Map display device, a memory medium and a map display method

• US 20010024203A1
• Filed: 03/19/2001
• Published: 09/27/2001
• Est. Priority Date: 03/21/2000
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: Masuda, Hiroyoshi, Yamada, Kunihiro, Shibata, Yumi, Kaji, Takanori
• Granted Patent: US 6,950,100 B2
• Time in Patent Office: Days
• US Class Current: 345/428
• CPC Class Codes: G01C 21/3667 Display of a road map G01C21/3614 takes precedence; guidance using 3D or perspective road maps G01C21/3635
• CPC Class Codes: G01C 21/3867 Geometry of map features, e.g. shape points, polygons or for simplified maps
• CPC Class Codes: G09B 29/106 using electronic means

Abstract

A map display device using an input unit for inputting a display scale, a memory for storing polygon map data, a drawing processing control unit for drawing a polygon map by loading polygon map data from the memory and a display unit for displaying an output from the drawing processing control unit, wherein the drawing processing control unit is provided with a function for determining a unit of a polygon map that should be drawn and drawing a polygon map of the determined unit.

Claims

1. A map display device, comprising:

memory means for storing polygon map data;

drawing processing control means for drawing a polygon map by reading the polygon map data from the memory means; and

display means for displaying an output from the drawing processing control means, wherein the drawing processing control means is equipped with a function for determining a unit of a polygon map that should be drawn and draws a polygon map of the determined unit to distinguish between a plurality of unit levels.

2. The map display device according to

claim 1

, wherein the drawing processing control means reads polygon map data within the predetermined range, including the range of display, from the memory means and display patterns of adjoining polygon maps which are drawn different from each other.

3. The map display device according to

claim 1

, wherein the drawing processing control means determines a vehicle present position or a cursor present position and only polygon map data, including the detected present position, is read from the memory means and drawn.

4. The map display device according to

claim 1

, wherein the memory means stores therein a plurality of polygon map data comprising a different number of coordinates in a one to one correspondence with display scales for a corresponding polygon unit and the drawing processing control means reads the polygon map data corresponding to the input display scale and draws a polygon map.

5. The map display device according to

claim 4

, wherein the number of coordinates in the plurality of polygon map data becomes smaller as the area becomes larger.

6. The map display device according to

claim 1

, wherein the memory means stores one polygon map data on the basis of each polygon unit and drawing processing control means draws a polygon map corresponding with a display scale input by reading the polygon map data.

7. The map display device according to

claim 1

, further comprising input means for inputting a display scale, wherein the drawing processing control means determines a unit of a polygon map that should be drawn on the basis of the display scale input by the input means and draws a polygon map of the determined unit.

8. The map display device according to

claim 7

, wherein the drawing processing control means reads polygon map data within the predetermined range, including the range of display, from the memory means and display patterns of adjoining polygon maps which are drawn different from each other.

9. The map display device according to

claim 7

, wherein the drawing processing control means determines a vehicle present position or a cursor present position and only polygon map data, including the detected present position, is read from the memory means and drawn.

10. The map display device according to

claim 7

, wherein the memory means stores therein a plurality of polygon map data comprising a different number of coordinates in a one to one correspondence with display scales for a corresponding polygon unit and the drawing processing control means reads the polygon map data corresponding to the input display scale and draws a polygon map.

11. The map display device according to

claim 10

, wherein the number of coordinates in the plurality of polygon map data becomes smaller as the area becomes larger.

12. The map display device according to

claim 7

, wherein the memory means stores one polygon map data on the basis of each polygon unit and drawing processing control means draws a polygon map corresponding with a display scale input by reading the polygon map data.

13. The map display device according to

claim 1

, wherein the drawing processing control means draws a polygon map that is included in the range of display and of the largest unit.

14. The map display device according to

claim 13

, wherein the drawing processing control means reads polygon map data within the predetermined range, including the range of display, from the memory means and display patterns of adjoining polygon maps are which are drawn different from each other.

15. The map display device according to

claim 13

, wherein the drawing processing control means determines a vehicle present position or a cursor present position and only polygon map data, including the detected present position, is read from the memory means and drawn.

16. A computer readable memory medium, wherein the computer readable memory medium stores therein a polygon map database, and programs for determining a unit of a polygon map that should be drawn and drawing a polygon map of the determined unit to distinguish between a plurality of unit levels.

17. A method for displaying a map, comprising:

storing polygon map data; and

displaying a polygon map by reading the stored polygon map data, determining a unit of a polygon map that should be displayed and displaying a polygon map of the determined unit to distinguish between a plurality of unit levels.