The Effect of Principal Component Analysis Parameters on Solar-Induced Chlorophyll Fluorescence Signal Extraction
Abstract
:1. Introduction
2. Materials and Methods
2.1. Research Region
2.2. Method
- (1)
- Training sample selection: We first select red and near-infrared band regions to calculate the normalized difference vegetation index (NDVI). Then, this study uses 0.1 as the NDVI threshold to extract non-vegetation pixels in the whole image and extracts the corresponding radiance spectra as input samples for PCA.
- (2)
- Conduct two control variate experiments:
2.3. Evaluation
3. Results
3.1. The Analysis of the Principal Component Numbers
3.2. The Analysis of the Spectral Band Regions
3.3. Verification
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Applications | Variables | References |
---|---|---|
Photosynthesis estimation | Absorbed photosynthetic active radiation | [17,18] |
Gross primary productivity | [15,16] | |
Light use efficiency | [14,17,19] | |
Seasonal dynamics | [17,20,21] | |
Vegetation type | [22,23] | |
Chlorophyll content | [24,25] | |
Stress detection | Water deficit or drought | [27] |
Nitrogen deficit | [26] | |
Heat | [28] | |
Creative applications | Extreme accidents | [30,31,32] |
Temperature of canopy | [29] |
Hyperspectral Data | |
---|---|
Study area | Danzhou, Hainan Province, China |
Spatial resolution | 1 m × 1 m |
Spectral resolution | 0.11 nm |
Spectral band number | 1004 |
Spectral regions | 669.84 nm~780.32 nm |
Acquiring time | 25 May 2020 |
Data format | BIL |
Data unit | Radiance (mW/cm2·str·um) × 1000.00 |
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Sun, Z.; Yang, S.; Shi, S.; Yang, J. The Effect of Principal Component Analysis Parameters on Solar-Induced Chlorophyll Fluorescence Signal Extraction. Appl. Sci. 2021, 11, 4883. https://doi.org/10.3390/app11114883
Sun Z, Yang S, Shi S, Yang J. The Effect of Principal Component Analysis Parameters on Solar-Induced Chlorophyll Fluorescence Signal Extraction. Applied Sciences. 2021; 11(11):4883. https://doi.org/10.3390/app11114883
Chicago/Turabian StyleSun, Zhongqiu, Songxi Yang, Shuo Shi, and Jian Yang. 2021. "The Effect of Principal Component Analysis Parameters on Solar-Induced Chlorophyll Fluorescence Signal Extraction" Applied Sciences 11, no. 11: 4883. https://doi.org/10.3390/app11114883