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构建加权长度—半径分维模型,基于武汉城市圈城乡道路网空间数据,运用GIS空间分析方法,探讨武汉城市圈城乡道路网的密度分形特征及其时空演化规律。武汉城市圈城乡道路网不同程度表现出分形性即具有结构自相似性;不同等级路网的密度分维值普遍遵循距离衰减规律,路网具备较大的扩展潜力;高等级路网发育相对迟缓,由中心向边缘的密度衰减较快,且在分布形态上围绕圈域核心武汉市呈强凝聚态展布;低等级道路则相对发育成熟,分布均匀,覆盖效果较好;不同等级路网的普通和加权长度—半径维数均表现为圈层式结构,遵循中心—外围的距离衰减律;不同时段城乡道路网的分维值不断上升,路网结构渐趋优化,且存在明显的双标度区的双分形结构。
Based on the spatial data of urban and rural road network in Wuhan metropolitan area, this paper constructs the weighted length - radius fractal dimension model and uses GIS spatial analysis method to explore the density fractal features of urban and rural road network in Wuhan urban agglomeration and its temporal and spatial evolution. Wuhan urban agglomeration showed a fractal structure with different degrees of structural self-similarity. The fractal dimension values of different grades of road network generally follow the law of distance decay, and the road network has great potential for expansion. The development of high-grade road network is relatively slow , From the center to the edge of the density decay faster, and in the distribution of morphology around the core Wuhan city was strong condensed state distribution; low-grade roads are relatively mature, distributed evenly, covering better; different levels of road network The normal and weighted length-radius dimensions all appear as a circle-like structure, following the center-periphery distance attenuation law. The fractal dimension values of urban and rural road network are increasing at different periods, and the road network structure is gradually optimized, and there is an obvious double standard Degree zone of the double fractal structure.