JP3452672B2 - Map display control method and map display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map display method and a map display device capable of displaying on a display device a road map within a range from a set present location to a destination.

[0002]

2. Description of the Related Art When a road map is displayed on a display device, a road map is displayed in a so-called bird's-eye view display format in which the road map around the vehicle's current location is displayed in an enlarged manner compared to a distance. Is known (see, for example, Japanese Patent Laid-Open No. 2-244188). The device disclosed in the above publication places a viewpoint behind the current position of the vehicle and displays a state in which the traveling direction of the vehicle is looked down from this viewpoint on the screen of the display device. When such a bird's-eye view display is performed, the map information around the current location can be enlarged and displayed, and a wide range from the current location to the distant area can be displayed, so that the connection status of the road map can be visually easily grasped. Further, it is possible to display a road map with a realistic sensation as if the driver himself is looking down on the road map.

[0003]

However, when there is originally little road map information to be displayed on the screen, for example, when an area other than the urban area is displayed, is a bird's-eye view displayed or a plane similar to the conventional one? It is difficult to distinguish whether the map is displayed or not, and even if the bird's-eye view is displayed, there is a possibility that the original characteristic of the bird's-eye view cannot be obtained. Further, when the road map is displayed in a bird's-eye view, the map scale continuously changes from the lower side to the upper side of the screen, which makes it difficult to grasp the sense of distance of the road map on the screen.

An object of the present invention is to display a bird's-eye view of a road map on a display device, for example, to display a grid line or the like.
An object of the present invention is to provide a map display method and a map display device in which a sense of distance can be easily grasped by displaying a number line in a superimposed manner and a more realistic bird's-eye view can be displayed.

According to the invention of claim 1, in the vicinity of the present location of the moving body,
The location where the map is displayed on the screen of the display device in a larger scale than in the distance.
It is applied to the map display control method,
A mark indicating the direction of travel is displayed, and the map also shows distance.
Display multiple lines to make it easier to grab
Display the distance between each line next to each line and display multiple lines.
Is based on the current location of the mobile
It is characterized in that it is displayed according to the distance.
According to the invention of claim 2, the map around the present location of the moving body
How to control map display by enlarging and displaying on the screen of the display device
It is applied to the law and displays the current location and moving direction of the moving object on the map.
Mark is displayed and it is easy to get a sense of distance on the map.
To display multiple lines, and the distance between each line of the multiple lines.
It is characterized in that the display shows the distance. Contract
The invention of claim 3 is that the map around the current location of the moving body is viewed from a distance.
Map display control method that magnifies and displays on the screen of the display device
Applied to the map to show the current location and direction of travel of the mobile
Along with displaying the mark, it makes it easier to get a sense of distance on the map.
Display multiple lines, and then each line beside each line of multiple lines
It is characterized by displaying the distance interval of
is there. The invention of claim 4 is based on the plan map data,
Enlarge the map around the current location more than distantly and display screen
It is applied to the map display control method displayed on the
A mode that displays a map of the area around the ground on the screen in an enlarged manner compared to a distance.
The map around the current location of the mobile and mobile objects is enlarged from the distance.
Select the simultaneous display mode to display the map and the flat map at the same time.
Selectively execute the map of the current location of the moving body rather than distant
It was displayed in the map of the expansion mode and the simultaneous display mode.
A larger map of the current location of the mobile unit than from a distance
To display multiple lines that make it easier to get a sense of distance.
It is a feature. The invention of claim 5 is the present invention of a moving body.
Enlarge the map around the area from the far side and display it on the screen of the display device.
It is applied to the map display control method to be displayed,
While displaying the mark indicating the current location and the direction of travel,
Multiple lines are displayed on the diagram to help you grasp the sense of distance and displayed on the screen.
If you change the map range shown, the changed map
Change the display position of the line to make it easy to grasp the sense of distance depending on the range
It is characterized by the addition. Invention of Claim 6
Is the map display control method according to claim 1.
In, multiple lines that make it easier to grasp the sense of distance are
Even if it is rewritten, it will be displayed in the same position on the screen.
It is a feature. The invention of claim 7 is from claim 1 to
In the map display control method according to any one of 6,
Is characterized by being a grid line.
It The invention of claim 8 is a road map around the present location of the vehicle.
Suitable for a map display method in which
Used on the road map to show the current location and direction of travel of the vehicle
Along with displaying the mark, latitude and longitude lines are displayed on the road map.
Is displayed.

