. 2018 Jun 28;18(7):2083. doi: 10.3390/s18072083

Table 2.

Most commonly used canopy reflectance vegetation indices for monitoring crop N status. NIR: Near Infrared; FRed: Far red; L: soil brightness correction factor.

Index	Acronym	Equation	Author
Normalized Difference Vegetation Index	NDVI	$\frac{N I R - R e d}{N I R + R e d}$	Sellers [88]
Green Normalized Difference Vegetation Index	GNDVI	$\frac{N I R - G r e e n}{N I R + G r e e n}$	Ma et al. [90]
Red Ratio of Vegetation Index	RVI	$\frac{N I R}{R e d}$	Birth and McVey [91]
Green Ratio of Vegetation Index	GVI	$\frac{N I R}{G r e e n}$	Birth and McVey [91]
Chlorophyll Index	CI	$\frac{N I R}{R e d} - 1$	Gitelson et al. [92]
Chlorophyll Vegetation Index	CVI	$\frac{N I R}{G r e e n} * \frac{R e d}{G r e e n}$	Vincini et al. [93]
Soil Adjusted Vegetation Index	SAVI	$\frac{N I R - R e d}{N I R + R e d + L} * (1 + L)$	Huete [89]
Optimized Soil Adjusted Vegetation Index	OSAVI	$\frac{N I R - R e d}{N I R + R e d + 0.16}$	Rondeaux et al. [94]
Red Edge Normalized Difference Vegetation Index	RENDVI	$\frac{N I R - R e d E d g e}{N I R + R e d E d g e}$	Gitelson and Merzlyak [95]
Canopy Chlorophyll Content Index	CCCI	$\frac{R E N D V I - R E N D V I_{m i n}}{R E N D V I_{m a x} - R E N D V I_{m i n}}$	Barnes et al. [96]
Red Edge Index	REI	$\frac{N I R}{R e d E d g e}$	Vogelmann et al. [97]
Ratio RENDVI/NDVI	RENDVI/NDVI	$\frac{R E N D V I}{N D V I}$	Varco et al. [98]
MERIS Terrestrial Chlorophyll Index	MTCI	$\frac{N I R - R e d E d g e}{R e d E d g e - R e d}$	Dash and Curran [99]