JPH0458034B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for displaying a navigation map in a navigation system installed in a vehicle, in which the vicinity of the vehicle's current location is displayed in detail on a large scale. The present invention relates to a method for displaying a navigation map in which the remaining portions are displayed as a rough road display.

[Prior art]

A conventional navigation map display method displays a map at a uniform scale over the entire display screen. In this case, the scale was set arbitrarily within a certain range, or by selecting one of several scales.

[Problem to be solved by the invention] When the screen displayed using the conventional navigation map display method is set to a large scale, the area included in the display screen is small, making it difficult to select a road to the destination. It had the disadvantage of being difficult. On the other hand, if the scale is set to a small scale, the road leading to the destination can be seen, but the detailed situation of intersections near the current location is not clear.

Therefore, the present invention has been made with the aim of solving the problems of the prior art described above.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a map display method for a navigation system installed in a vehicle, in which the display screen for displaying the navigation map is divided into three zones, and A navigation map characterized in that a zone near a point is displayed on a large scale, a zone far from the vehicle's current location is displayed on a small scale, and a zone between the two zones is a zone connecting both zones. It is configured as a display method.

[Effect]

When the navigation map display method configured as described above is used, detailed roads are displayed in the vicinity of the current location of the vehicle, and general roads are displayed in other areas. Therefore, you can check both the detailed situation of intersections near the vehicle's current location and the current location on the wide-area map at the same time, and the connections between them are also displayed, so you can easily see the destination. You can clearly understand the road to the destination.

〔Example〕

Hereinafter, embodiments embodying the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
It should be noted that the following examples are examples embodying the present invention, and are not intended to limit the technical scope of the present invention.

FIG. 1 shows a screen displaying a map using the method of the present invention. The process leading to the display screen shown in FIG. 1 involves data processing of the nearby zone 1 shown by the first arrow 4 shown in FIG. 2, data processing of the far zone 2 shown by the second arrow 5, and both. This is done through the stages of data processing of the connection zone 3 to be connected. The outer edge of the near zone and the inner edge of the far zone processed and displayed in this way are set in advance based on an appropriate ratio to the screen size, and FIG. 3 shows the data processing procedure. This is shown using a float chart. In the following explanation, P1, P2, . . . indicate processing procedure (step) numbers.

The data processing indicated by the first arrow 4 in FIG. 2 has the following steps.

First, read and hold the current location X (latitude, longitude) (P1). Next, the map data of the area including the current point X is read and held (P2). The coordinates of the neighborhood zone 1 centered on the current point X are transformed so that it corresponds to the large scale (P3). This data
The data is converted into VRAM (video RAM) data to create image display data 1a of neighboring zone 1 (P4).

Next, the data processing indicated by the second arrow 5 in FIG. 2 has the following procedure.

The coordinates of distant zone 2 centered at the current point X are converted to correspond to the small scale (P5). This data is converted to VRAM data to create image display data 2a for far zone 2 (P6). The outer edge of the near zone and the inner edge of the far zone processed and displayed in this way can be arbitrarily selected in advance according to the screen size.Next, connect the near zone 1 and far zone 2. Display data of connection zone 3 to be processed is processed. That is, the outer end point of the road of the image display data 1a of the nearby zone 1 and the image display data 2b of the far zone 2
The inner endpoint of the road in the corresponding registered road
Create VRAM data so that each number is connected in a straight line, and complete data processing for image display of connection zone 3 (P7).

An example of the scales and roads used in the above three zones is, for example, in the image display data 1a of neighborhood zone 1, the large scale is 1/12500, and the road to be selected is one with a width of 2.5 m or more. do. Also, image display data 2a of far zone 2
In this case, the small scale is 1/50000, and the roads to be selected are those with a width of 5.5 meters or more. Next, the connection zone 3 has a width of 5.5 of the display data 1a.
A road display with a width of m or more and a road display with a width of 5.5 m or more in the image display data 2a are connected for each corresponding registered road number. In the above example, the size and scale of each zone displayed as an image can be arbitrarily selected.

〔Effect of the invention〕

According to the present invention, in a method for displaying a map used in a navigation system installed in a vehicle, when displaying a navigation map,
The display screen is divided into three zones, the zone near the vehicle's current location is displayed at a large scale, the zone far from the vehicle's current location is displayed at a small scale, and the zone between the two zones connects both zones. A method for displaying a navigation map is provided.

If this navigation system map display method is used, the area around the vehicle's current location is displayed in detail on a large scale, making it easy to understand the conditions of intersections, bridges, etc. In addition, the part far away from the current location of the vehicle becomes a small-scale map that shows a wide area, and the part between the above-mentioned large-scale and small-scale maps shows the connection of main roads, so the area where the vehicle is currently driving is shown. You will be able to understand a wide range of destinations on the roads you are traveling on.

[Brief explanation of the drawing]

Fig. 1 is a state diagram of a screen displaying a map using the method of the present invention, Fig. 2 is a state diagram of display screen information before and after data processing, and Fig. 3 is a flowchart of an embodiment of the present invention. It is. Explanation of symbols, X...Current location, 1...Nearby zone, 1a...Image display data of nearby zone, 2...
...Far zone, 2a... Image display data of far zone, 3... Connection zone, 4... First arrow, 5
...Second arrow.

Claims (1)

[Claims] 1. In the map display method for the navigation system installed in a vehicle, the display screen that displays the navigation map is divided into three zones, and the zone near the vehicle's current location is displayed at a large scale. A method for displaying a navigation map, characterized in that a zone far from the vehicle's current location is scaled down, and a zone between the two zones is a zone connecting the two zones.