The invention of claim 9 is based on the plane map data.
A display device enlarging the map around the current location of the vehicle from a distance
It is applied to the map display control method displayed on the screen of
Enlarge the map around the current location of
Mode and the map around the current location of your vehicle
Simultaneous display mode that simultaneously displays a large map and a flat map
To execute a map to selectively display a map around the current location of your vehicle.
Display in a map and a simultaneous display mode that are larger than
Expanded the map around the present location of the vehicle
It is also characterized by displaying latitude and longitude lines on the map.
Of. According to the invention of claim 10, in the vicinity of the present location of the moving body,
The location where the map is displayed on the screen of the display device in a larger scale than in the distance.
It is applied to the figure display device, and the current location and progress of the moving body is displayed on the map.
A mark indicating the direction is displayed and a sense of distance is grasped on the map.
Display multiple lines to make it easier to see
Providing display control means for displaying the distance interval
It is characterized by. The invention of claim 11 is an own vehicle.
Enlarge the road map around the current location of the
It is applied to the map display device shown, and the current vehicle is displayed on the road map.
Marks showing the location and direction of travel and displaying the road
Equipped with display control means for displaying latitude and longitude lines on the map
It is characterized by that.

The configuration of the present invention has been described above.
But the present invention is not limited to the examples.

[0008]

【Example】

First Embodiment FIG. 1 is a block diagram of a first embodiment of a vehicle map display device according to the present invention. In FIG. 1, reference numeral 1 denotes a current position detection device that detects the current position of the vehicle, such as a direction sensor that detects the traveling direction of the vehicle, a vehicle speed sensor that detects the vehicle speed, and a GPS from a Global Positioning System (GPS) satellite.
It is composed of a GPS sensor or the like for detecting a signal. Reference numeral 2 is a map storage memory for storing road map data, such as a CD-
It consists of a ROM and its reading device. The road map data stored in the map storage memory 2 is mainly road data,
It consists of name data and background data.

Reference numeral 3 is a control circuit for controlling the entire apparatus,
It consists of a microprocessor and its peripheral circuits. Reference numeral 4 is an input device for inputting the destination of the vehicle, etc., 5 is a plane map data memory for storing road map data used when a plane map of the road map viewed from directly above is displayed on the display device 6,
Is a bird's-eye view data memory that stores road map data used when displaying a bird's-eye view of a road map. An image memory 7 stores image data to be displayed on the display device 8. The image data stored in the image memory 7 is appropriately read and displayed on the display device 8. Reference numeral 9 denotes a grid line information storage memory that stores information about the grid lines displayed on the display device 8, and stores information such as display position coordinates of the grid lines on the screen and display line types of the grid lines.

FIG. 2 is a diagram showing an example of grid lines displayed at the same time when a road map is displayed in a bird's eye view. Each grid line is displayed so that the distances between adjacent grid lines on the road map are approximately equal. To be done. When the road map is displayed in a bird's-eye view, the map scale changes continuously, and as shown in the figure, the grid line intervals gradually decrease from the upper side to the lower side of the screen. Similarly, the distance between the grid lines gradually decreases from the center of the screen to the left and right sides of the screen. Information for displaying the grid lines shown in FIG. 2 is stored in advance in the grid line information storage memory 9 described above. The numbers displayed on the side of the screen in FIG. 2 indicate display position coordinates when the lower left corner of the screen is the origin, and the triangular mark in the screen indicates the current position of the vehicle.

FIG. 3 is a flow chart showing the main processing of the control circuit 3, and the operation of the first embodiment will be described below based on this flow chart. The control circuit 3 is
Fig. 3 when the key is operated to the ignition on position
The process of is started. In step S1 of FIG. 3, a recommended route and a destination are set. The destination is set by the operator via the input device 4, and the recommended route is automatically set by calculation using, for example, the well-known Dijkstra method. Alternatively, the recommended route candidates may be stored in advance in the ROM or the like, and any one of them may be selected as the recommended route.

In step S2, the display screen mode is set. The display screen modes set here include a mode for displaying a bird's-eye view of a road map, a mode for displaying a plan map, and a mode for simultaneously displaying a bird's-eye view and a plan map on the same screen. Selection of these modes Is performed by the operator via the input device 4. When the bird's-eye view and the plan map are displayed at the same time, one of the road map display areas is displayed in a large size, and the other is displayed in a window in part. Hereinafter, the larger display area is referred to as the base screen, and the window display is referred to as the window screen.

