JPH09288796A - Map display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely distinguish and read a road and traffic jam information from a display picture by narrowing an interval between the road and a traffic jam information displaying line with reducing a scale so as to eliminate the overlapping of the other roads and the traffic jam information displaying line. SOLUTION: A prefecture road 4 is displayed by a single line and traffic jam information lines U and L are displayed both sides of it. In this case the traffic jam information lines U and L are displayed in red for a jamming place, in yellow for a congested place and in green for a place without jam and congestion. Then the interval between the traffic jam information lines U, L and a line showing the road caries according to its map scale. Namely corresponding to the scaling ratio, the smaller the scale is, the narrower the interval between the road and the traffic jam information lines U and L is made. For example, when both of them are separated by four dots on the picture from a line R4 in a road map when the scale is 1/10000 and separated two dots on the picture from the line R4 in a road map when the scale is 1/80000.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention displays a traffic congestion information display line on both sides of a road displayed on a monitor at predetermined intervals with the road, and displays a specific color according to the degree of traffic congestion. The present invention relates to a map display device.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open Publication No.
A map display device for displaying on a map traffic congestion information transmitted from multiple broadcast radio waves is disclosed. There is also known a map display device that displays traffic congestion information transmitted from an optical beacon or a radio beacon on a map. In this case, a traffic congestion information display line is formed on both sides of the road on the map at predetermined intervals with respect to the road, and the traffic congestion information display lines are displayed in different colors according to the received traffic congestion information.

[0003]

The scale factor of the road map displayed on the monitor is, for example, 1/10000 to 1/8.
Approximately 0000, and if the distance between the congestion information display line displayed on both sides of the road and the road is the same regardless of the scale, the smaller the scale is, the closer the distance between the road and the road is. It may be difficult to determine whether it is an information display line or another normal road.

Further, when forming a traffic congestion information display line on both sides of a road along a road at a predetermined interval, a wire parallel to the link is formed for each link that defines the road, and those wires are formed. If the method of sequentially connecting the traffic congestion information display lines is adopted, there is a risk that the traffic congestion information display lines may not be continuous or intersect at an intersection or a curve.

It is an object of the present invention to provide a map display device in which the congestion information display line is not mistakenly determined to be a road even if the scale is reduced. Another object of the present invention is to provide a map display device in which traffic congestion information display lines are continuously displayed without intersecting at intersections and curves.

[0006]

[Means for Solving the Problems]

(1) According to the present invention, a road map is displayed on a monitor based on map data stored in a map storage device, a vehicle position is detected and displayed on a road map, and traffic information is received and displayed on a monitor. It is applied to a map display device that is adapted to display. The invention of claim 1 further comprises a traffic jam information display line creating means for creating a traffic jam information display line on both sides of the road displayed on the monitor at predetermined intervals with the road,
On the basis of the received traffic jam information, a color-coding means for giving a predetermined color to the traffic jam information display line according to the degree of traffic jam is provided, and the smaller the scale ratio according to the scale ratio of the map to be displayed, the smaller the scale ratio. The above object is achieved by reducing the distance between the road and the traffic congestion information display line. (2) Further, the invention of claim 2 is a line formed along both sides of the road displayed on the monitor at predetermined intervals from the road, and is divided based on the shape of the road. Congestion information display line creating means for creating a congestion information display line formed by connecting at least two strands, and the congestion information display with a predetermined color according to the degree of congestion based on the received congestion information. The color coding means for giving the lines and the judging means for judging whether the two strands are cut or intersecting at a place where at least two strands are connected to each other are provided. When it is determined whether the strands are cut or intersect, the creating unit continues the two strands at the connecting point, or performs a correction process to remove the intersecting portion of the intersecting strands to congest the traffic. By creating the information display line,
Achieve the above objectives.

[0007]

1 is a block diagram of an embodiment of a map display device according to the present invention. In FIG. 1, 1
Is a current position detection device that detects the current position of the vehicle, such as a direction sensor 1a that detects the traveling direction of the vehicle, a vehicle speed sensor 1b that detects the vehicle speed, and a GPS (Global Positioning S
ystem) A GPS sensor 1c for detecting GPS signals from satellites. Reference numeral 2 is a map storage memory for storing data relating to a flat road map, which is composed of, for example, a CD-ROM and its reading device. The road map data stored in the map storage memory 2 mainly includes road data on a planar map, name data, background data, and the like.

