南京市道路网络近十年的分形特征变化

以分形理论为基础,结合2005年南京市道路网络分形特征的研究结果,测算2012年南京市道路网络的分形特征。将两个年份的研究结果进行比较,分析南京市道路网络近十年的分形特征变化情况。结果显示,2012年南京市道路网络的长度维数和分枝维数分别增长0.011 5和0.050 7,说明近十年南京市道路网络的连通程度和覆盖程度都有一定的发展,同时连通程度的发展快于覆盖程度。2012年南京市主城区各行政区道路网络的盒子维数也有所增长,增长值介于0.069 7~0.170 1之间,表明南京市主城区各行政区道路网络的覆盖深度都有提高但程度不同。研究结果表明,2012年南京市主城区各行政区分形特征与经济状况没有直接的对应关系。

The changes of fractal characters of Nanjing road network

Based on the fractal theory ,combined with the research results of the fractal characteristics of Nanjing road network in 2005 ,this paper calculates the fractal features of Nanjing road network in 2012 . Comparing the results of two years ,it analyzes the changes of fractal features of Nanjing road network for nearly 10 years .Results show that the length dimension and branch dimension of Nanjing road network in 2012 has increased by 0.011 5 and 0.050 7 respectively ,w hich indicates that the connectivity and coverage of road network have had certain development in recent ten years . At the same time , the degree of connectivity develops faster than the coverage .The box dimension of road network of each administrative region of main urban area in Nanjing has also grown ,in between 0.069 7 and 0.170 1 .It shows the depth of coverage of road network of each region has improved but in different levels .As the same in 2005 ,the fractal features have no direct corresponding relationship with the economy .