In step S3, the display environment is set.
The display environment set here, for example, the display color of the screen,
There is a map scale etc. of the road map displayed. The operator selects these display environments via the input device 4. In step S4, the current position of the vehicle is detected. In step S5, a map display process whose details are shown in FIGS. Details of the map display process will be described later.

In step S6, the current position of the vehicle is detected as in step S4. In step S7, it is determined whether or not the road map on the screen is updated, that is, whether or not the road map is rewritten. Here, it is determined that the road map is updated, for example, when the vehicle travels for a predetermined distance or more, or when the operator instructs scrolling through the input device 4.

If the determination in step S7 is affirmative, the process returns to step S5, and if the determination is negative, the process proceeds to step S8. In step S8, it is determined whether to continue the main process of FIG. For example, if a power switch (not shown) is turned off or a switch for stopping the process is operated, the determination in step S8 is denied and the main process of FIG. 3 is ended.

When the determination in step S8 is affirmative, the process proceeds to step S9, the display of the attached information is updated, and then the process returns to step S6. Here, the attached information indicates, for example, a vehicle position mark displayed at the current position of the vehicle. In step S9, the display position of the accessory information such as the vehicle position mark is changed according to the traveling distance of the vehicle. When the vehicle position mark is displayed on both the base screen and the window screen, the display positions of both vehicle position marks are changed.

4 to 6 are flow charts showing details of the map display processing in step S5 of FIG. In step S101 of FIG. 4, it is determined whether the road map displayed on the base screen is a bird's-eye view. Here, the determination is made based on the display screen mode set in step S2 of FIG. If the determination in step S101 is positive, step S
In step 102, the bird's-eye view display process shown in detail in FIG. 5 is performed, and the bird's-eye view is displayed in the base screen display area on the screen.

On the other hand, if the determination in step S101 is negative, the process proceeds to step S103, the planar map display processing shown in detail in FIG. 6 is performed, and a bird's-eye view is displayed in the base screen display area on the screen. When the process of step S102 or S103 ends, the process proceeds to step S104 to determine whether to display the window screen. Here, the determination is made based on the display screen mode set in step S3 of FIG.

If the determination in step S104 is affirmative, the flow advances to step S105 to determine whether the road map displayed on the window screen is a bird's-eye view. This determination is also made based on the display screen mode set in step S2 of FIG. If the determination in step S105 is affirmative, the process advances to step S106 to perform a bird's-eye view display process whose details are shown in FIG. 5 and display the bird's-eye view in the window screen. On the other hand, if the determination in step S105 is negative, step S107
Then, the process proceeds to step 2 to execute the plane map display processing, the details of which are shown in FIG. 6, to display the plane map in the window screen.

When the process of step S106 or S107 is completed, or when the determination of step S104 is negative, the process proceeds to step S108, and the auxiliary information such as the vehicle position mark is displayed on both the base screen and the window screen. And return.

FIG. 5 is a flow chart showing details of the bird's-eye view display processing of step S102 of FIG. In step S201 of FIG. 5, the display direction angle when performing the bird's-eye view display is calculated.

FIG. 7 is a diagram for explaining a method of calculating the display direction angle α. The XY axes shown in the figure indicate the road map plane, the origin O indicates the starting point of the vehicle, the coordinates G (X0, Y0) indicate the current position of the vehicle, and the coordinates P1 (X1, Y1) indicate the destination. As shown in the figure, the display direction angle α is the angle between the X-axis and the line segment (the dotted line in the figure) connecting the current position G and the destination P1 and is represented by the equation (1).

Tan α = {(Y1−Y0) / (X1−X0)} (1) In step S201, the display direction angle α is obtained based on the equation (1).

In step S202, step S in FIG.
Road map data around the current position is read from the map storage memory 2 based on the current position detected in step 4 and the display direction angle α calculated in step S201. For example, the road map data of several 10 km square including the current location is read.

In step S203, step S202
Data to be used when displaying the bird's-eye view is selected from the road map data read in step 3, and the selected data is stored in the bird's-eye view data memory 6. Here, in order to reduce the data amount of the road map information displayed on the display device 8, only the data whose data type satisfies a predetermined condition is extracted and stored in the bird's-eye view data memory 6. In step S204, the road map data selected in step S203 is converted into bird's-eye view data.

