Table 1 Mathematical expressions of various vegetation indexes.

From: Wheat growth monitoring and yield estimation based on remote sensing data assimilation into the SAFY crop growth model

Vegetation indices

Equation

References

EVI

\({\text{EVI}} = 2.5\frac{{{\text{NIR}} - R}}{{{\text{NIR}} + 6R - 7.5B + 1}}\)

53

EVI2

\({\text{EVI2}} = 2.5\frac{{{\text{NIR}} - R}}{{{\text{NIR}} + 2.4R + 1}}\)

54

MSR

\({\text{MSR}} = \frac{{{\text{NIR}}/R - 1}}{{\sqrt {{\text{NIR}}/R} + 1}}\)

55

NDVI

\({\text{NDVI}} = \frac{{{\text{NIR}} - R}}{{{\text{NIR}} + R}}\)

56

OSAVI

\({\text{OSAVI}} = \frac{{{\text{NIR}} - R}}{{{\text{NIR}} + R + 0.16}}\)

57

RVI

\({\text{RVI}} = \frac{{{\text{NIR}}}}{R}\)

58

  1. R, G, B and NIR represent the reflectance of red, green, blue and near-infrared bands respectively.
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