Reference numeral 3 is a control circuit for controlling the entire apparatus,
It consists of a microprocessor and its peripheral circuits. Reference numeral 4 denotes an input device having various switches for inputting the destination of the vehicle and the like, and in this example, it is arranged around the display screen. As a remote control method, a command may be sent to the control circuit wirelessly or by wire. The detail / wide area switches 4a and 4b are switches for displaying the display map in detail and displaying a wide area. In this example, it is possible to switch from the most detailed to the widest area in 5 steps, and in the case of bird's-eye view map display, the height of the viewpoint is 350 m for each step,
It is set to 700m, 1400m, 2800m and 5600m. The scroll switch 4c is for scrolling the display screen up and down, and various types of switches can be used, and a so-called joystick may be used. A scroll switch for changing the looking-down direction around the current position can be provided, and in this case, the screen can be scrolled not only in the vertical direction but also in the rotating direction. The input device 4 is provided with other map switches 4d and various switches (not shown). Further, various touch panel switches are set on the display screen of the display monitor 8 in the present embodiment.

Reference numeral 5 is a plane map data memory for storing plane road map drawing data for displaying the plane road map viewed from directly above, which is created based on the plane road map data read from the map storage memory 2. To be done. Reference numeral 6 denotes a bird's-eye view map data memory for storing bird's-eye view map drawing data for displaying the plane road map in a bird's-eye view method, which is created based on the plane road map data read from the map storage memory 2. An image memory 7 stores image data to be displayed on a display monitor 8 which will be described later, and this image data is created from plane map drawing data or bird's eye map drawing data and graphic data of various traffic information described later. . The image data stored in the image memory 7 is appropriately read and displayed on the display monitor 8.

Reference numeral 9 is an FM multiplex broadcast receiving device, 10 is an optical beacon receiving device, and 11 is a radio wave beacon receiving device. Traffic information (hereinafter referred to as VICS information) transmitted by an FM multiplex broadcast radio wave, an optical beacon, and a radio wave beacon, respectively. ) To receive.

The VICS information described in this specification includes traffic congestion information, regulation information, parking lot information, service area information,
This is parking area information. The regulation information includes lane regulation information, highway ramp regulation information, and interchange regulation information. The traffic congestion information is divided into upper and lower roads, and the traffic congestion is displayed in red, the congestion is displayed in yellow, and the congestion is not displayed in green.

FIG. 2 is a diagram showing an image for displaying a road map in a bird's-eye view method.
CS information is not displayed. TM is a vehicle position mark displayed on the current ground of the vehicle. During traveling, the map is not updated until the vehicle travels for a predetermined distance, and the vehicle position mark TM is moved upward from the reference position in FIG. The screen is updated when the vehicle travels for a predetermined distance or longer, and the vehicle position mark
Returns to the reference position in FIG. R1 is a toll road (highway), and R2 is a general road such as a national road or a prefectural road.

As shown in FIG. 2, in the present embodiment, the display range of the display monitor 8 is divided into four areas. When the X-axis direction of the display screen of the display monitor 8 is, for example, 500 dots, the Y-axis direction is 400 dots, and the lower left corner of the screen is the origin of the coordinates, the first region among the four regions is the Y-axis direction coordinates. Is in the range of 0 to 200 dots, the second region is in the range of 200 to 300 dots in the Y axis direction, the third region is in the range of 300 to 350 dots in the Y axis direction, and the fourth region is in the Y axis direction. The coordinates are in the range of 350 to 400 dots. The first to third areas are road map display areas, and the fourth area is an empty display area.

When the height of the viewpoint when creating the bird's-eye view map data is fixed, the narrow area around the current position is displayed in the first area in the most detailed and large scale, and the third area is displayed in the third area. A bird's-eye view map is displayed in a wide area of a point away from the current position at the coarsest and smallest scale, and a bird's-eye view map is displayed in the second area at an intermediate scale.
The scale ratio in the first area to the third area gradually decreases as the distance from the current location increases.

GH is a horizontal grid line and GV is a diagonal grid line, which expresses a perspective and a depth on a bird's-eye view map. Each grid line is displayed so that the distances on the road map between adjacent grid lines are approximately equal. When the road map is displayed by the bird's-eye view method, the map scale continuously changes from the lower side to the upper side of the screen, so that the interval between the horizontal grid lines GH becomes gradually narrower from the lower side to the upper side of the screen as shown in the figure. Similarly, the diagonal grid lines GV have narrower intervals from the center of the screen to the left and right.

