Abstract
The authors have studied a method to unify and manage multiple scale vectorized map data using hierarchical structure. The method manages vectorized map data by tree structure, easily extracts only necessary data according to a reduced scale of a map. Which should be displayed, and draws it. The features of the proposed method are that it draw vector data more quickly than a method of always drawing all data regardless of the reduced scale, and that the total amount of data is less than that of the method which independent data is prepared beforehand at each reduced scale. Moreover, the proposed method is quite effective in reducing the capacity of HD (disk storage device) required to store all the vector data consisting of a large number of hierarchies, that is, a lot of kinds of reduced scales. It is effective to navigation systems etc. which use Web communication. This paper describes the proposed method and its data structure, moreover it clarifies the feature of the proposed method by applying the proposed method to coastline data of the Japan Islands and evaluating the experimental results.
