基于RS与GIS的榆林地区土地动态变化分析

Dynamic Monitoring Analysis of Land Use Based on RS and GIS in Yulin

为了研究榆林地区近13年来土地利用结构变化及其趋势,本文选用1993年、2000年和2006年三期遥感影像,利用Erdas软件和ArcGIS 9.1软件,采用土地利用动态度、开发度和耗损度等指数模型,分析了榆林地区1993-2006年土地利用类型的数量变化和空间变化特征以及各地类的转移情况。结果表明:榆林地区13年来各类土地利用类型综合动态度有下降趋势;各类土地利用类型的增减在空间上变化比较大,通过统计分析显示,草地、耕地变化较快,林地、建设用地呈增长趋势,未利用地、水域面积减少;土地利用动态度、开发度和耗减度3个指标可以更全面,有效地反映出榆林地区13年来土地变化情况。

For investigating the land use change and developing trend of Yulin, By using image processing module and computerized interpretation module of Erdas, seven land use types （grassland, farmland, forest, unused land, desert, construction land and water） derived from the remote sensing images in 1993, 2000 and 2006 of Yulin. Furthermore, the data processing function of Excel and statistic analysis module of ArcGIS conducted the analysis of land use change from 1993 to 2006. As a result, this paper obtained a set of land use change diagrams and transfer matrix charts of land use, and it summarized the characteristics of dynamic change of land use in the past thirteen years. The result indicates that：the comprehensive dynamic state degree is present to down-trend; each kind of land use of a type changes fast variety to increase or decrease on the space; three indexes can be more availability to reflect the Yulin area variety circumstances.