FIG. 3 is a flow chart showing the main processing of the control circuit 3, and the operation of the present 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
Start the process. 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. In this case, the position detected by the current position detection device 1 can be used as the current position. Alternatively, recommended route candidates may be stored in advance in a 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 map and a mode for displaying a planar map.
The operator selects these modes through the input device 4 and the touch panel switch. In step S3, the display environment is set. The display environment set here includes, for example, the display color of the screen and the selection of the night mode and the daytime mode. The operator selects these display environments via the input device 4. In step S4, the current position of the vehicle is detected based on the signal from the current position detection device 1. Step S5
Then, the map is displayed by performing the map display processing whose details are shown in FIGS. Details of the map display process will be described later.

In step S6, the current position is detected in the same manner as in step S4. In step S7, it is determined whether or not to update the road map on the screen, that is, whether or not to rewrite the road map. Here, based on the detected current position, it is determined that the road map displayed on the screen is updated when the vehicle has traveled a predetermined distance or more since the previous map update. Note that this screen update is called scrolling by traveling distance, and is distinguished from screen scrolling by the scroll switch 4c.

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.

If the determination in step S8 is affirmative, the process proceeds to step S9, the display of the vehicle position mark is updated, and then the process returns to step S6. Although the own vehicle position mark is displayed so as to be superimposed on the current position on the map, the own vehicle position mark is moved on the map according to the traveling distance until the map is scrolled by a predetermined distance in step S7. The display of the position mark is updated. Other ancillary information is also updated in this step.

FIG. 4 is a flow chart showing details of the bird's-eye view map display process of the map display process of step S5 of FIG. In step S201, a display direction angle when a map is displayed by the bird's eye view method is calculated. In step S202, based on the current position detected in steps S4 and S6 of FIG. 3 and the display direction angle calculated in step S201,
Road map data around the current location is read from the map storage memory 2. For example, the road map data of several 10 km square including the current location is read.

In step S203, step S201
Data to be used when displaying the bird's-eye map is selected from the road map data read in step 3, and the selected data is stored in the bird's-eye map data memory 6. Here, in order to reduce the data amount of the road map information displayed on the display monitor 8, only the data whose data type satisfies a predetermined condition is extracted and stored in the bird's-eye view map data memory 6. Step S
In 204, the road map data selected in step S203 is converted into bird's-eye view map data. The well-known bird's-eye view method is used for data conversion. In step S205,
The bird's-eye view map data converted in step S204 is converted into final map image data to be displayed on the display monitor 8. If it is determined in step S209 that the VICS information display mode is set, the process proceeds to step S206, and if not, the process proceeds to step S207. Step S2
At 06, graphic information of VICS information, which will be described later, is converted into map image data. In step S207, the map image data and VICS graphic image data are stored in the image memory 7, and in step S208 the image is displayed on the display monitor 8.
To be displayed.

At the time of display, in the VICS information display mode, VICS character information is displayed so as to overlap the map and VICS graphic information. At this time, since the VICS character information includes the data providing time, the data providing time is displayed at the upper part of the screen to notify that the display screen is in the VICS information display mode. In addition, the background color and the like are switched as will be described later, depending on whether the VICS information display mode is selected or not selected.

FIG. 5 is a flow chart showing details of the planar map display processing of the map display processing of step S5 of FIG. In step S301, the road map data around the current location detected in steps S4 and S6 of FIG. 3 is read from the map storage memory 2. For example, several 10k including the current location
Read road map data of m squares.

In step S302, step S301
Data to be used when displaying the plane map is selected from the road map data read in step 3, and the selected data is stored in the plane map data memory 5. In step S303, the road map data selected in step S302 is converted into planar map data to be displayed on the display monitor 8. If it is determined in step S307 that the mode is the VICS information display mode, the process proceeds to step S304, and if not, the process proceeds to step S305. Step S30
At 4, the graphic information of VICS information, which will be described later, is converted into map image data. In step S305, the map image data and the VICS information image data are stored in the image memory 7,
In step S306, the image is displayed on the display monitor 8. At the time of display, in the VICS information display mode, VICS character information is displayed by being superimposed on the map and VICS graphic information. At this time, since the VICS character information includes the data providing time, the data providing time is displayed at the upper part of the screen to notify that the display screen is in the VICS information display mode.

