Method and navigation sytem for display of sections of a digital map data base as well as an improved operating unit and interface for same

• US 20010007088A1
• Filed: 12/20/2000
• Published: 07/05/2001
• Est. Priority Date: 12/30/1999
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Fabian, Thomas, Tiemann, Dirk, Hessing, Bernd, Jung, Thomas, Otte, Dirk, Binnewies, Olaf, Nordsiek, Walter, Rentel, Bettina, Winter, Stephan
• Granted Patent: US 6,434,481 B2
• Time in Patent Office: Days
• US Class Current: 701/208
• CPC Class Codes: G01C 21/367 Details, e.g. road map scale, orientation, zooming, illumination, level of detail, scrolling of road map or positioning of current position marker
• CPC Class Codes: G09B 29/10 Map spot or coordinate position indicators; Map reading aids optical projection apparatus per se G03B

Abstract

A method, operating unit, navigation system and interface for displaying a predetermined section of a digital map database, which represents a real geographic area, on a display device are described. The digital map database contains data representing various geographic elements. An attribute, which defines a display priority, is assigned to each geographic element. An evaluation is then performed to determine whether or not particular geographic elements in the predetermined section to be displayed should or should not be visible on the display device. A particular geographic element is made visible on the display device when it is located in the predetermined section and when its display-priority-determining attribute satisfies certain selection criteria or selection rules. This method prevents display of too many geographic elements, which would otherwise make the display congested thus producing an unclear display.

Claims

1. A method of displaying a predetermined section of a digital map database, which represents a real geographic area, on a display device, the digital map database containing map data representing geographic elements, said method comprising the steps of:

a) selecting respective geographic elements for display according to the predetermined section of the digital map database to be displayed; and

b) determining whether the respective geographic elements selected in step a) are associated with corresponding display-priority-determining attributes; and

c) evaluating the display-priority-determining attributes of the respective geographic elements having the display-priority-determining attributes to determine whether the respective geographic elements in the predetermined section should be actually visible in the display device, or not.

2. The method as defined in

claim 1

, wherein a number of the geographic elements coincide with or overlap the predetermined section and the predetermined section has a predetermined scale;

and further comprising dynamically establishing a limiting value for the display-priority-determining attributes of the respective geographic elements to be actually visible, said limiting value depending on the number of the geographic elements coinciding with the predetermined section or on the predetermined scale of the predetermined section, and actually displaying only ones of the geographic elements having values of the display-priority-determining attributes above the limiting value.

3. The method as defined in

claim 1

, further comprising associating corresponding value ranges of the display-priority-determining attributes with displaying and not displaying the respective geographic elements.

4. The method as defined in

claim 1

, further comprising attributing corresponding relative overlap parameters (Z-level) to the respective geographic elements and displaying the respective geographic elements in the predetermined section one after the other in order of sequentially increasing relative overlap parameters.

5. The method as defined in

claim 1

, wherein the geographic elements include streets for motor vehicles, roads for motor vehicles, mountains, oceans, woods, buildings, restaurants, hotels and sites.

6. The method as defined in

claim 1

, wherein the display-priority-determining attributes of the geographic elements include respective travel directions, speed limits or street signs for roads and streets.

7. The method as defined in

claim 1

, further comprising storing the geographic elements of the digital map database as data on a data-recording medium.

8. The method as defined in

claim 1

, wherein the display-priority-determining attributes are already correlated with geographic elements in the digital map database or are correlated with the geographic elements in an interface provided between the digital map database and the display device.

9. The method as defined in

claim 1

, wherein relative magnitudes, not absolute values, of the display-priority-determining attributes are employed for selecting the geographic elements to be visible on the display device.

10. The method as defined in

claim 1

, further comprising providing at least one additional attribute for deciding whether or not to display individual ones of the respective geographic elements in the predetermined section.

13. The digital map database (12) as defined in

claim 1

1, wherein the respective geographic elements are stored as data on a data-recording medium.

11. A digital map database (12) representing real geographic areas, the digital map database (12) including data regarding respective geographic elements and corresponding attributes correlated with the respective geographic elements, wherein at least one part of the geographic elements is provided with respective additional display-priority-determining attributes defining corresponding display priorities for said at least one part of the geographic elements, the additional display-priority-determining attributes determining whether or not the geographic elements in a predetermined section of the digital map database are actually visible or not on the display device.

12. The digital map database (12) as defined in

claim 11

, wherein respective selection rules for the additional display-priority-determining attributes are provided which correlate with certain regions of the digital map data base, said selection rules establishing respective value ranges for the additional display-priority-determining attributes for which geographic elements having the additional display-priority-determining attributes within said value ranges should or should not be visible.

