JP3355804B2 - Road map display device for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle road map display device for displaying a road map.

[0002]

2. Description of the Related Art Conventionally, in this type of apparatus, CDR
The map data is stored in a map data storage medium such as an OM, and a road map of the traveling road is displayed. Further, in addition to such a road map display, this one provides map matching (hereinafter referred to as MM) for positioning the current position of the vehicle on the road display, and route guidance for an optimal route to a predetermined destination. It has various functions such as performing.

Here, in the conventional map data storage medium, as shown in FIG. 7, display road data, MM road data, and route road data are stored, respectively. The display road data is composed of shape point information for displaying a road map, and attribute information such as information on road types (expressways, national roads, etc.), the number of road lanes, and restrictions on one-way traffic. The road data and the road data include shape point information for defining roads required for each function and network information (information on how road links are connected to other links, for example, link A is Link B, C, and D).

The road data is constructed for each function as described above. In this type of road map display device, commercialization starts from displaying a road map using display road data, and thereafter, commercialization is started. , MM, and route guidance are sequentially added, and data for such functions are sequentially added.

[0005]

Therefore, in the above-mentioned conventional apparatus, since the data for each display is stored individually, there is a problem that the total storage capacity becomes large. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has an object to reduce the storage capacity of the entire map data by sharing shape point information in such various types of display of a road map.

[0006]

According to the present invention, there is provided a map data storage medium (5) storing map data for displaying a road map. Display means for displaying a road map (6)
And a control means (4) for reading map data from the map data storage medium (5) and displaying a road map on the display means (6). (5), as the map data, the shapes of the road regulations with defining a plurality of road shape by a set of links specified by the coordinate points
Links with consecutive numbers for multiple links to be specified
In addition to storing shape point information having an ID, link ID information for specifying a link in the shape point information is stored for road maps in first and second different display forms, respectively . Link for display form 2
At least one of the ID information is the start and end link IDs
And the control means (4) has a start end and an end
Specify the link ID column between them by the link ID at the end
A road map in the display mode is displayed. When displaying the road map in the first display mode, a set of links in the shape point information is specified by link ID information for the first display mode, and The road map in the first display mode is displayed on the display means, and when displaying the road map in the second display mode, a set of links in the shape point information is specified by link ID information for the second display mode, and A road map in a second display form is displayed on the display means.

Here, the road map in the first display mode corresponds to a road map of a vehicle traveling road in the embodiment described later, and the road map in the second display mode corresponds to the MM in the embodiment described later. And / or a road map for route guidance .

[0008] The reference numerals in parentheses of the above means indicate the correspondence with the concrete means described in the embodiments described later.

[0009]

According to the first aspect of the present invention,
For the shape point information that defines the shape of the road, link ID information is provided for each of the first and second different display forms of the road map, and the shape point information is accessed by using the link ID information, and each of the road map Since the display is performed, the shape point information can be shared in the road map of each display mode, and the storage capacity of the entire map data can be reduced.

[0010] In the second aspect of the present invention,
By assigning link IDs to a plurality of links that define the shape of the road by serial numbers, only link IDs at the start and end are stored as link ID information.
The control means can specify a link ID string for a plurality of links constituting a road, and thus the storage capacity of the link ID information stored on the map data storage medium can be reduced.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is an overall configuration diagram of a vehicle navigation device showing an embodiment of the present invention. In FIG. 1, a vehicle signal generator 1 outputs a signal from a direction sensor, a gyro, or the like indicating a traveling direction of a vehicle and a signal corresponding to a traveling distance of the vehicle as a vehicle signal. The GPS receiver 2 outputs a GPS signal indicating the current position of the vehicle based on a signal received from a GPS satellite. The operation unit 3 is operated by an occupant and outputs various instruction signals necessary for navigation such as designation of a display map. A map data storage medium (hereinafter, referred to as CDROM) 5 stores map data for displaying a road map or the like.

The control device 4 calculates the current position based on the vehicle signal from the vehicle signal generator 1 and the GPS signal from the GPS receiver 2, reads out the map data from the map data storage medium 5 and centers the current position on the current position. Then, a road map is displayed on the display unit 6 together with the current position based on the created map data. The feature of this embodiment is that the map data stored in the CDROM 5 is
As shown in FIG. 2, the road ID data for display, the road data for MM, and the road data for route are associated with each other by the link ID information to share the shape point information. That is, access to the shape point information in each road data is enabled by the link ID information, and each road map is displayed.