The VICS information display processing will be described in detail with reference to FIGS. In this embodiment, the following display control is performed. There are display control by a function arbitrarily selected by the operator and display control appropriately performed by the apparatus itself.

Congestion information thinning-out display control In the bird's-eye view map display, all VICS information is displayed in the first and second areas of the screen, but in the third area, a red congestion information display line indicating a congested road. Indicates. Therefore, other VICS information is not displayed in the third area. This ensures the visibility of the screen.

Display Mode Selection Display Control 4 modes of displaying all VICS information on toll roads and general roads, displaying only VICS information on general roads, displaying only VICS information on toll roads, and not displaying VICS information It is possible to select the type of mode. This allows V as needed
The ICS information can be displayed, and operability and visibility are improved.

VICS information detailed display control When the detailed information display mode is selected when the regulation information and the parking lot information are in the displayed map, one of the information is surrounded by a square frame and the details of the enclosed information are displayed. It displays the text of certain regulations and parking space information. When there is a plurality of these pieces of information, the regulation information is preferentially displayed and can be sequentially selected by the item selection switch.

VICS Information Display Identification Display Control On the screen for displaying VICS information, the VICS information provision time is always displayed in the screen to notify that it is the VICS information screen, so that the congestion information can be surely grasped. .

Background color switching display control The use of colors in the screen when VICS information is not displayed is changed to that when VICS information is displayed, and traffic congestion information is displayed clearly on a road map. For example, the background color is reddish gray without VICS information display and bluish gray with VICS information display. For road colors,
Without VICS information display, national roads are red, prefectural roads, main local roads are green, and general road I is orange, but with VICS information display, all are blackish gray, and for narrow streets, VIC
When S information is not displayed, it is close to blackish gray, and when VICS information is displayed, it is close to the background gray, which is bluish gray. Toll roads are displayed in blue with or without VICS information display. further,
For green areas, VIC is green without displaying VICS information.
When S information is displayed, the color is a gray type that is slightly less saturated than the background color.

Congestion information display line width switching display control In the case of a flat map display, the display position of the congestion information display line is displayed further away from the road according to the scale factor of the map, as the scale factor increases. In the case of the bird's-eye view map, the more detailed the display, the farther from the road it is displayed according to the detailed wide area selection.
This prevents the congestion information display line from being mistaken for other roads when the scale is small or in wide area display.

Interpolation Display Control of Congestion Information Display Line When the congestion display line is displayed along the road, it is prevented from interpolating at intersections and curves to prevent discontinuous display, and avoid crossing.

The display control described above is performed only in the bird's-eye view map display mode, but is otherwise similarly performed in the planar map display mode.

Each of the above-mentioned display controls will be described below. When the map switch 4d is operated from the VICS information non-display screen of FIG. 2, the display screen of FIG. 6 is displayed.
When the VICS display touch panel switch 8a is operated, the display screen shown in FIG. 7 is displayed. In the upper display area D1 of the screen of FIG. 7, the prefecture name and the providing time of the VICS information are displayed. A general road information touch panel switch 8b and a toll road information touch panel switch 8c are displayed on the lower side of the screen. The VICS information display as shown in FIG. 8 is selected according to the on / off state of these touch panel switches 8b and 8c.

In FIG. 7, the general road information touch panel switch 8b is provided with an indicator 8d, and the toll road information touch panel switch 8c is provided with an indicator 8e. Each of the indicators 8d, 8e is provided with each of the switches 8b, 8c.
When turns on, it lights in green.

FIG. 9 is a flowchart showing the VICS information display processing. When it is determined in step S21 that the VICS information display mode is the general road information mode, step S21 is performed.
In step 22, the general road VICS information is read from the memory, and when it is determined in step S21 that the VICS information display mode is the toll road information mode, the toll road VICS information is read from the memory in step S23. In step S24, processing is performed to display these VICS information on the monitor 8. If it is determined in step S21 that the VICS information display mode is neither the toll road information mode nor the general road information mode, and it is determined in step S25 that both the general road VICS information and the toll road VICS information are displayed. General road V in step S26
The ICS information and the toll road VICS information are read from the memory and the process proceeds to step S24. When the step S25 is denied, it is a mode in which the VICS information is not displayed, and the process returns to the original without performing the illustrated VICS information display processing.

