| 摘要 |
PROBLEM TO BE SOLVED: To provide a picture processor and its method capable of reducing the number of maps in shell plotting and easily controlling an LOD also. SOLUTION: The picture processor is provided with a map storage part 12 for storing a plurality of map data including parameters and height information necessary for shell plotting and outputting map data corresponding to map addresses, a map address changing part 13 for finding out map numbers expressing different maps, finding out the offsets of the map addresses, changing the map addresses on the basis of the offsets, and supplying the changed map addresses to the map storage part 12, a judgment part 14 for judging the area of effective height values on the basis of layer numbers expressing different layers and judging whether a plotting target is effective or not, and a plotting part 16 for plotting a shell on the basis of the map data outputted from the map storage part 12 only when the judged result of the judgment part 14 is effective. COPYRIGHT: (C)2004,JPO
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