JPH0721497A - Method for controlling display of map in navigation system - Google Patents

Abstract

PURPOSE:To clear a specified spot and to furthermore improve the service of a navigation system by easily understanding the peripheral state of a specific, spot. CONSTITUTION:This navigation system is provided with an operation means for enabling a user to specify the execution of a required function, a reading means for reading out map data or the like from a storage medium including map data and retrieval data for plural spots, and a display means for displaying the read map or the like. When the operation means specifies the display of a map for a specific retrieving spot dislayed by the display means, specified map data MO to be map data for a screen including the specific spot (XEP) and peripheral map data M1 to M8 to be map data for plural pictures around the specified map data MO are also read out by the reading means and a map for an area determined by the specified spot to be the center of the display screen 10 of the display means is displayed by the display means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a navigation system, and more particularly to a map display control method in the navigation system.

[0002]

2. Description of the Related Art A navigation system is a system for guiding operation by displaying the current position, traveling direction, destination and the like of a vehicle on a map using a display. Current navigation systems receive radio waves from satellites to measure the current position of the vehicle,
In addition to the navigation function displayed on the map (digital map) read from the ROM, there are integrated service functions and digital map functions. The integrated service function is
Various service information recorded on the CD-ROM (for example, information about facility contents and fees for hotels)
The location recorded on the CD-ROM can be displayed on the digital map. The digital map function is a function that allows the map information stored in the CD-ROM to be viewed in the same manner as a map book.

[0003]

However, in the conventional navigation system, a certain index data is read from the CD-ROM containing the index data and the map data and displayed, and the map of the point designated by the index data is further displayed. When reading and displaying, the designated point was only marked on the map. That is, depending on the designated point, it may be the edge of the display screen, and at that time, there is a drawback that the surrounding situation is difficult to understand.

In view of the above situation, an object of the present invention is to provide a navigation system capable of clarifying a designated point by making it easy to understand the surrounding conditions of the designated point. That is, an object of the present invention is to further improve the serviceability of the navigation system.

[0005]

SUMMARY OF THE INVENTION A map display control method in a navigation system according to the present invention devised to achieve the above object is an operation means for a user to designate execution of a desired function. And a reading means for reading the map data and the index data from a storage medium containing the map data and the index data for the points, and a display means for displaying the read map data and the index data. In the system, when the operation means specifies to display a map for a specific point in the index displayed on the display means, a designated map which is one screen of map data including the designated point Along with the data, the peripheral map data, which is the map data for a plurality of screens around the designated map data, is also read from the reading means. A map of the region and the center of the display screen of said display means the specified point to displayed by the display means.

[0006]

With the above-mentioned configuration, when it is designated to display the map for a specific point in the index, a map with the specified point as the center of the display screen can be displayed, and the user can You will be able to easily understand your surroundings.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram showing a hardware configuration of a navigation system according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is an operation key, and reference numeral 2
Is a main microcomputer, reference numeral 3 is a display drive circuit, reference numeral 4 is a display, reference numeral 5 is a CD-R.
Reference numeral 6 denotes a CD-ROM decoder, reference numeral 7 denotes a CD-ROM, and reference numeral 8 denotes a communication interface. The main microcomputer 2
Map data and the like are read from the CD-ROM microcomputer 5 via the communication interface 8 and displayed on the display 4. If there is a key operation by the operation key 1, a predetermined process is executed according to the input.

FIG. 2 shows the main microcomputer 2
3 is a schematic flowchart showing the processing procedure of FIG. In step 1000, initialization such as clearing flags and displaying an initial screen is performed. Next, it is determined in step 1001 whether or not there is a switch input (key operation) from the user, and if there is, that processing is performed in step 1002. When there is no switch input and after the switch processing is completed, it is determined in step 1003 that the vehicle position is updated. If it has been updated, the map display update determination is made in step 1004, and the map is displayed (step 100).
5). When the above process is completed, step 1001 is executed again.
Return to and repeat the same process.