FIG. 10 is a detailed flowchart of the processing for processing the VICS information shown in FIG. In step S31, the start and end points of the upper and lower two lines are calculated along the link representing the road according to the detail / wide area level or the scale. In step S32, based on the received traffic congestion information, a traffic congestion section, a congestion section, and a section with no traffic congestion are identified for each of the calculated lines, and color information indicating the degree of traffic congestion is added to each of them to display the traffic congestion information. Create line data.

In step S33, display data is created based on the received parking lot information, regulation information, service area information, and parking area information.

FIG. 2 shows a screen without VICS information display, and FIG.
Is a VICS information display screen of a general road, FIG. 12 is a VICS information display screen of a toll road, and FIG. 13 is a VICS information display screen of a toll road and a general road.

In FIG. 11, congestion information display lines U and L are displayed on both sides of the general road R2. The display line U
Indicates traffic information on the up lane, and the display line L indicates traffic information on the down lane. When the entire section of points P1, P2, P3, P4 is also crowded with the upper and lower lines, the upper and lower display lines U and L are displayed in the same yellow color (indicated by a dashed line in FIG. 11) in the first area and the second area. However, the upper and lower lines are not displayed in the third area, and the visibility of the screen is prioritized. Since there are many roads and place names to be displayed in the back of the screen, the congestion display line and the congestion-free congestion display line are displayed in the third area in order to minimize the difficulty in viewing the display due to the increase in information data. Omit it. For the same reason, neither regulation information nor other VICS information is displayed in the third area. A mark PM indicating a parking lot is displayed in the first area.

In FIG. 12, congestion information display lines U and L are displayed on both sides of the toll road R1. Point P5, P
When the up lanes of all the sections of 6, P7 and P8 are congested and the down lanes are congested, the congestion display of the up lane congestion display line U in red (indicated by a broken line in FIG. 12) is the first area, Two
It is displayed in all of the area and the third area. On the other hand, regarding the traffic jam display line L of the down lane, the yellow color in the third area (see FIG. 12).
Do not display the traffic jam display (dashed line)
Only the area is displayed in yellow (one-dot chain line in FIG. 12) congestion display. This is for the same reason as the purpose of FIG.

In the VICS information display mode for the general road and toll road, the display screen is as shown in FIG.
1 and all of FIG. 12 are displayed. In the flat map display mode, the traffic jam information display line is not thinned out, but the others are the same as the bird's-eye view map display mode.

The roads displayed in the third area of the screen in the bird's-eye view map are toll roads, expressways, and national roads, and the road display is also thinned out. In addition, names are limited to prefectures and cities. Therefore, in combination with these thinning processing and display restriction processing, VIC
By the above-described thinning-out processing of the S information display, even if the VICS information is displayed, it is easy to see the map display of the third area.

FIGS. 14A and 14B are views for explaining the display of the detailed information display mode of the VICS information, and show the case where the lane regulation information VR and the parking lot information PM are present in the display screen. When the detailed information display touch panel switch (not shown) set on the monitor 8 is operated, first, as shown in FIG.
As shown in (a), the lane regulation information VR is surrounded by a rectangular frame FR, and a lane regulation character M1 and a lane regulation area name M2 are displayed in an area D2 at the bottom of the screen.

When it is desired to know the details of the parking lot PM, the touch panel switch 8 for selecting an item set on the screen is selected.
When f is operated, the display screen shown in FIG.
That is, the parking lot PM is surrounded by a rectangular frame FR, and the parking lot name M3 and the full car M4 are displayed in the display area D2 at the bottom of the screen.
Is displayed. When the end touch panel switch 8g set on the screen is operated, the screen returns to any one of FIGS. 2 and 11 to 13 according to the display mode.

FIG. 15 is a flow chart when the detailed information display mode of VICS information is selected. If it is determined in step S41 that there is regulation information on the display screen, step S4
Proceed to 2 and enclose any one of the regulation information in a square frame.
Next, in step S43, the detailed information of the enclosed regulation information is displayed in characters. Item selection switch 8 in step S44
If it is determined that f has been operated, the process returns to step S41.
If not operated, the end switch 8 is pressed in step S45.
When the operation of g is determined, this process is terminated, and when the operation of the end switch 8g is not determined, the process returns to step S44. If it is determined in step S41 that there is no regulation information, the process proceeds to step S46. When it is determined that there is parking lot information in step S46, one parking lot information is surrounded by a square frame in step S47, and further, in step S48, the parking lot name and information on whether the parking lot is full or vacant are displayed in characters and step Proceed to S44. If step S46 is denied, the routine proceeds to step S45.

