Table 1 Spectral index calculation formulas.

From: Remote sensing inversion on heavy metal content in salinized soil of Yellow River Delta based on Random Forest Regression—a case study of Gudao Town

Spectral index

Calculation formula

References

NDVI

(NIR − Red)/(NIR + Red)

28

CMR

SWIR1/SWIR2

29

MNDWI

(Green – SWIR1)/(Green + SWIR1)

30

RVI

NIR/Red

31

DVI

NIR − Red

37

MSAVI

\(\left[\left(2{\text{NIR}}+1\right)-\sqrt{({2{\text{NIR}}+1)}^{2}-8({\text{NIR}}-{\text{Red}})}\right]/2\)]

38

EVI

2.5[(NIR − Red)/(NIR + 6Red − 7.5Blue + 1)]

39

RGRI

Red/Green

32

  1. Blue blue band reflectance, Green green band reflectance, Red red band reflectance, NIR near-infrared band reflectance, SWIR1 short-wave infrared 1 reflectance, SWIR2 short-wave infrared 2 reflectance.
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