Research on Digital Map Data in Geographic Information System

在e-Japan战略中，地理信息系统(GIS)被列为信息社会最重要的信息基础设施之一。地理信息系统是一个使用前沿信息和通信技术的多用途系统，许多社会系统都使用地理信息系统的数据。地理信息系统得到了数据结构、算法理论、计算拓扑学、图论、计算几何等多个基础学科的支持。然而，在地理信息系统中，从各种数字地图中很难找到所需的信息。由于数字地图中的数据量巨大，每个地图都有自己的数据格式，这些地图不能确保一致性。因此，迫切需要集成的数字地图。建立集成数字地图的技术是我们研究项目的目的。首先，我们研究了地理调查局发布的数字地图2500与其他数字地图的区别，并研究了解决它们与数字地图重叠的问题。在许多应用领域，解决实际问题都离不开地理信息系统数据。因此，我们使用实际的GIS数字数据来解决这些问题，并建议从多个角度来看待这些数据。从数字地图绘制易于阅读的地图在地理信息系统中很重要，我们研究了绘制地图的方法。特别提出了地图标注放置和路线图绘制的方法。还对未来需要进行的基础研究进行了调查。

In the e-Japan strategy, Geographic Information Systems (GIS) rank as one of the most important information infrastructures for the information society. GIS is a multipurpose system using leading-edge information and communication technology, and a lot of social systems use GIS data. GIS is supported by various fundamental academic fields, such as data structure, algorithm theory, computational topology, graph theory, computational geometry, and so on. However, it is hard to find necessary information from various digital maps in GIS. Because there is enormous amount of data in digital maps, each map has its own data format and those maps do not ensure consistency. Therefore integrated digital maps are strongly required.Establishing technology to integrate digital maps was our purpose in this research project. First, we investigated the distinction of Digital Map 2500 published by the Geographical Survey Institute and some other digital maps, and have researched on resolving their consistency to overlap those digital maps. In many application areas, GIS data is necessary for solving practical problems. Accordingly, we use the actual GIS digital data for solving those problems and propose to look at the data from many points of view. Drawing easy-to-read maps from digital maps is important in GIS and we investigated methods of drawing maps. Especially, methods of map labeling placement and drawing route maps were proposed. Fundamental research required in the future has been also investigated.