FIG. 8 is a diagram for explaining the conversion to bird's-eye view data. The road map is the XY plane, the viewpoint M is placed on the Z axis orthogonal to the XY plane, and the view angle from the viewpoint M is φ.
Here is an example. The rectangle abcd shown in the figure shows the display range of the display device 6 as enlargedly displayed in FIG. 9, and the trapezoid ABCD of FIG. 8 shows the road map range displayed on the display device 6.

In order to convert the road map data into the bird's eye view data, the viewpoint M is first displayed so that all the road map data in the trapezoidal area ABCD shown in the figure can be displayed on the display device 6.
After defining the height Z, the down-looking angle φ from the viewpoint M, and the spread angle θ from the viewpoint, the bird's-eye view data projected on the rectangular area abcd in FIG. 8 is created using these parameters. At this time, the looking-down angle φ is set such that the vicinity of the center line connecting the midpoints of the upper side and the lower side of the display screen of the display device 6 becomes the destination direction.

Returning to FIG. 5, in step S205, the bird's-eye view data converted in step S204 is displayed on the display device 8.
Convert to final map image data for display in.
In step S206, the grid line information storage memory 9 reads the grid line information for bird's-eye view display shown in FIG.
Store in and return.

FIG. 6 is a flow chart showing the details of the plane map display processing in step S103 of FIG. In step S301 of FIG. 6, a road map around the current position of the vehicle is read from the map storage memory 2. In step S302,
From the road map data read in step S301, the data used for displaying the plane map is selected, the selected data is stored in the plane map data memory 5 as the plane map data, and the process returns. Here, FIG.
Similar to step S203, the high priority data or the like is selected. In step S303, the plane map data stored in the plane map data memory 5 is converted into map image data. In step S304, the grid line information storage memory 9 reads the grid line information for planar map display, synthesizes it with the map image data, stores it in the image memory 7, and returns.

FIG. 10 is a diagram showing a screen display example in the case of displaying a bird's-eye view in the first embodiment, and grid lines are indicated by dotted lines in the figure. 10A shows a display example before the vehicle moves, FIG. 10B shows a display example when the vehicle moves a predetermined distance in the traveling direction, and FIG. 10C shows a display example when the traveling direction of the vehicle changes significantly. Display examples are shown below. Figure 10
In any of (a) to (c), grid lines are displayed at the same position on the screen.

To summarize the operation of the first embodiment described above, the control circuit 3 sets the destination of the vehicle and the recommended route, and then sets the screen display mode and the display environment. On the other hand, the grid line information storage memory 9 stores grid line information for bird's-eye view display and planar map display in advance, and the control circuit 3 stores the grid line information according to the screen display mode selected by the operator. When selecting and displaying a road map, grid lines are displayed in an overlapping manner.

As described above, according to the first embodiment, when the road map is displayed on the display device 8, the grid lines are displayed for each predetermined distance on the road map. Therefore, even when the bird's-eye view is displayed. This makes it easier to grasp the sense of distance and can display a more realistic bird's-eye view. Further, since the display position of the grid line is always fixed, it is not necessary to rewrite the grid line even if the road map on the screen is scrolled, and the grid line can be displayed without affecting the screen rewriting speed.

Second Embodiment In the second embodiment, the latitude lines and longitude lines on the road map are displayed as grid lines. FIG. 11 is a block diagram of a second embodiment of the vehicle map display device. As shown in FIG. 11, the second embodiment is common to the first embodiment shown in FIG. 1 except that it has no grid line information storage memory. Of the various processes performed by the control circuit 3, only the bird's-eye view display process and the plan map display process are the first.
Since it is different from the above embodiment, the bird's-eye view display processing and the plan map display processing will be mainly described below. It is assumed that the map storage memory 2 of the second embodiment stores information about latitude and longitude on the road map.

FIG. 12 is a flow chart showing the bird's-eye view display processing of the second embodiment. Step S40 of FIG.
The processing of S1 and S402 is the same as steps S201 and S20 of FIG.
It is common with 2. In step S403, information about latitude and longitude stored in the map storage memory 2 (hereinafter referred to as latitude / longitude data) is read. Step S
At 404, road map data in the range displayed on the display device 8 is selected and stored in the bird's-eye view data memory 6. In step S405, the latitude / longitude data read in step S403 is converted into bird's-eye view data in order to display the latitude line and the longitude line on the screen.

In step S406, step S404
Convert the road map data selected in to bird's-eye view data.
In step S407, the bird's-eye view data converted in steps S405 and S406 is converted into map image data and stored in the image memory 7, and then the process returns.

