Journal
PLANTS-BASEL
Volume 9, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/plants9030368
Keywords
deep belief nets; extreme learning machine; first derivative spectra; random forest; shade-grown tea; support vector machine
Categories
Funding
- JSPS KAKENHI [19K06313]
- Agriculture, Forestry and Fisheries Research Council [19191026]
- Grants-in-Aid for Scientific Research [19K06313] Funding Source: KAKEN
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Tea trees are kept in shaded locations to increase their chlorophyll content, which influences green tea quality. Therefore, monitoring change in chlorophyll content under low light conditions is important for managing tea trees and producing high-quality green tea. Hyperspectral remote sensing is one of the most frequently used methods for estimating chlorophyll content. Numerous studies based on data collected under relatively low-stress conditions and many hyperspectral indices and radiative transfer models show that shade-grown tea performs poorly. The performance of four machine learning algorithms-random forest, support vector machine, deep belief nets, and kernel-based extreme learning machine (KELM)-in evaluating data collected from tea leaves cultivated under different shade treatments was tested. KELM performed best with a root-mean-square error of 8.94 +/- 3.05 mu g cm(-2) and performance to deviation values from 1.70 to 8.04 for the test data. These results suggest that a combination of hyperspectral reflectance and KELM has the potential to trace changes in the chlorophyll content of shaded tea leaves.
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