| SYSTEM FOR AUTOMATIC GENERALIZATION OF TOPOGRAPHIC MAPS |
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| 作者姓名： | YAN Hao-wen LI Zhi-lin AI Ting-hua |
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| 作者单位： | 1. School of Mathematics，Physics and Software Engineering，Lanzhou Jiaotong University，Lanzhou 730070，P. R. China; 2. GIS Division，Department of Geography，University of Zurich，Zurich，Switzerland; 3. Department of Land Surveying and Geo-Informatics，the Hong Kong Polytechnic University，Hong Kong，P. R. China; 4. School of Resource and Environment Science，Wuhan University，Wuhan 430079，P. R. China |
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| 基金项目： | Under the auspices of the National Natural Science Foundation of China (No. 40301037), and a PolyU Project(G-T873) |
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| 摘 要： | 1INTRODUCTION Map generalization may be defined as a procedure that generatessmallerscalemapsfromlargerscaleonesusing variousappropriateoperations (e.g.selection,combina- tion, displacement, simplification, etc.) under definite conditions (includingmap scale, purpose, etc.). The au- tomation of the generalization process has been a dream of cartographers for decades. For it is an indispensable wayto construct map databases from large-scale maps to small-scale ones, which can decrease repet…
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| 关 键 词： | 地图泛化 地形图 地理信息系统 数据库 |
| 文章编号： | 1002-0063（2006）02-0165-06 |
| 收稿时间： | 2006-01-20 |
System for automatic generalization of topographic maps |
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| YAN Hao-wen LI Zhi-lin AI Ting-hua.SYSTEM FOR AUTOMATIC GENERALIZATION OF TOPOGRAPHIC MAPS[J].Chinese Geographical Science,2006,16(2):165-170. |
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| Authors: | Hao-wen Yan Zhi-lin Li Ting-hua Ai |
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| Institution: | (1) School of Mathematics, Physics and Software Engineering, Lanzhou Jiaotong University, 730070 Lanzhou, P. R. China;(2) GIS Division, Department of Geography, University of Zurich, Zurich, Switzerland;(3) Department of Land Sarveying and Geo-Informatics, the Hong Kong Polytechnic University, Hong Kong, P. R. China;(4) School of Resource and Environment Science, Wuhan University, 430079 Wuhan, P. R. China |
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| Abstract: | With the construction of spatial data infrastructure, automated topographic map generalization becomes an indispensable component in the community of cartography and geographic information science. This paper describes a topographic map generalization system recently developed by the authors. The system has the following cha- racteristics: 1) taking advantage of three levels of automation, i.e. fully automated generalization, batch generalization, and interactive generalization, to undertake two types of processes, i.e. intelligent inference process and repetitive operation process in generalization; 2) making use of two kinds of sources for generalizing rule library, i.e. written specifications and cartographers' experiences, to define a six-element structure to describe the rules; 3) employing a hierarchical structure for map databases, logically and physically; 4) employing a grid indexing technique and undo/redo operation to improve database retrieval and object generalization efficiency. Two examples of topographic map generalization are given to demonstrate the system. It reveals that the system works well. In fact, this system has been used for a number of projects and it has been found that a great improvement in efficiency compared with traditional map generalization process can be achieved. |
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| Keywords: | map generalization system map database rule library topographic map |
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