关键词: Landsat系列影像, 石英砂矿区, 时空变化, 支持向量机, 凤阳县

Abstract: The land use information and its change characteristics are studied based on RS and GIS methods of quartz mine area in Fengyang county from 1991 to 2015.The results show that:①Our Landsat satellite image classification algorithm based on SVM is efficient and acquire high classification accuracy for overall accuracy and Kappa coefficient,reaching 94.78% and 0.934 0,respectively.②Significant changes in both land use ways and temporal-spatial pattern have taken place in Fengyang county during the past 25 years.The quartz mine area undergoes a trend of dramatic increase with the fastest speed,from which most of areas are converted from grassland and forestland.The urban construction land increases continuously,from which most of areas are transformed from farmland,grassland and water.The water first decreases and then increases with a lower decreasing ratio.The grassland decreases rapidly with the maximum variation,most of which are converted into forestland,farmland and quartz mine area.The forestland increases 624.33 hm².The farmland which distributes in villages rivers around decreases due to desertification or occupation by the construction land expansion.③The land ecosystem has been deteriorated to a dangerous level over the past 25 years.More specifically,the areas of quartz mine and urban land construction have been both increased significantly.On the contrary,the vegetation and the water regions have been decreased year after year.

Key words: Landsat images, quartz mine, temporal-spatial analysis, SVM, Fengyang county