FIG. 3 shows a flowchart of the switch processing in step 1002 in the above procedure. First, in step 102, an instruction by the key operation causes a map of a specific point designated in the index to be displayed.
Determine if it is a request to display. If so, in step 104, the map data (designated map data) including the designated spot is read from the CD-ROM microcomputer 5 via the communication interface 8. Then, in step 106,
The peripheral map data for the number of images that can be drawn on the memory is read.

In this case, the processing differs depending on the number of drawable sheets on the memory. For example, display screen 9 on the memory
When it is possible to draw one sheet, as shown in FIG. 4, map data M1 and M that form a map around the designated map data M0.
2, ..., M8 are read. Further, when it is possible to draw four sheets, first, as shown in FIG. 5 (A), the designated map data M0 is divided into four to obtain M0a, M0b, M0c and M0d, and the designated points (marked by x) are It determines which of the areas it belongs to. Then, for example, if the designated point is in the upper left area within M0, that is, M0a, three map data having a positional relationship of M1, M2, and M3 with respect to M0 are displayed as shown in FIG. 5B. read out. The designated point is M0
Also in the case of b, M0c, and M0d, three peripheral map data are similarly read out based on the idea that the designated point is near the center of the entire drawing area.

Next, in step 108 of FIG. 3, the read designated map data M0 is drawn near the center of all drawing areas on the memory. Here, when the drawable number is 9, as shown in FIG. 4, the drawing is performed literally in the center of the entire drawing area, but when the drawable number is 4, FIG.
As shown in (B), it differs depending on which of the four divided areas the designated point is. In the example shown, M
Since the designated point exists in the area 0a, it is drawn in the lower right area of the entire drawing area.

Next, in step 110, peripheral map data, that is, M1 to M8 in FIG. 4 and M1 to M3 in FIG. 5B are drawn around the designated map data M0 in the entire drawing area. Then, finally, in step 112, control is performed so that the map 10 of the area having the designated point (x mark) as the center of the display screen is displayed on the display 4.

Although one embodiment of the present invention has been described above, of course, the present invention is not limited to this, and it is easy for those skilled in the art to devise various embodiments. For example, the number of screens drawn in the memory could be changed variously.

[0015]

As described above, according to the present invention, the designated point in the index is displayed in the center of the display screen to facilitate understanding of the surrounding conditions of the designated point. There is an effect that is done. That is, the serviceability of the navigation system is further improved.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing a hardware configuration of a navigation system according to an embodiment of the present invention.

FIG. 2 is a schematic flowchart showing a processing procedure of a main microcomputer.

FIG. 3 is a schematic flowchart showing a procedure of an interrupt process by a key operation during index display, which is one of the switch processes.

FIG. 4 is a diagram for explaining processing in a case where nine display screens can be drawn on the memory.

FIG. 5 is a diagram for explaining processing in the case where four display screens can be drawn on the memory.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Operation key 2 ... Main microcomputer 3 ... Display drive circuit 4 ... Display 5 ... CD-ROM microcomputer 6 ... CD-ROM decoder 7 ... CD-ROM 8 ... Communication interface

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Kazumi Miyazaki, Inventor Kazumi Miyazaki, 1-2-2 Gosho-dori, Hyogo-ku, Kobe, Hyogo Prefecture, Fujitsu Ten Limited (72) Inventor Takako Fukuda 1-chome, Gosho-dori, Hyogo-ku, Hyogo Prefecture No. 2 to 28 in Fujitsu Ten Limited

Claims (1)

[Claims] 1. An operating unit for a user to specify execution of a desired function, a reading unit for reading out the map data and the index data from a storage medium containing the map data and index data for the points, and the reading unit. A navigation system comprising display means for displaying the issued map data and index data, wherein the operation means designates to display a map for a specific point in the index displayed on the display means. In this case, the designated map data, which is the map data for one screen including the designated point, and the peripheral map data, which is the map data for a plurality of screens around the designated map data, are also read from the reading means, and the designated A navigation system for displaying a map of an area in which a point is the center of the display screen of the display means by the display means. Display control method of the definitive map.