FIG. 13 is a flow chart showing the planar map display processing of the second embodiment. Step S50 of FIG.
1 and S503 are the same as steps S301 and S30 in FIG.
It is common with the process of 2. In step S502, the latitude / longitude data stored in the map storage memory 2 is read. In step S504, the road map data selected in step S503 and the latitude / longitude data read in step S502 are converted into map image data and converted into image memory 7.
After storing in, return.

FIG. 14 is a diagram showing an example of a screen display when a bird's-eye view is displayed in the second embodiment, and the grid lines shown by the dotted lines in the figure represent latitude lines or longitude lines on the road map. FIG. 14A shows a display example before the movement of the vehicle, and FIG.
14B shows a display example when the vehicle has moved a predetermined distance in the traveling direction, and FIG. 14C shows a display example when the traveling direction of the vehicle has changed significantly.

In this embodiment, as a general rule, the vehicle position mark is displayed at a predetermined position on the screen. Therefore, when the vehicle moves over a predetermined distance as shown in FIG. The road map range of is changed, and the display position of the grid line showing the latitude line and the longitude line is also changed with the change. When the road map range on the screen is rotated in accordance with the change in the traveling direction of the vehicle as shown in FIG. 14C, the display position of the grid line is also rotated according to the rotation.

In FIGS. 14A to 14C, symbols A, B, and C displayed on the right side of each screen indicate grid lines displayed in the left and right directions of the screen. These grid lines move to A1, B1, C1 in FIG. 14 (b), and move to A2, B2, C2 in FIG. 14 (c).

As described above, according to the second embodiment, since the latitude line and the longitude line on the road map are displayed as grid lines, the current position of the vehicle can be grasped more accurately. Further, when the road map range on the screen is changed, the display position of the grid line is also changed accordingly, so that it becomes easy to grasp the change distance of the moving distance and the traveling direction of the vehicle.

In the second embodiment, the latitude and longitude lines on the road map are displayed as grid lines, but it is possible to select how many units of latitude and longitude the grid lines are displayed. You may In the first embodiment, a scale may be displayed beside each grid line so that the distance between the grid lines can be seen. Also, in the second embodiment, it may be displayed how many latitudes / longitudes each grid line indicates. In each of the above embodiments, a plurality of display line types for each grid line may be provided and the grid lines may be displayed using a plurality of different display line types. For example, thin line grid lines may be displayed in units of several hundred meters, and thick line grid lines may be displayed in units of several kilometers.
Also, when displaying the bird's eye view, if the grid lines on the lower side of the screen are displayed thick and the grid lines on the upper side are displayed thin,
A more realistic road map can be displayed. In addition to the first and second embodiments, for example, the current position of the vehicle may be used as a reference and grid lines may be displayed according to the distance from the current position. In this way, it becomes easier to understand the distance from the current location.

In the embodiment configured as described above, the map storage memory 2 serves as road map storage means, the control circuit 3 serves as display control means, step S204 of FIG. 5 serves as bird's-eye view data conversion means, and the construction of FIG. In step S405, the grid line information storage memory 9
Corresponds to the grid line information storage means, respectively.

[0042]

As described in detail above, according to the present invention, for example, when a road map is displayed in a bird's-eye view, a plurality of lines such as grid lines are displayed so as to be overlapped. This makes it easier to display a more realistic bird's-eye view.

[Brief description of drawings]

FIG. 1 is a block diagram of a first embodiment of a vehicle map display device according to the present invention.

FIG. 2 is a diagram showing a display example of grid lines in the first embodiment.

FIG. 3 is a flowchart showing main processing by a control circuit.

FIG. 4 is a flowchart showing map display processing by a control circuit.

FIG. 5 is a flowchart showing a bird's-eye view display process of the first embodiment by the control circuit.

FIG. 6 is a flowchart showing the planar map display processing of the first embodiment by the control circuit.

FIG. 7 is a diagram illustrating a method of calculating a display direction angle of a bird's eye view.

FIG. 8 is a diagram illustrating conversion into bird's-eye view data.

9 is an enlarged view of the rectangular area abcd shown in FIG.

FIG. 10 is a diagram showing a screen display example when a bird's-eye view is displayed in the first embodiment.

FIG. 11 is a block diagram of a second embodiment of a vehicle map display device according to the present invention.

FIG. 12 is a flowchart showing a bird's-eye view display process of the second embodiment by the control circuit.

FIG. 13 is a flowchart showing a planar map display process of the second embodiment by the control circuit.

