共查询到18条相似文献,搜索用时 62 毫秒
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采用对偶拓扑方法构建基于广义路网拓扑的复杂交通网络,通过引入m阶邻居节点概念,考虑复杂交通网络中节点度、介中心及节点间距离等因素,顾及节点自身及1到m阶邻居节点的重要度贡献,定义了节点重要度评价模型,进而提出一种基于m阶邻居节点重要度贡献的道路网自动选取方法,并基于网络最小规模原则保持选取道路的连通性。为检验方法的有效性,引入度分布评价所选取道路对路网整体结构及拓扑特性的保持程度,并采用实际城市路网进行试验,结果表明本文方法选取的路网能较好地保持了原始路网的整体结构、拓扑特性及道路连通性,且算法稳定、可靠。 相似文献
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针对现有算法在计算道路网节点重要度时忽略节点间的相互影响以及道路密度引起的重要度异常等问题,提出了一种基于加权网页排序算法的道路网自动提取方法。首先将道路连接成路段,以路段为网络节点,道路交叉作为节点连线,路段长度作为边的权重,将道路网抽象成有向有权图;然后利用加权网页排序算法计算有向有权图节点的重要度,并利用链接作弊检测的方法修正由道路密度引起的节点重要度异常,得到道路节点的最终重要度排序,从而完成道路网的提取。通过真实路网数据进行实验分析,结果表明,相对基于网络中心性的方法,该算法的提取结果能够更好地保留原始路网的密度差异和整体结构。 相似文献
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本文以1:50万军事交通图数据库为基础,探讨并研究了数据库支持下的自动制图综合的理论,方法和实施过程:重点研究了地图内容的选取、线状要素的化简和重迭要素的移位问题;尤其是对图形要素的移位,做了较为详细的分析,提出了检查线状要素之间图形重迭的方法及自动移位的具体措施,并给出了用于程序运行的一些详细算法。 相似文献
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提出了基于路网层次骨架控制的道路自动选取方法。首先,该方法以stroke为单位,利用中介中心性值对stroke进行层次结构划分;其次,采用结构特征识别完善道路层次骨架;第三,基于层次骨架间的连通关系建立逐层传递的stroke重要性计算模型;最后,通过该计算模型自上而下的逐层计算,得到stroke重要性,并据此完成道路网选取。采用3种典型道路网数据,对本方法与其他主要常规stroke选取方法进行对比,试验结果表明本方法不但对语义的依赖性极低,同时消除了中介中心性在评价道路重要性时对边缘道路的不利影响,在保持道路网整体结构和层次性上有较为明显的优势,可适用于各种形态的道路网选取。 相似文献
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《International Journal of Digital Earth》2013,6(2):133-153
Abstract When road symbols are shown in a size proportionate to the reduced scale, several problems of legibility may arise concerning the urban blocks. By the method proposed in this paper, in order to overcome these problems, urban block areas are enlarged through amalgamation and the intervening roads in the amalgams are eliminated. This method includes two new approaches for computation of threshold used in determination of important roads based on the connectivity measure, and for definition of minimum block space and area requirements based on graphic limits. A block life cycle was designed for amalgamation of blocks. For the amalgamation process, a new algorithm was developed. The experimental testing indicates that important roads and the roads surrounding the urban area have been preserved. A simpler and more legible road network has been acquired. This method can be described as a more holistic approach as the buildings are taken into account. The problems arising in the experimental testing indicate that the cartographic selection/elimination process is not sufficient by itself for road network generalization, which can be assumed as one of the integral parts of Digital Earth. As well as the selection/elimination, processes such as displacement and caricaturizing are also needed. 相似文献
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Multiple constraints for schematic road network map cartographic design are analyzed and summarized. Based on this, a set of quantitative criteria are set up and a new road network generalization method including progressive selection and displacement is proposed. Furthermore, topological checking methods for road networks are researched. Based on these constraints, the points in a road network are classified, and a satisfactory and effective schematic map is designed in a concrete experiment while maintaining topological consistency of the road network between the original and the schematic map. 相似文献
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Multiple constraints for schematic road network map cartographic design are analyzed and summarized. Based on this, a set of quantitative criteria are set up and a new road network generalization method including progressive selection and displacement is proposed. Furthermore, topological checking methods for road networks are researched. Based on these constraints, the points in a road network are classified, and a satisfactory and effective schematic map is designed in a con- crete experiment while maintaining topological consistency of the road network between the original and the schematic map 相似文献
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本文介绍了分形分析与制图综合的关系,把分形分析理论应用到城市道路自动综合中,利用分形分析理论与方法对城市道路进行自动综合,沿用已有算法针对城市道路的地理特征,改进了城市地图中基于道路几何特征的综合算法.结合分形分析方法进行制图综合,使制图综合中抽象的问题具体化,分形分析方法中自相似性给出了制图对象的局部和整体间在结构特... 相似文献
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