基于遥感影像的恩施市土地利用/覆被变化研究

Research on Land Use / Cover Change in Enshi City Basedon Remote Sensing Images

以恩施市2003年和2015年的遥感影像为基础,本文利用ENVI5.1将影像分成六大土地利用类型:林地、耕地、草地、建设用地、水域和裸地。同时,采用土地利用/覆被变化幅度、动态度的数学模型和混淆矩阵的分析方法,研究恩施市2003—2015年土地利用/覆被动态变化。结果表明,2003—2015年,恩施市土地利用类型占比最高的为林地和耕地,二者总面积超过恩施市总面积的80%,林地和耕地是土地利用类型变化幅度最大的用地类型;土地利用/覆被变化最剧烈的主要为建设用地、水域和裸地,土地利用变化过程动态度K2分别达到28.43%、16.63%和7.74%;土地利用类型相互转化方面,主要是林地和耕地的转化,其次是草地、裸地向建设用地的转化。

Based on the remote sensing images of Enshi City in 2003 and 2015, this paper used ENVI5.1 to divide the images into six land use types: forest land, cultivated land, grassland, construction land, water area and bare land. At the same time, a dynamic model of land use / cover change amplitude and dynamics and an analysis method of confusion matrix were used to study the dynamic changes of land use / cover in Enshi City from 2003 to 2015. The re sults show that from 2003 to 2015, the highest proportion of land use types in Enshi City was forest land and cultivat ed land, with the total area of both exceeding 80% of the total area of Enshi City, forest land and cultivated land were the types of land with the largest changes in land use types;the most drastic changes in land use / cover were con struction land, water area and bare land, the dynamic degree of land use change process K2 reached 28.43% , 16.63% and 7.74%, respectively;in terms of mutual conversion of land use types, the conversion was mainly from for est land and cultivated land, followed by the conversion of grassland and bare land to construction land.