General Principles for Automated Generation of Schematic Network Maps |
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Authors: | Zhilin Li |
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Institution: | 1. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, China.;2. Department of Land Surveying and Geo-Informatics, Hong Kong Polytechnic University, Hong Kongdean.ge@swjtu.edu.cn |
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Abstract: | Usually, a street map contains various types of detailed information and appears to be crowded. As a result, to many users, a street map looks complicated and is not easy to read and follow. In fact, to a certain degree, too much detail makes the map uninformative and noisy. The London tube map, called a schematic or topological map in some literature, has often been cited as an excellent example of a simplified map. Algorithms have been developed by researchers to automate the generation of schematic maps for road networks. However, it is found that there is still a lack of defined general principles and here four general principles have been formulated for schematisation – the Principle of the Preservation of the Topological Relationship; the Principle of the Preservation of the Main Structure of the Line Network; the Principle of Relativity in Position; and the Principle of Relativity in Length. The first two are the principles of preservation: these two should never be violated. The last two are principles of relativity: it is very desirable to keep these two intact unless there is an absolute need to violate them. |
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Keywords: | schematic maps schematization general principles |
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