Transport network extensions for accessibility analysis in geographic information systems
Transport network extensions for accessibility analysis in geographic information systems
复制标题
用于地理信息系统中可达性分析的传输网络扩展
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
T. Tillema
中科院分区：
文献类型：
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作者：
T. Jong;T. Tillema
在许多发达国家，高质量的数字交通网络可用于基于地理信息系统的分析。这在一定程度上是由于互联网和汽车导航系统的路线规划软件的要求。这些网络的属性包括道路质量属性、方向性和转盘。相比之下，在许多所谓的发展中国家，即使是最基本的地理信息系统业务，也几乎没有质量足够的数字网络存在。假设在短期内就能提供高质量的数字网络是不现实的。在这种情况下，可以创建一个航空网络。然而，这种类型的网络假设均匀空间，不考虑任何物理障碍。Willowvale案例用于介绍（修改的）Delauney网络的概念，该网络仅在物理上相邻的地点之间创建航空联系。本文的目的是双重的。首先，评估了“航空公司”和“德劳尼”网络在多大程度上可以作为昂贵的基于现实的数字路线图的简化廉价替代品。这些替代网络的适用性在荷兰的一个案例中得到了检验，那里已经有了详细的数字路线图。结果表明，与航线距离相比，用Delauney网络计算的出发地距离更符合实际网络的距离。由此得出结论，特别是在异质区域，Delauney方法提供了一种可接受的方法来创建替代路线图，其唯一目的是估计地点之间的旅行距离。“达累斯萨拉姆”的案例说明，当道路网络需要服务于城市地区而不是连接小村庄时，也可以应用该方法。本文的第二个目的更进了一步，旨在深入了解当将Delauney网络用作网络扩展时，可访问性结果的敏感性，以便在现有的数字路线图上增加更多地方层面的细节。“埃因霍温”案例的结果表明，增加一个更详细的低尺度网络确实对可达性结果有实质性的影响
In many developed countries high quality digital transport networks are available for GIS based analysis. Partly this is due to the requirements of route planning software for internet and car navigation systems. Properties of these networks consist among others of road quality attributes, directionality and turntables. In contrast in many so-called developing countries hardly any digital networks of sufficient quality exist for even the most basic GIS operations. It is not realistic to assume that on a short term high quality digital networks will become available. In such a case an airline network can be created. However this type of network assumes homogeneous space and does not take any physical obstacles into account. The Willowvale case is used to introduce the concept of (modified) Delauney networks that only creates airline links between physically neighboring locations. The purpose of this paper is twofold. First it is assessed to what extent ‘Airline’ and ‘Delauney’ based networks can be used as simplified cheap alternatives for the expensive digital road maps based on reality. The suitability of these alternative networks is examined in a Dutch case, where a detailed digital road map already exists. Results indicate that origin-destination distances computed with Delauney networks, when compared to airline distances, are much more in line with distances derived from the actual network. This leads to the conclusion that especially in heterogeneous areas the Delauney method offers an acceptable way of creating alternative road maps for the sole purpose of estimating the travel distance between locations. The ‘Dar es Salam’ case is used to illustrate that the method can also be applied when the road network needs to serve an urban area instead of linking small villages. The second purpose of the paper goes one step further and aims at getting insight into the sensitivity of accessibility outcomes when a Delauney network is used as a network extension to add more detail at the local level to an already existing digital road map. Results for the ‘Eindhoven’ case indicate that the addition of a more detailed lower scale network does indeed have a substantial influence on accessibility results