Similar display is possible by selecting the detailed information display mode during the bird's-eye view display.

FIG. 16 is a diagram for explaining the traffic congestion information display line in detail. In FIG. 16, the national road R3 is displayed with two lines having a width (hatched), and the traffic congestion information display lines U and L are displayed on both sides thereof. Prefectural road R4 is 1
It is displayed as a book line, and traffic jam information display lines U and L are displayed on both sides of the line. That is, the method of creating the congestion information display line is slightly different depending on whether the road is represented by one line or two lines. In addition, congestion information display line U
And L, the congestion area is red (shown by the broken line in FIG. 16),
The congestion points are displayed in yellow (indicated by a one-dot chain line in FIG. 16), and the congestion-free areas are indicated in green (indicated by a two-dot chain line in FIG. 16).

It has been described above that the distance between the traffic congestion information display line and the line indicating the road is changed according to the map scale, but one example thereof is shown in FIGS. 17 and 18. (A) shows only the road, (b) shows the case of 1/80000, and (c) shows the case of 1/10000. For example, scale ratio 1/1
At 0000, it is separated from the road map lines R3 and R4 by 4 dots on the screen, and at scale ratios of 1/20000 and 1/40000, it is separated from the road map lines R3 and R4 by 3 dots on the screen (not shown), and the scale ratio 1 / At 80000, the road map line R3
2 dots away from R4 on the screen.

Next, the procedure for creating the congestion information display line will be described. One road as map data is defined by a plurality of lines called links each having a node at the start point and a node at the end point. The start point node and the end point node each have coordinate positions, and the link connecting them has road type information. Basically, the line that connects the start point (offset node) and the end point (offset node) after the offset is added or subtracted with the offset value (shift amount) in the X direction or the Y direction to the position coordinates of the node and the congestion information is displayed. Become a line. The magnitude and direction of the offset value are determined as follows.

A two-dimensional plane for displaying a map is shown in FIG. 19 (a).
As described above, the X axis and the Y axis are defined, and the counterclockwise rotation around the origin O is defined as a positive angle. When the inclination of the link is less than 45 degrees, the congestion information display lines Ua to Lb are offset in the Y direction as shown in FIGS. 19B and 19C. As shown in d) and (e), the congestion information display lines Uc to Ld are offset in the X direction. Further, the offset amount is determined so as to be separated from the road by 2 to 4 dots on the screen, as described above, according to the map scale ratio. 19B to 19E, L1 to L4 represent links, N1 to N4 represent nodes, and Ua and Uc represent traffic jam display lines of up lanes, Lb and Ld.
Indicates a traffic jam display line of a down lane, and ON1a to ON4b indicate offset nodes obtained by offsetting the respective nodes.

The traffic congestion information display line is determined as described above. When the links L1 and L2 are orthogonal to each other as shown in FIG. 20, the traffic congestion display lines Uc and Ua of the up lane are offset nodes ON4a and ON1a. I'm going away. In addition, the traffic jam display lines Lb and Ld of the down lane intersect.

Therefore, the following processing is performed to connect distant lines and erase the intersection of the intersecting lines. FIG.
In (a) and (b), the traffic congestion indication lines Ua and U
The intersection point UX of c is obtained, and the line connecting the intersection point UX and the offset node ON3a is a new upstream traffic jam display line Uc '.
Then, a line connecting the intersection UX and the offset node ON2a is set as a new upstream traffic jam display line Ua ′. On the other hand, the intersection LX of the traffic jam display lines Lb and Ld of the down lane is obtained, and the line connecting the intersection LX and the offset node ON3b is set as the traffic jam display line Ld ′ of the new down lane, and the intersection LX and the offset node ON2b are connected. The line is set as a traffic jam display line Lb ′ of a new down lane. By such correction calculation, continuous traffic congestion information display line data can be created according to the connection state of the link.

