First-order derivative (FD) is often used to enhance vegetation pigment absorption properties, which are easily disturbed by soil and canopy background effects29. The first-order derivative spectra (FDS) were obtained by calculating each reflectance spectrum using the following formula: $${\text{FDS...
Importantly, the linkage between Lr19 and yellow pigment content was broken in one of the lines. Thus, the Lr19 linked markers and translocation lines developed in this study are valuable resources in marker-assisted selection as part of common wheat breeding programs. This is a preview of ...
Based on the importance score derived from each machine learning method, the features with an importance score greater than the standard deviation of all score values were selected for further modeling. For the first modeling strategy, a total of nine regression models (three machine learning ...
(6) combined with the analysis results inFigure 10, the consistent point between severe drought and mild drought is that the upper leaves of the four varieties of poplar trees still have slightly increased values, and the elevated value in the mild drought group was greater than that in the ...
Non-destructive optical detection of pigment changes during leaf senescence and fruit ripening. Physiol. Plant. 1999, 106, 135–141. [Google Scholar] [CrossRef] [Green Version] Peñuelas, J.; Isla, R.; Filella, I.; Araus, J.L. Visible and Near-Infrared Reflectance Assessment of Salinity...
Furthermore, the Kappa coefficient of the RF model is 0.765, which is 0.059 and 0.412 higher than the values of the BPNN and AdaBoost models, respectively. Thus, the RF model demonstrating the highest overall accuracy and Kappa coefficient, and achieving the highest recognition accuracy. ...
This is due to damage to chloroplasts or other organelles within the leaf caused by the disease and changes in pigment content, resulting in changes in spectral reflectance [51]. The band range between 400 and 450 nm shows severe reflectance overlap, and thus the band range of 450 to 1000 ...
Non-destructive optical detection of pigment changes during leaf senescence and fruit ripening. Physiol. Plant. 1999, 106, 135–141. [Google Scholar] [CrossRef] [Green Version] Peñuelas, J.; Isla, R.; Filella, I.; Araus, J.L. Visible and Near-Infrared Reflectance Assessment of Salinity...
In terms of algorithms, RF performed better than SAM given the same predictor features. As shown in Table 2, the overall accuracies and kappa values based on spectral bands alone were 84.6% and 0.79 with RF, and 71.4% and 0.62 with SAM, respectively. After incorporating NRI, the overall ...
In VIS, the pigment-related spectral region, the effect of MS on reflectance was negligible. The major influence of MS on reflectance was detected in NIR (up to 25%), the structure-related spectral range; and weaker effect in SWIR, the water-related spectral range. Vegetation indices ...