Sentinel-2 Images Based Modeling of Grassland Above-Ground Biomass Using Random Forest Algorithm: A Case Study on the Tibetan Plateau
Abstract
:1. Introduction
2. Dataset
2.1. Study Area
2.2. Field Data
2.3. Elevation Dataset
2.4. Meteorological Data
2.5. S2 Bands and S2-Derived VIs
3. Methodology
3.1. AGB Estimation Procedure
3.2. Recursive Feature Elimination
3.3. Feature Importance
3.4. Cubist
3.5. GBRT
3.6. RF
3.7. XGBoost
3.8. Estimation Accuracy Evaluation
4. Results and Discussion
4.1. Spatial Distribution Grassland AGB from All the Sampling Plots
4.2. Feature Importance
4.3. Performance of Feature Selection
4.4. Evaluation of AGB Models
4.5. Advantages of S2 Images and S2-Derived VIs in Estimating Grassland AGB
4.6. Influence of Features on Grassland AGB
4.7. Limitations and Future Works
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sentinel-2 Bands | Central Wavelength (µm) | Resolution (m) | Wavelength S2A/S2B (nm) |
---|---|---|---|
B2—Blue | 0.490 | 10 | 496.6/492.1 |
B3—Green | 0.560 | 10 | 560/559 |
B4—Red | 0.665 | 10 | 664.5/665 |
B5—Red Edge 1 | 0.705 | 20 | 703.9/703.8 |
B6—Red Edge 2 | 0.740 | 20 | 740.2/739.1 |
B7—Red Edge 3 | 0.783 | 20 | 782.5/779.7 |
B8—NIR | 0.842 | 10 | 835.1/833 |
B8A—Narrow NIR | 0.865 | 20 | 864.8/864 |
B11—SWIR 1 | 1.610 | 20 | 1613.7/1610.4 |
B12—SWIR 2 | 2.190 | 20 | 2202.4/2185.7 |
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Fan, X.; He, G.; Zhang, W.; Long, T.; Zhang, X.; Wang, G.; Sun, G.; Zhou, H.; Shang, Z.; Tian, D.; et al. Sentinel-2 Images Based Modeling of Grassland Above-Ground Biomass Using Random Forest Algorithm: A Case Study on the Tibetan Plateau. Remote Sens. 2022, 14, 5321. https://doi.org/10.3390/rs14215321
Fan X, He G, Zhang W, Long T, Zhang X, Wang G, Sun G, Zhou H, Shang Z, Tian D, et al. Sentinel-2 Images Based Modeling of Grassland Above-Ground Biomass Using Random Forest Algorithm: A Case Study on the Tibetan Plateau. Remote Sensing. 2022; 14(21):5321. https://doi.org/10.3390/rs14215321
Chicago/Turabian StyleFan, Xinyue, Guojin He, Wenyi Zhang, Tengfei Long, Xiaomei Zhang, Guizhou Wang, Geng Sun, Huakun Zhou, Zhanhuan Shang, Dashuan Tian, and et al. 2022. "Sentinel-2 Images Based Modeling of Grassland Above-Ground Biomass Using Random Forest Algorithm: A Case Study on the Tibetan Plateau" Remote Sensing 14, no. 21: 5321. https://doi.org/10.3390/rs14215321