Research Article
Improving QGA-ELM Inversion Model of Rice Leaf Area Index Based on UAV Remote Sensing Image
Table 3
Spectral index for rice LAI inversion.
| | Object | Formula | Provenance |
| | Ratio vegetation index (RVI) | | Pearson et al. (1972) | | Normalized vegetation index (NDVI) | | Rouse et al. (1974) | | Green normalized vegetation index (GNDVI) | | Gitelson et al. (1996) | | Optimizing soil regulation vegetation index (NPCI) | | Schleicher et al. (1994) | | Nitrogen balance index (NRI) | | Penuelas J, et al. (2001) | | Approximate red edge position index (s-REP) | | This article |
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Note: ρNIR,ρR,ρG, and ρB represent the reflectivity of the rice canopy near infrared, red, green, and blue bands, respectively.
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