The shape point information defines the shape of a road by a set of a plurality of links specified by two-dimensional coordinate points, and is defined in units of roads (strokes). Is stored. For example, on a road as shown in FIG. 3, the stroke S1 is determined by the links L1 to L3.
2 is composed of links L4 and L5, the link L1 is composed of coordinates p11 to P13, and the link L2 is composed of coordinates p.
13 to 16, the link L3 is constituted by coordinates p16 and P17, and the link L4 is constituted by coordinates p21, p22 and P1.
3, the link L5 is constituted by coordinates p13, p24, and p25.

Here, a link ID is assigned to each of the plurality of links, and the links L1 to L5 constitute the link ID. This link ID is assigned as a unique ID number to each link on roads nationwide, and is assigned as a continuous number within a stroke. FIG. 4 shows a schematic configuration of the display link ID information, the MM link ID information, and the route link ID information. FIG. 5 shows a display process of the control device 4 based on the ID information.

The link ID information for display includes the link IDs of the start and end of the link row in each stroke of the display road.
It is composed of When displaying the road, the control device 4 specifies a continuous link ID sequence between the start and end link IDs in each stroke, accesses the shape point information from the link ID sequence, and links the shape point information. Specify the set of That is, the coordinate points forming the link in each stroke are extracted. By linking the extracted coordinate points, a road map shown in FIG.

The MM link ID information includes a link ID and a pointer to network information. At the time of the MM, the control device 4 specifies the link ID of the currently traveling road and the link ID string of the traveling direction using the network information, and accesses the shape point information from the link ID string. Then, in the same manner as above, an MM map (a map for displaying finer roads finer than the above road display) is displayed as shown in FIG. This MM map is performed, for example, when the vehicle stops.

The route link ID information includes a link ID, a link cost, and a pointer to network information. At the time of route guidance, the control device 4 calculates an optimal route from the current location to the destination using the link cost and the network information, specifies the route as a link ID sequence, and accesses shape point information from the link ID sequence. I do. Then, in the same manner as above, a route map (for example, a display in which links on the route are highlighted) is displayed as shown in FIG.

In the network information for the MM, the connection link I stored in association with the link ID is stored.
The connection relationship between the links is defined by D, whereby the connection roads that constitute the MM map are displayed. The same applies to the network information for a route. However, regulation information such as one-way traffic is added, and the route is calculated in consideration of this. In addition, attribute information for display, and other network information for MM and route,
This is the same as the conventional one shown in FIG.

As described above, in the present embodiment, data transmission and reception can be performed using the link ID as a key, and only necessary data for each function is divided into blocks.
Data capacity can be reduced. Further, since the link IDs are consecutive numbers in the stroke, the link ID sequence between them can be specified only by specifying the start and end link IDs, and the data capacity can be further reduced.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention.

FIG. 2 is a data configuration diagram showing a schematic configuration of map data in a map data storage medium 5;

FIG. 3 is an explanatory diagram for explaining a configuration of shape point information;

FIG. 4 is a configuration diagram showing a data configuration for display, MM, and route.

FIG. 5 is a flowchart showing a process of a control device 4 for displaying roads for display, MM, and route.

FIG. 6 is a diagram showing road display examples for display, for MM, and for a route.

FIG. 7 is a data configuration diagram showing a schematic configuration of map data in a conventional map data storage medium.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle signal generation part 2 GPS receiver 3 Operation part 4 Control device 5 Map data storage medium 6 Display part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G09B 29/00-29/14 G01C 21/00-25/00

Claims (1)

(57) [Claims] 1. A map data storage medium storing map data for displaying a road map, display means for displaying a road map, reading map data from the map data storage medium, and displaying a road map on the display means. A vehicle road map display device comprising: a control unit for displaying the map data. The map data storage medium defines the shape of the road as the map data by defining a shape of the road by a set of a plurality of links specified by coordinate points . Multiple defining shape
Have a link ID with a serial number attached to the link
And link ID information for specifying a link in the shape point information for road maps in first and second different display forms, respectively . Less link ID information for display mode
One of them is constituted by the link IDs of the start and end, and the control means is configured by the link IDs of the start and end.
Road map of the display form by specifying the link ID column between
When a road map is displayed in the first display mode, a set of links in the shape point information is specified by link ID information for the first display mode, and the first set of links is specified.
The display means displays a road map in a display form of
When a road map is displayed in the display mode, a set of links in the shape point information is specified based on the link ID information for the second display mode, and the road map in the second display mode is displayed on the display means. A vehicle road map display device.