以直角方式转折的面状要素图形简化方法

郭庆胜

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以直角方式转折的面状要素图形简化方法

郭庆胜

文章导航 > 武汉大学学报 ● 信息科学版 > 1999 > 24(3): 255-258

郭庆胜. 以直角方式转折的面状要素图形简化方法[J]. 武汉大学学报 ● 信息科学版, 1999, 24(3): 255-258.

引用本文:

郭庆胜. 以直角方式转折的面状要素图形简化方法[J]. 武汉大学学报 ● 信息科学版, 1999, 24(3): 255-258.

Guo Qingsheng. The Method of Graphic Simplification of Area Feature Boundary as Right Angle[J]. Geomatics and Information Science of Wuhan University, 1999, 24(3): 255-258.

Citation:

Guo Qingsheng. The Method of Graphic Simplification of Area Feature Boundary as Right Angle[J]. Geomatics and Information Science of Wuhan University, 1999, 24(3): 255-258.

以直角方式转折的面状要素图形简化方法

郭庆胜

武汉测绘科技大学土地科学学院, 武汉市珞喻路129号, 430079

基金项目: 国家教育部霍英东青年教师基金资助项目

详细信息

作者简介:
郭庆胜,男, 33岁,教授,现从事地图学与GIS研究

中图分类号: P283.1;P283.7

The Method of Graphic Simplification of Area Feature Boundary as Right Angle

Guo Qingsheng

School of Land Scinece, WTUSM, 129 Luoyu Road, Wuhan, China, 430079

摘要: 讨论了面状要素图形轮廓简化的一些规则以及面的空间知识获取方法,结合以直角方式转折的面状要素图形轮廓的特点,重点讨论了其图形渐进式简化方法。
- 地图自动综合 /
- 面状要素 /
- 空间知识 /
- 渐进式图形简化
Abstract: Area feature boundary is one of cartographic objects, its simplification is very important in map generalization. There are many existent methods of boundary simplification. But, in maps at large scale, boundary as right angle is a special cartographic object. There are not any methods used in this kind of cartographic object generalization. A special method must be given for this cartographic object. In this paper, some rules of simplification of area feature boundary and the method of getting spatial knowledge are discussed, such as maintaining area and shape of area feature. The area of boundary can be meintained with respect to calculation of area of added or deleted small parts. The special poins, such as points, such as points on convex hull, are used to control the shape of boundary. The spatial knowledge of boundary can be acquired with respect to computational geometry, and can be represented with the rules and the set of characteristic points. This spatial knowledge can control the map generalization operators. This paper focuses on the progressive method of graphic simplification of area feature boundary as right angle based on its characteristics. The smallest unit used for area feature boundary generalization is rectangle. The rules of establishing rectangle are shown in this paper. In every step, the smallest rectangle is deleted according to the rules. For special case, the boundary data must be handled specially. This idea can be used to other cartographic features. Progressive graphic simplification method can control all details of cartographic object to be generalized. So the sudden change in map generalization can be got from the progressive change, using this method.
- automatic map generalization /
- area feature /
- spatial knowledge /
- progressive graphic simplification

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[19]	郭庆胜. 点状要素与线状、面状要素的关系处理 . 武汉大学学报 ● 信息科学版, 1993, 18(S1): 68-71.
[20]	郭庆胜. 线状要素与面状要素的关系处理 . 武汉大学学报 ● 信息科学版, 1993, 18(S1): 72-74.

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以直角方式转折的面状要素图形简化方法

郭庆胜

武汉测绘科技大学土地科学学院, 武汉市珞喻路129号, 430079

基金项目: 国家教育部霍英东青年教师基金资助项目

作者简介:
郭庆胜,男, 33岁,教授,现从事地图学与GIS研究

收稿日期: 1999-01-07
刊出日期: 1999-03-05

中图分类号: P283.1;P283.7

关键词:

摘要: 讨论了面状要素图形轮廓简化的一些规则以及面的空间知识获取方法,结合以直角方式转折的面状要素图形轮廓的特点,重点讨论了其图形渐进式简化方法。

English Abstract

The Method of Graphic Simplification of Area Feature Boundary as Right Angle

Guo Qingsheng

School of Land Scinece, WTUSM, 129 Luoyu Road, Wuhan, China, 430079

Received Date: 1999-01-07
Publish Date: 1999-03-05

Keywords:

Abstract: Area feature boundary is one of cartographic objects, its simplification is very important in map generalization. There are many existent methods of boundary simplification. But, in maps at large scale, boundary as right angle is a special cartographic object. There are not any methods used in this kind of cartographic object generalization. A special method must be given for this cartographic object. In this paper, some rules of simplification of area feature boundary and the method of getting spatial knowledge are discussed, such as maintaining area and shape of area feature. The area of boundary can be meintained with respect to calculation of area of added or deleted small parts. The special poins, such as points, such as points on convex hull, are used to control the shape of boundary. The spatial knowledge of boundary can be acquired with respect to computational geometry, and can be represented with the rules and the set of characteristic points. This spatial knowledge can control the map generalization operators. This paper focuses on the progressive method of graphic simplification of area feature boundary as right angle based on its characteristics. The smallest unit used for area feature boundary generalization is rectangle. The rules of establishing rectangle are shown in this paper. In every step, the smallest rectangle is deleted according to the rules. For special case, the boundary data must be handled specially. This idea can be used to other cartographic features. Progressive graphic simplification method can control all details of cartographic object to be generalized. So the sudden change in map generalization can be got from the progressive change, using this method.

郭庆胜. 以直角方式转折的面状要素图形简化方法[J]. 武汉大学学报 ● 信息科学版, 1999, 24(3): 255-258.

引用本文:

郭庆胜. 以直角方式转折的面状要素图形简化方法[J]. 武汉大学学报 ● 信息科学版, 1999, 24(3): 255-258.

Guo Qingsheng. The Method of Graphic Simplification of Area Feature Boundary as Right Angle[J]. Geomatics and Information Science of Wuhan University, 1999, 24(3): 255-258.

Citation:

Guo Qingsheng. The Method of Graphic Simplification of Area Feature Boundary as Right Angle[J]. Geomatics and Information Science of Wuhan University, 1999, 24(3): 255-258.