14. The digital map database (12) as defined in

claim 11

, wherein the geographic elements include streets for motor vehicles, roads for motor vehicles, mountains, oceans, woods, buildings, restaurants, hotels and sites.

15. The digital map database (12) as defined in

claim 11

, wherein the additional display-priority-determining attributes of the geographic elements include respective travel directions, speed limits or street signs for roads and streets.

16. The digital map database (12) as defined in

claim 11

, further comprising respective relative overlap parameters (Z-level) attributed to the geographic elements.

17. An operating unit (14) for a navigation system (100) comprising a display device (16) for display of a predetermined section of a digital map database (12), said predetermined section representing a real geographic area, the digital map database (12) including map data regarding respective geographic elements, said operating unit (14) comprising means for evaluating display-priority-determining attributes of the respective geographic elements, said means for evaluating display-priority-determining attributes of the respective geographic elements determining whether the respective geographic elements are visible or not in the predetermined section according to the predetermined section and according to the display-priority-determining attributes.

18. The operating unit (14) as defined in

claim 17

, wherein the means for evaluating display-priority-determining attributes includes means for determining a limiting value for the display-priority-determining attributes of the respective geographic elements to be actually displayed dynamically according to a number of the geographic elements in the predetermined section or according to a scale of the predetermined section, so that only ones of the geographic elements having display-priority-determining attributes above the limiting value are actually displayed.

19. The operating unit (14) as defined in

claim 17

, wherein the means for evaluating display-priority-determining attributes includes means for correlating respective value ranges of the display-priority-determining attributes with displaying and not displaying the respective geographic elements.

20. The operating unit (14) as defined in

claim 17

, wherein corresponding relative overlap parameters (Z-level) are attributed to the respective geographic elements and the means for evaluating display-priority-determining attributes includes means for displaying the respective geographic elements in the predetermined section on the display device one after the other in order with the relative overlap parameters thereof sequentially increasing.

21. The operating unit (14) as defined in

claim 17

, wherein the geographic elements include streets for motor vehicles, roads for motor vehicles, mountains, oceans, woods, buildings, restaurants, hotels and sites.

22. The operating unit (14) as defined in

claim 17

, wherein the display-priority-determining attributes of the respective geographic elements include respective travel directions, speed limits or street signs for roads and streets.

23. The operating unit (14) as defined in

claim 17

, further comprising means for storing the respective geographic elements of the digital map database (12) as data on a data-recording medium.

24. A navigation system (100) for vehicles including motor vehicles, said navigation system comprising a navigation module (10) including means for preparing a digital map database (12) and an operating unit (14) connected with the navigation module (10), said operating unit (14) having a display device (16) for displaying a predetermined section of the digital map database (12), said predetermined section representing a real geographic area;

wherein the digital map database (12) includes data regarding respective geographic elements and corresponding attributes correlated with the respective geographic elements, wherein at least one part of the geographic elements is provided with corresponding additional display-priority-determining attributes defining corresponding display priorities for said at least one part of the geographic elements, the display priorities determining whether or not the geographic elements in the predetermined section of the digital map database are actually visible or not on the display device (16); and

wherein the operating unit (14) comprises means for evaluating the corresponding additional display-priority-determining attributes of the respective geographic elements, said means for evaluating the corresponding additional display-priority-determining attributes of the respective geographic elements determining whether the respective geographic elements are visible or not in the predetermined section according to the predetermined section and according to the additional display-priority-determining attributes.

25. The navigation system (100) as defined in

claim 24

, wherein the navigation module (10) includes means for retrieving map data from a digital map database (12) stored on a data-recording medium or means for establishing a data link for obtaining the digital map database (12).

26. The navigation system (100) as defined in

claim 25

, wherein said data link is a radio link establishing a connection to an externally located database device.

27. The navigation system (100) as defined in

claim 25

, wherein said means for establishing said data link includes means for receiving and integrating actual traffic information with the data from the digital database (12).

28. The navigation system (100) as defined in

claim 27

, wherein said means for receiving said actual traffic information receives said traffic information by means of RDC-TMC.

29. An interface (18) connecting a digital map database (12) and display means (14, 16) for displaying a predetermined section of the digital data base (12), said digital database (12) representing actual geographic areas and containing data regarding respective geographic elements, said interface (18) including means for associating corresponding display-priority-determining attributes with the respective geographic elements during transfer of map data from the digital map database to the display means, said display-priority-determining attributes establishing whether or not individual ones of the respective geographic elements in the predetermined section of the digital database (12) are made visible or not in the display means in accordance with the predetermined section to be displayed.

30. The interface (18) as defined in

claim 29

, comprising means for connecting an operating unit (14) of the display means (14,16) and a navigation module (10) of a navigation system (100) with each other.