砂金开采带来了严重的环境地质问题,开展砂金矿区环境地质调查研究对于砂金矿区环境评价、监管和治理等具有重要的意义.文章以东北珲春河中游砂金矿区为研究区,基于"高分二号"(GF-2)卫星遥感影像,采用监督分类和人工修正后处理的方法开展了矿区环境地质要素提取研究.以野外实地调查修正收集的矿区环境地质要素成果作为参考数据,对提取精度进行评价,将提取结果和参考数据进行对比分析发现,尾矿堆和采矿坑的提取总精度达到95％.分析结果表明GF-2卫星影像对砂金矿区环境地质要素具有较好的识别能力,能够满足矿区环境地质调查的需求.%The gold placer mining brings serious environmental geological problems. Environmental geology investigation in gold placer-mining areas is of great significance for the assessment, regulation, and governance of environment in those areas. In the present study, taking a gold placer-mining area in the middle reaches of the Hunchun River of Northeast China as the study area, the feasibility of extracting environmental geological elements was examined using GF-2 imagery. In the study, the supervised classification algorithm and the post-classification method based on manual correction were adopted. Base on field survey, the collected data of environmental geological elements were corrected. The resulted reference data were used to assess the extraction accuracy. Results showed that GF-2 imagery exhibited great capacity of identifying environmental geological elements in gold placer-mining area, and it could meet the requirement of environmental geology investigation in mining areas.
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