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Development of Numerical Technique for Urban Landscape Assessment by Computer Calculation

计算机计算城市景观评价数值技术的发展

基本信息

批准号：
07650712
负责人：
IIZUKA Hideo
金额：
$ 0.83万
依托单位：
Kyoto Prefectural University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

This study is about development of mathematical technique by computer for the urban landscape evaluation including program. A master has 2 theme, and the first theme is visibility analysis of skyline of Higashiyama in Kyoto, and the second theme is selection of the area by using photographic image of natural landscape viewing through an urban area and 3-D model that is produced from "Digital map data (50 m grid elevation)" published by Geographic Strrvey Institute of Japan. Here is peculiar in the point which contains the system development including hiden-surface elimination technique (Z buffer method) of computer graphics (CG).The flow of the treatment toward the first problem is stated next. (1) Many view points are caused on the road which anyone can enter. (2) Buildings- model for 3D graphics is several polygons which is similar to wall that compose town-block. (3) Visibility ratio of mountain skyline is computed by Z-buffer algorithm of CG. (4) A calculation result is drawn in the figure to make it easy to be understood.The treatment process of the second problem is like this. (1) Make digital image of photograph, for example, view of Higashiyama, or Eastern Mountains, in Kyoto. (2) Accomplish 3-D model of the geographical features that is based on digital map data (50 m grid elevation). (3) Produce the perspective image from same viewing point by software of 3-D CCG. (4) Make image by overlaing area of mountain surface on same outline area of (1)'s image. (5) Calculate for making image of perspective view as same as previous perspective image, at that time exacting visible area by the technique that is based on Z-buffer method of CG. (6) Draw selected area on a map.Personal computer, workstation, digital-camera, digitizer and scanner were combined, and a system was made, and software on the market and the software of the own work were used by this research.

本研究是利用电脑发展城市景观评估的数学技术，包括程式。大师有两个主题，第一个主题是京都东山的天际线的可见性分析，第二个主题是通过城市区域观察自然景观的摄影图像和从日本地理研究所出版的“数字地图数据（50米网格高程）”中产生的3-D模型来选择区域。这里的特殊之处在于包含计算机图形学（CG）的消隐技术（Z缓冲区法）的系统开发。(1)许多观点是在任何人都可以进入的道路上造成的。(2)建筑物-3D图形的模型是几个多边形，类似于组成城镇街区的墙壁。(3)利用CG中的Z缓冲算法计算山脉天际线的可见度。(4)图中画出一个计算结果，便于理解。第二个问题的处理过程是这样的。(1)制作照片的数字图像，例如，在京都的东山或东山的景色。(2)完成基于数字地图数据（50米网格高程）的地理特征三维模型。(3)用三维CCG软件生成同一视点的透视图。(4)通过在（1）图像的相同轮廓区域上叠加山表面的区域来制作图像。(5)通过基于CG的Z-缓冲区方法的技术，计算出使透视图图像与前一透视图图像相同，此时提取的可见区域。(6)在地图上画出选定的区域，本研究将个人计算机、工作站、数码相机、数字化仪和扫描仪结合起来，制作了一个系统，并使用了市场上的软件和自己的软件。