84

0.160

RTVI_core

0.8434x + 0.2811

0.84

0.147