Table 4 Calculated vegetation indices for each cameras, based on their spectral bands and correlation between vegetation index values extracted from UAS imagery and band equivalent reflectance values from Spectroradiometer

NDVI

\(\frac{NIR - Red}{NIR + Red}\)

–

0.33

GNDVI

\(\frac{NIR - Green}{NIR + Green}\)

0.68

0.63

RENDVI

\(\frac{NIR - Red\_edge}{NIR + Red\_edge}\)

–

0.64

ENDVI

\(\frac{NIR + Green - 2*Blue}{NIR + Green + 2*Blue}\)

0.54

–

GIPVI

\(\frac{NIR }{NIR + Green}\)

0.59

–