Table 1 Spectral reflectance indices

RNDVI

Red normalized difference vegetation index

Green area, photosynthetic capacity, N status

VI

[x(780) − x(670)]/[x(780) + x(670)]

GNDVI

Green normalized difference vegetation index

Green area, photosynthetic capacity, N status

VI

[x(780) − x(550)]/[x(780) + x(550)]/

SRa

Simple ratio

Green biomass

VI

[x(800)/]/[x(680)] and [x(900)]/[x(680)]

RARSa

Ratio analysis of reflectance spectra chlorophyll a

Chlorophyll a content

PI

[x(675)]/[x(700)]

RARSb

Ratio analysis of reflectance spectra chlorophyll b

Chlorophyll b content

PI

[x(675)]/[x(650) × x(700)]

RARSc

Ratio analysis of reflectance spectra chlorophyll c

Chlorophyll c content

PI

[x(760)]/[x(500)]

NPQI

Normalized pheophytinization index

Normal chlorophyll degradation; can be used to estimate phenology, pest and diseases

PI

[x(415) − x(435)]/[x(415) + x(435)]

PRI

Photochemical reflectance index

Dissipation of excess radiation

PI

[x(531) − x(570)]/[x(531) + x(570)]