Forest fires are one of the major disasters in China and can cause serious losses to forest resources and the social economy. In this paper, Xichang City, Sichuan Province was used as the study area, and Sentinel 2 data and Landsat 8 data were used to monitor the forest fires and ecological environment of the area dynamically, respectively. Based on the Sentinel 2 data, the overfire area extracted by the normalized fire burn index method is about 825 ha, which is close to the investigated damaged forest area of 791.6 ha. Based on the Landsat8 data, the ecological environment is monitored by the change of RSEI ecological index. The study shows that the use of remote sensing technology can effectively monitor forest fires and ecological environment, which can provide some theoretical basis for the prevention and control of forest fires and ecological restoration.
Remote sensing technology can quickly identify hydro thermal alteration related to mineralization and provide help for prospecting through efficient and accurate analysis. In this study, the Zhaoping fault zone is taken as the research area, Landsat8 OLI remote sensing images with good imaging quality are used as the data source, and ENVI software is used to perform pruning, radiometric calibration, atmospheric correction, and preprocessing of removing interference information including water and vegetation from remote sensing images in 2015 and 2020 respectively. The mineralized alteration information of this area is extracted by CROSTA method, and the extracted thematic information is analyzed and verified. In addition, by comparing the extraction maps of mineralization information in 2015 and 2020, it is found that the situation of over exploitation of mineral resources still exists. The results are in good agreement with the known ore points in the study area, indicating that the extraction of metal mineralization information through remote sensing images is of great significance to the study and rational utilization of mineral resources.
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