Extraction of rocky desertification information based on multi-feature combination optimization and random forest algorithm: A case study of Zhaotong city in Yunnan province
LIU Zicheng1, CHEN Guokun1,2,3, WEN Qingke3, YI Ling3, ZHAO Jingjing1
1. Faculty of Land Resource Engineering, Kunming University of Science and Technology, 650093, Kunming, China; 2. Key Laboratory of Plateau Remote Sensing, Yunnan Provincial Department of Education, 650093, Kunming, China; 3. Aerospace Information Research Institute, Chinese Academy of Sciences, 100101, Beijing, China
Abstract：[Background] Rocky desertification is one of the most important geo-ecological disasters in southwestern China. It causes land resources loss, ecosystem degradation, drought and water shortage, which seriously threatens the ecological balance, food security and the absence of large-scale return to poverty in southwest China. Accurate extraction of rock desertification information is crucial to the sustainable development of regional economy and society. [Methods] Aiming at the problems such as single temporal phase, poor timeliness and low accuracy of regional scale extraction results in the current rocky desertification information extraction, this study took Zhaotong city of Yunnan as an example by proposing an optimized classification method incorporating multi-features. Based on the preferential selection of samples and features, the multiple features such as spectra, indices, fractional vegetation cover, bedrock exposure rate, texture and topography were extracted using Sentinel-2 imagery and DEM data, and five classification schemes were constructed, as well as the extraction was completed using the random forest classification algorithm. [Results] 1) When the Jeffries-Matusita (JM) distance algorithm was applied to evaluate separability of input features, the input features with the maximum average JM distance were BSI and Albedo, followed by TF1 and slope, and the input features with the minimum average JM distance were B6 and B8. For rocky desertification land and other land cover types, slope, TF1, BSI and Albedo had JM distance greater than 1.9, indicating a significant effect on the classification accuracy. 2) The importance of all input features was analyzed by the forest classification algorithm. The slope feature contributed the most to the classification accuracy, followed by the texture feature TF1, NDVI and BSI, and the contribution of B4 and B6 bands in the spectral feature was relatively small. 3) In the case of the same number and distribution of sample points, compared with the other four classification schemes, the overall accuracy (OA) of the feature selection scheme obtained by using JM distance was 88.0%, and the Kappa coefficient was 0.85. The producer accuracy (PA) and user accuracy (UA) of rocky desertification land reached 91.2% and 83.8%, respectively. Finally, the rocky desertification land area of Zhaotong in 2020 was 2 820 km2, accounting for 11.11% of the total land area of the region. The classification results were also in good agreement with the field survey area. [Conclusions] In this study, the input samples and characteristics are optimized by combining land use and land cover data and JM distance algorithm respectively, which effectively improves the phenomenon of misclassification, omission and large error in the fractured area of rocky desertification distribution in plateau mountainous areas. By the method proposed in this study, high classification accuracy at regional scale can be achieved, which provides reference for relevant departments to carry out rocky desertification prevention and monitoring.
刘字呈, 陈国坤, 温庆可, 易玲, 赵晶晶. 基于多特征组合优选与随机森林算法的石漠化信息提取——以云南省昭通市为例[J]. 中国水土保持科学, 2024, 22(1): 95-105.
LIU Zicheng, CHEN Guokun, WEN Qingke, YI Ling, ZHAO Jingjing. Extraction of rocky desertification information based on multi-feature combination optimization and random forest algorithm: A case study of Zhaotong city in Yunnan province. SSWC, 2024, 22(1): 95-105.
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2024, Vol. 22 
