| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that a car navigation system requires high plotting ability for plotting a three-dimensional map at the point of view watched from a driver. SOLUTION: On the basis of 'height of object to be displayed' and 'distance between the relevant object and the position of the viewpoint', it is previously judged whether or not the relevant object is to be displayed. Namely, concerning all buildings 25 belonging to the range from a present car position 21 to an inner circle 22, only buildings higher than middle rise among buildings 26 belonging to the range between the inner circle 22 and a middle circle 23 and only buildings higher than high rise among buildings 27 belonging to the range between the middle circle 23 and an outer circle 24, data are sent to a display device 16.
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