城市边缘区的界定方法研究——以西安为例

The Research On Division Methods of Urban Fringe ——A Case Study of Xi'an

通过对国内外对城市边缘区的界定方法的分析,发现城市边缘区的界定方法已由过去定性的经验划定逐步走向了定量与定性方法相结合的模式。文章以西安地区2002年1∶100000的遥感图像做成的假彩色合成影像图为计算依据,结合Matlab软件编制程序识别图像,运用"断裂点"法和"信息熵"法来进行运算处理,划定了西安城市边缘区的范围。尽管这两种方法都存在一定的主观经验判断的问题,但通过对西安城市边缘区划定的结果来看,两种方法可行性还是比较强的。

In this paper, false color photomontage with scale of 1：100000 treated by the remote sensing picture of xi＇an district in 2002 is the calculating base. At the same time, the Matlab software is applied to program and recognize the image. Two methods are used to divide the urban fringe of Xi＇an. One is the Breakpoint method, and the other is the method of Theory of Information Entropy. In fact, subjective distinguishing with experience is hooded in these two processes. Comparing the two operating results, the coincidence indicator of urban core area amounts to more than 90%, and the coincidence indicator Of urban fringe amounts to more than 80%. In a word, these two methods both have great feasibility.