MAP DISPLAY SYSTEM, MAP DISPLAY DEVICE, AND MAP DISPLAY METHOD
First Claim
1. A map display system comprising a map display for displaying a map, and an information distribution server for distributing map data to said map display, the information distribution server being connected to said map display via a network;
- said map display system characterized in comprising;
map data storage means for storing map data having different display scales;
map data acquisition means for acquiring first map data having a first display scale configured from an area of a predetermined range, and second map data having a second map scale configured from an area of a wider range including the predetermined range, from map data stored in said map data storage means;
display means for displaying a map on the basis of said map data;
scroll means for scrolling the map displayed on said display means; and
display control means for displaying a map on said display means, the map having been changed to a predetermined display scale on the basis of said map data;
whereinsaid display control means is configured so as to display a map changed to said first display scale on the basis of the second map data acquired by said map data acquisition means, when the first map displayed on said display means is scrolled by the scroll control means and the first map data acquired by said map data acquisition means is insufficient.
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Accused Products
Abstract
When a map display system acquires first map data on an area of a predetermined range with a first display scale, the map display system also acquires second map data on an area of a larger range including the predetermined range with a second display scale at the same time. When the acquired first map data on the area of the predetermined range becomes insufficient since a first map displayed on a display means is scrolled, a map obtained by changing the display scale of the second map data to the first display scale is displayed. This provides the map display system which is controlled so as to efficiently acquire map data suitable for a communication type navigation system.
94 Citations
15 Claims
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1. A map display system comprising a map display for displaying a map, and an information distribution server for distributing map data to said map display, the information distribution server being connected to said map display via a network;
- said map display system characterized in comprising;
map data storage means for storing map data having different display scales; map data acquisition means for acquiring first map data having a first display scale configured from an area of a predetermined range, and second map data having a second map scale configured from an area of a wider range including the predetermined range, from map data stored in said map data storage means; display means for displaying a map on the basis of said map data; scroll means for scrolling the map displayed on said display means; and display control means for displaying a map on said display means, the map having been changed to a predetermined display scale on the basis of said map data;
whereinsaid display control means is configured so as to display a map changed to said first display scale on the basis of the second map data acquired by said map data acquisition means, when the first map displayed on said display means is scrolled by the scroll control means and the first map data acquired by said map data acquisition means is insufficient. - View Dependent Claims (2, 3, 4, 5)
- said map display system characterized in comprising;
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6. A map display for displaying a map distributed from an information distribution server comprising map data storage means for storing map data having different display scales, the map display being connected via a network to the information distribution server;
- said map display characterized in comprising;
map data acquisition means for acquiring first map data having a first display scale configured from an area of a predetermined range, and second map data having a second map scale configured from an area of a wider range including the predetermined range, from map data stored in said map data storage means; display means for displaying a map on the basis of said map data; scroll means for scrolling the map displayed on said display means; and display control means for displaying a map on said display means, the map having been changed to a predetermined display scale on the basis of said map data;
whereinsaid display control means is configured so as to display a map changed to said first display scale on the basis of the second map data acquired by said map data acquisition means, when the first map displayed on said display means is scrolled by the scroll control means and the first map data acquired by said map data acquisition means is insufficient. - View Dependent Claims (7, 8, 9, 10)
- said map display characterized in comprising;
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11. A map display method in a map display for displaying on display means a map distributed from an information distribution server comprising map data storage means for storing map data having different display scales, the map display being connected via a network to the information distribution server;
- said map display method characterized in comprising;
a first step for acquiring first map data having a first display scale configured from an area of a predetermined range, and second map data having a second display scale configured from an area of a wider range including the predetermined range, from map data stored in said map data storage means; a second step for displaying a first map on the basis of said map data; a third step for scrolling the first map displayed by said second step; and a fourth step for displaying a map changed to said first display scale on the basis of the second map data acquired by said first step, when the first map data acquired by said first step is insufficient due to the process of scrolling said first map in said third step. - View Dependent Claims (12, 13, 14, 15)
- said map display method characterized in comprising;
Specification