As shown in FIG. 22A, such an interpolation calculation is performed when the offset directions of the continuously connected links L1 and L2 are different in the X direction and the Y direction, as shown in FIG.
As shown in (b) or (c), even if the offset directions of the links L1 and L2 that are continuously connected are the same, it is necessary when the direction of the link L2 is reversed. Therefore,
As shown in FIGS. 22D and 22E, when the offset directions and directions of the links L1 and L2 that are continuously connected are the same, the interpolation calculation is unnecessary.

[0056]

【The invention's effect】

(1) According to the present invention, since the distance between the road and the traffic congestion information display line is narrowed as the scale is reduced, the possibility that the traffic congestion information display line overlaps with other roads is reduced, and It is possible to reliably distinguish between road information and traffic jam information. (2) According to the present invention, the traffic congestion information display line is corrected at the intersection or the curve so that the traffic congestion information display line is continuously displayed without being cut or intersecting.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a display example in a mode without VICS information display.

FIG. 3 is a flowchart showing main processing.

FIG. 4 is a flowchart showing a bird's-eye view map display process.

FIG. 5 is a flowchart showing a planar map display process.

FIG. 6 is a diagram showing a screen for setting VICS information display.

FIG. 7 is a diagram showing a screen in the middle of setting VICS information display.

FIG. 8 is a diagram illustrating selection of general road VICS information and toll road VICS information and display contents at that time.

FIG. 9 is a flowchart showing VICS information display processing.

FIG. 10 is a flowchart showing VICS information processing processing.

FIG. 11 is a diagram showing a display example in a mode with general road VICS information display.

FIG. 12 is a diagram showing a display example in a mode with toll road VICS information display.

FIG. 13 is a diagram showing a display example in a mode with a toll road and general road VICS information display.

FIG. 14 is a diagram illustrating a VICS information detailed display mode.

FIG. 15 is a flowchart of VICS information detail display processing.

FIG. 16 is a diagram showing a display example of a traffic jam information display line.

FIG. 17 is a diagram illustrating a distance between a traffic congestion information display line and a road.

FIG. 18 is a diagram illustrating a distance between a traffic congestion information display line and a road.

FIG. 19 is a diagram illustrating creation of a traffic jam information display line.

FIG. 20 is a diagram for explaining that the congestion information display line is cut and intersects.

FIG. 21 is a diagram illustrating an interpolation calculation of a traffic jam information display line.

FIG. 22 is a diagram for explaining the necessity of interpolation calculation of a traffic jam information display line.

[Explanation of symbols]

 1 Current Location Detection Device 2 Map Storage Memory 3 Control Circuit 4 Input Device 4a Detailed Switch 4b Wide Area Switch 4c Scroll Switch 5 Plane Map Data Memory 6 Bird's Eye Map Data Memory 7 Image Memory 8 Display Monitor 9 FM Multiplex Broadcast Receiver 10 Optical Beacon Receiver 11 Radio beacon receiver

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G09G 5/36 510 G06F 15/62 360

Claims (2)

[Claims] 1. A road map is displayed on a monitor based on map data stored in a map storage device, and a position of a vehicle is detected and displayed on the road map in an overlapping manner. In a map display device configured to display, a traffic jam information display line creating means for creating a traffic jam information display line on both sides of the road displayed on the monitor at predetermined intervals with the road, and received. And a color-coding means for assigning a predetermined color to the congestion information display line based on the congestion information according to the degree of congestion, and the smaller the scale ratio according to the scale ratio of the displayed map, the smaller the road A map display device characterized in that the interval between the traffic congestion information display lines is narrowed. 2. A road map is displayed on a monitor on the basis of map data stored in a map storage device, a vehicle position is detected and displayed on the road map, and congestion information is received and displayed on the monitor. In the map display device configured to display, lines which are formed on both sides of the road displayed on the monitor at predetermined intervals from the road, and which are divided based on the shape of the road. A traffic congestion information display line creating means for creating a traffic congestion information display line formed by connecting two wires, and a color predetermined according to the degree of traffic congestion based on the received traffic congestion information. And the color-coding means to be applied to the at least two strands are connected to each other.
And a determination unit that determines whether the two strands are cut or intersects. When the determination unit determines whether the two strands are cut or intersects, the creation unit is The map display device is characterized in that the traffic congestion information display line is created by performing a correction process of making two strands continuous at the connecting point or removing an intersecting portion of intersecting strands.