Table 1.
Published spectral indices tested in this study.
| Define | Formula | Related to | Reference |
|---|---|---|---|
| Structural Independent Pigment Index, SIPI | (R800 − R445)/(R800 − R680) | Pigment content | [4,29] |
| Photochemical Reflectance Index, PRI | (R570 − R531)/(R570 + R531) | Photosynthetic radiation | [30,31] |
| Transformed Chlorophyll Absorption in Reflectance Index, TCARI | 3((R700 − R675) − 0.2(R700 − R500)/(R700/R670)) | Chlorophyll a + b concentration | [32] |
| Normalized difference vegetation index, NDVI | (R830 − R675)/(R830 + R675) | Leaf area index; photosynthetically active radiation (PAR) or biomass (PAB) |
[16] |
| Normalized Pigment Chlorophyll Index, NPCI | (R680 − R430)/(R680 + R430) | Chlorophyll ratio | [4] |
| Plant senescence reflectance index, PSRI | (R680 − R500)/R750 | Pigment content; leaf senescence and ripening | [17] |
| Physiological Reflectance Index, PhRI | (R550 − R531)/(R550 + R531) | Light use efficiency | [30] |
| Anthocyanin Reflectance Index, ARI | (R550)−1 − (R700)−1 | Anthocyanin content | [10,33] |
| Modified Simple Ratio, MSR | (R800/R670 − 1)/sqrt(R800/R670 + 1) | Leaf area | [34] |
| Ratio Vegetation Structure Index, RVSI | (R712 + R752)/2) − R732 | Internal structure parameter | [35] |
| Modified Chlorophyll Absorption Reflectance index, MCARI | ((R701 − R671) − 0.2(R701 − R549))/(R701/R671) | Chlorophyll absorption | [36] |
| Yellow rust index, YRI | (R730 − R419)/(R730 + R419) + 0.5R736 | Wheat disease | [31] |
| Greenness index, GI | R554/R677 | Pigment content | [37] |
| Triangular vegetation index, TVI | 0.5(120(R750 − R550) − 200((R670 − R550)) | Plant status | [38] |
| Nitrogen reflectance index, NRI | (R570 − R670)/(R570 + R670) | Nitrogen status | [39] |