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Table 2 Definition of current VIs

From: Applying spectral fractal dimension index to predict the SPAD value of rice leaves under bacterial blight disease stress

VIs

Definition or equation

References

GNDVI

\(\left( {{\text{R}}_{800} - {\text{R}}_{550} } \right)/\left( {{\text{R}}_{800} + {\text{R}}_{550} } \right)\)

[45]

MCARI

\(\left[ {\left( {{\text{R}}_{700} - {\text{R}}_{670} } \right) - 0.2\left( {{\text{R}}_{700} - {\text{R}}_{550} } \right)} \right]\left( {{\text{R}}_{700} /{\text{R}}_{670} } \right)\)

PSRI

\(\left( {{\text{R}}_{680} - {\text{R}}_{500} } \right)/{\text{R}}_{750}\)

[46]

VOG1

\({\text{R}}_{740} /{\text{R}}_{720}\)

[47]

VOG2

\(\left( {{\text{R}}_{737} - {\text{R}}_{747} } \right)/\left( {{\text{R}}_{715} + {\text{R}}_{726} } \right)\)

VOG3

\(\left( {{\text{R}}_{737} - {\text{R}}_{747} } \right)/\left( {{\text{R}}_{715} + {\text{R}}_{720} } \right)\)

MSAVI

\(\frac{1}{2} \times \left[ {\left( {2{\text{R}}_{{{\text{Nir}}}} + 1} \right) - \sqrt {\left( {2{\text{R}}_{{{\text{Nir}}}} + 1} \right)^{2} - 8\left( {{\text{R}}_{{{\text{Nir}}}} - {\text{R}}_{{{\text{Red}}}} } \right)} } \right]\)

[48]

NDVI

\(\left( {{\text{R}}_{800} - {\text{R}}_{670} } \right)/\left( {{\text{R}}_{800} + {\text{R}}_{670} } \right)\)

[49]

PRI

\(\left( {{\text{R}}_{570} - {\text{R}}_{531} } \right)/\left( {{\text{R}}_{570} + {\text{R}}_{531} } \right)\)

NPCI

\(\left( {{\text{R}}_{680} - {\text{R}}_{430} } \right)/\left( {{\text{R}}_{680} + {\text{R}}_{430} } \right)\)

[50]

MTCI

\(\left( {{\text{R}}_{754} - {\text{R}}_{709} } \right)/\left( {{\text{R}}_{709} - {\text{R}}_{681} } \right)\)

[51]

RVI

\({\text{R}}_{{{\text{Nir}}}} /{\text{R}}_{{{\text{Red}}}}\)

[52]

NDI

\(\left( {{\text{R}}_{800} - {\text{R}}_{680} } \right)/\left( {{\text{R}}_{800} + {\text{R}}_{680} } \right)\)

[53]

SAVI

\(1.5 \times \left( {{\text{R}}_{800} - {\text{R}}_{670} } \right)/\left( {{\text{R}}_{800} + {\text{R}}_{670} + 0.5} \right)\)

[54]

VARIgreen

\(\left( {{\text{R}}_{560} - {\text{R}}_{670} } \right)/\left( {{\text{R}}_{560} + {\text{R}}_{670} - {\text{R}}_{450} } \right)\)

[55]

VARIred

\(\left( {{\text{R}}_{700} - 1.7{\text{R}}_{670} + 0.7{\text{R}}_{450} } \right)/\left( {{\text{R}}_{700} + 2.3{\text{R}}_{670} - 1.3{\text{R}}_{450} } \right)\)

  1. \({\text{R}}_{800}\): spectral reflection intensity at 800 nm, the same goes for \({\text{R}}_{754}\), \({\text{R}}_{680}\), \({\text{R}}_{450}\), and so on
  2. \({\text{R}}_{{{\text{Nir}}}}\): mean reflection intensity between 760 and 850 nm
  3. \({\text{R}}_{{{\text{Red}}}}\): mean reflection intensity between 650 and 670 nm
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Plant Methods

ISSN: 1746-4811