| 摘要 |
PROBLEM TO BE SOLVED: To automatically generate three-dimensional information on facilities included in a two-dimensional map with a minimum quantity of stored data by determining the height of facilities in the map according to the size or area of the outline in the map. SOLUTION: A CPU reads in map data represented as polygons and stores them temporarily in a buffer memory (B1). According to the stored map data, the height (B2), color (B3), and pattern (B4) of the facilities are determined. According to the determined color, the pattern of the flank or the pattern of the top is determined. Factors used for the determination are the shape, and size or area of the outline in the polygon map, and the properties of the facilities in the polygon map. For example, when the outline is square or nearly square, the length of one side of the square is regarded as the height of the building. Further, the size or area of the outline is measured and the height of the building may be made proportional to the size or area.
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