FIG. 14 is a diagram showing a screen display example when a bird's-eye view is displayed in the second embodiment.

[Explanation of symbols] 1 Current location detector 2 map storage memory 3 control circuit 4 input device 5 Memory for plane map data 6 Bird's eye view data memory 7 Image memory 8 display devices 9 Grid line information storage memory

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G06T 11/60-11/80 G06T 17/50 G01C 21/00-21/36 G01C 23/00-25 / 00 G08G 1/00-1/16 G09B 29/00-29/10

Claims (11)

(57) [Claims] 1. A map display control method for displaying a map around a current position of a mobile unit on a screen of a display device by enlarging it from a distance, and displaying a mark indicating the current position and traveling direction of the mobile unit on the map. In addition, a plurality of lines are displayed on the map to make it easier to grasp a sense of distance, and the distance between the lines is divided beside each line of the plurality of lines.
And a plurality of lines are displayed based on the current position of the moving body.
A map display control method characterized in that it is displayed according to the distance from the current location of the moving body . 2. A map of the current location of a mobile unit is expanded from a distance.
It is a map display control method that is displayed on the screen of the display device.
I mean A map showing the current location and traveling direction of the mobile unit on the map.
It is easy to get a sense of distance on the map while displaying
Display multiple lines, Furthermore, a display that shows the distance between each of the plurality of lines is displayed.
A map display control method comprising: 3. A map of the current location of the mobile unit is expanded from a distance.
It is a map display control method that is displayed on the screen of the display device.
I mean A map showing the current location and traveling direction of the mobile unit on the map.
It is easy to get a sense of distance on the map while displaying
Display multiple lines, Further, beside each line of the plurality of lines,
A map display control method characterized by displaying in a light color. 4. A map display control method for displaying on a screen of a display device a map around a current location of a moving body in an enlarged manner from a distant place based on planar map data, wherein the map around the current location of the moving body is displayed farther than away. A mode for enlarging and displaying on the screen and a simultaneous display mode for simultaneously displaying a map enlarging the vicinity of the current position of the moving body from a distance and a plane map are selectively executed, and a map around the present position of the moving body. The map in the mode of enlarging the area from a distance and the map around the current location of the moving body displayed in the simultaneous display mode, which is enlarged from the distance, are displayed with a plurality of lines that make it easier to grasp the sense of distance. How to control map display. 5. A map around the current location of the mobile unit is expanded from a distance.
It is a map display control method that is displayed on the screen of the display device.
Therefore, the map indicates the current position and the traveling direction of the moving body.
It is easy to get a sense of distance on the map while displaying
When displaying a plurality of lines and changing the map range displayed on the screen, a map display characterized by changing the display position of the line that makes it easier to grasp the sense of distance according to the changed map range Control method. 6. The map display according to claim 1.
In the control method, the plurality of lines that make it easier to grasp the sense of distance are displayed at the same position on the screen even if the map is rewritten, and the map display control method. 7. The map display according to claim 1.
In the control method, The plurality of lines are grid lines
Map display control method. 8. A map display method for displaying on a screen a road map around the present location of the own vehicle in an enlarged manner from a distance, and displaying a mark indicating the present location and traveling direction of the own vehicle on the road map. A map display control method, wherein latitude lines and longitude lines are displayed on the road map. 9. A map display control method for displaying on a screen of a display device a map around the present location of the own vehicle by enlarging the map around the present location of the own vehicle from the plane map data. A mode of enlarging and displaying on the screen and a simultaneous display mode of simultaneously displaying a map enlarging the map around the current position of the own vehicle from a distance and a plane map are selectively executed, and a map around the present position of the own vehicle. A map display control method characterized in that a latitude line and a longitude line are displayed on a map in which the map around the present location of the vehicle displayed in the simultaneous display mode is displayed in a mode in which <br/> Law. 10. A map display device for displaying a map around a current position of a mobile unit on a screen of a display device by enlarging the map from a distance, and displaying a mark indicating the current position and traveling direction of the mobile unit on the map. At the same time, a plurality of lines are displayed on the map to make it easier to grasp the sense of distance, and the distance between the lines of the plurality of lines is further displayed.
Septal map display device characterized by Ru comprising a display control means for displaying the seen. 11. A map display device for displaying, on a screen, a road map around the present location of the own vehicle in an enlarged manner from a distance, and displaying a mark indicating the present location and traveling direction of the own vehicle on the road map. , <br/> map display device characterized by comprising a display control means for displaying the latitude and longitudinal lines in the road map.