基于RS和GIS的开封市土地覆盖分形

以RS和GIS为技术手段,利用开封市0.61m空间分辨率的QuickBird卫星遥感数据,采用分形几何方法研究了斑块的面积效应和覆盖类型分形的关系,并对覆盖类型的分形特征差异等进行了分析。结果表明,开封市防护林地和农田的平均斑块面积较大,分维数也较大,而水体的分维数较小,说明防护林和农田斑块的边界结构特征比水体更为复杂。斑块的分维值具有尺度依赖性,同一类型中大的斑块往往具有较大的分维值,其原因是大斑块经常出现不同类型的斑块相互嵌套,小斑块则很少出现甚至不出现这种现象。

Fractal of land cover in Kaifeng City based on RS and GIS

With the application of RS and GIS techniques,as well as the QuickBird images with spatial resolution of 0.61 m,fractal theory was employed to study the relationships between the area effect of patches and the fractal of land cover in Kaifeng City,and the prominence of the difference of fragmentation distribution was analyzed. The results showed that shelterbelt and farmland occupied larger area and had larger fractal dimension,while the fractal dimension of water body was smaller,indicating that the patch structure of shelterbelt and farmland was more complex than that of water body. The fractal dimension of patch was scale-dependent. The same type of medium and large patches always had larger fractal dimension,because inlaid patches often existed in these patches but rarely in the smaller one.