期刊
REMOTE SENSING
卷 13, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/rs13081535
关键词
forest canopy height; ICESat-2; GEE; stacking algorithm; plantations
类别
资金
- National Natural Science Foundation of China [31971578]
- Scientific Research Fund of Hunan Provincial Education Department [17A225]
- National Bureau to Combat Desertification, State Forestry Administration of China [101-9899]
- Forestry Administration of Hunan Province [XLK201986]
This study utilized a stacking algorithm to accurately map the canopy height of vegetation in the Saihanba Mechanical Forest Plantation, achieving the best prediction accuracy compared to other algorithms used. The stacking approach decreased the RMSE significantly, indicating its effectiveness in predicting forest canopy height.
The forest canopy height (FCH) plays a critical role in forest quality evaluation and resource management. The accurate and rapid estimation and mapping of the regional forest canopy height is crucial for understanding vegetation growth processes and the internal structure of the ecosystem. A stacking algorithm consisting of multiple linear regression (MLR), support vector machine (SVM), k-nearest neighbor (kNN), and random forest (RF) was used in this paper and demonstrated optimal performance in predicting the forest canopy height by synergizing Sentinel-2 images acquired from the cloud-based computation platform Google Earth Engine (GEE) with data from ICESat-2 (Ice, Cloud, and Land Elevation Satellite-2). This research was conducted to achieve continuous mapping of the canopy height of plantations in Saihanba Mechanical Forest Plantation, which is located in Chengde City, northern Hebei province, China. The results show that stacking achieved the best prediction accuracy for the forest canopy height, with an R-2 of 0.77 and a root mean square error (RMSE) of 1.96 m. Compared with MLR, SVM, kNN, and RF, the RMSE obtained by stacking was reduced by 25.2%, 24.9%, 22.8%, and 18.7%, respectively. Since Sentinel-2 images and ICESat-2 data are publicly available, this opens the door for the accurate mapping of the continuous distribution of the forest canopy height globally in the future.
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