JPH09138130A - Map indicator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate user's recognition and judgment by selecting an enlarged drawing around a set point such as crossing point, interchange on high-way or toll road, etc., in a stored map data. SOLUTION: A map data of a unit corresponding to the present position obtained by a CPU 10 is read from a CD-ROM 7 through a CD-ROM drive 6, and it is stored in a memory (D-RAM) 12. Then, in order to indicate an enlarged drawing, a specified point such as crossing point, interchange of high- way or toll road in a map data is selected by means of a selection means of the CPU 10, and a coordinate of the selected specified point is obtained. Next, a map data around the obtained coordinate is read from the CD-ROM 7. On the basis of the read map data, a map around the selected points is enlarged and it is indicated on a liquid crystal display 8A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map display device for displaying the current position of an automobile or the like on a map.

[0002]

2. Description of the Related Art Conventionally, a map display device of this kind generally includes an operating means for inputting a destination from the outside, a vehicle position data extracting means for obtaining vehicle position data for detecting a vehicle position, and a map. Storage means storing data, detecting a vehicle position from the vehicle position data, and reading map data from the detected vehicle position to the destination from the storage means,
A calculating means for searching a route from the read map data to the destination and outputting image data of a map in which the vehicle position and the searched route are displayed, and a map input by the calculating means are displayed. It was composed of display means.

FIG. 6 is a flow chart showing the display operation of the above conventional example. In FIG. 6, in step a, the scale of the map to be displayed on the liquid crystal display which is the display means is selected. Next, in step b, the map display data of the selected reduced scale is read from the storage means (CD-ROM). Based on the map display data read from the storage means, a map is drawn on the display means in step c.

Next, in step d, the road network data stored in the road layer is read from the storage means. The position and direction of the own vehicle are determined from the road network data and the current position data obtained by the calculation means (step e), and the own vehicle mark is displayed on the map displayed on the display means in step f. Is.

A display example of the display means is shown in FIG. 7, and shows that the vehicle 19 is currently traveling on the road R.

[0006]

However, the scale of the map displayed on the conventional display means is limited, and even at a finely detailed scale, it is about 1 / 10,000. Therefore, complicated intersections and highways are required.・ In the case of toll road interchanges, etc., the user can immediately recognize and determine these shapes,
Sometimes it was difficult to select a road to drive.

The present invention eliminates the above-mentioned conventional drawbacks, and an enlarged view is made on the basis of map data in the vicinity of a predetermined point such as an intersection or a highway / toll road interchange so that the user can easily recognize and discriminate. The object is to provide a map display device capable of displaying.

[0008]

In order to achieve the above-mentioned object, the present invention enlarges the vicinity of a predetermined point such as an intersection, an interchange on a highway or a toll road existing in the map data stored in the storage means. The selection means for selecting the enlarged view is provided.

Therefore, according to the present invention, the enlarged view selected by the selecting means can be displayed on the display means, which allows the user to view intersections, highways, and highways.
It is possible to easily recognize and discriminate a predetermined point such as an interchange on a toll road.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A map display device according to the present invention has, as described in claim 1, a storage means for storing map data, and a map read out from the storage means for reading the map data. Display means for displaying a map based on the data, and selecting means for designating a predetermined point such as an intersection, an interchange on a highway or a toll road existing in the map data, and selecting an enlarged view enlarging the periphery of the predetermined point. And an enlarged view selected by the selection means is displayed on the display means.

Therefore, according to the present invention, by selecting a predetermined point such as an intersection, an interchange of a highway and a toll road by the selecting means, an enlarged view around the predetermined point selected by the display means is displayed. You can

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. FIG. 1 is a block diagram showing the configuration of the map display device according to the embodiment. FIG.
In the above, reference numeral 1 denotes an azimuth sensor, and this azimuth sensor 1 uses a geomagnetic sensor for detecting the absolute traveling azimuth of the automobile and an optical gyro for detecting the relative traveling azimuth of the automobile.
Reference numeral 2 is a distance sensor that generates a pulse according to the rotation speed of the wheel, and 3 is various sensor signals such as an ON / OFF signal of a brake switch and a parking switch and a power supply voltage monitoring signal.

Reference numeral 4 is a sensor signal processing unit for processing signals transmitted from the azimuth sensor 1 and distance sensor 2 or various sensor signals, and 5 is a GPS (Global Positioning System) receiver. The GPS receiver 5 transmits from a plurality of satellites. The position (latitude, longitude) of the receiving point is obtained by receiving and calculating the received radio wave.

Reference numeral 6 is a CD-ROM drive.
The D-ROM drive 6 is a CD that stores map data.
-To read map data from the ROM 7.

Reference numeral 8 denotes a display / operation unit installed in the vehicle compartment. The display / operation unit 8 displays a liquid crystal display 8 for displaying a map on which a mark of the vehicle, a searched route, and the like are described.
A and a touch panel 8B provided on the front surface of the liquid crystal display 8A. The touch panel 8B has a switch for instructing enlargement / reduction of the display map, a switch for instructing route search, and a liquid crystal display 8A. It is equipped with a switch that selects the destination from the place names.

Reference numeral 9 denotes an apparatus main body, which is installed in a trunk room or the like.

Next, the structure of the apparatus main body 9 will be described. 10 is a CPU (central processing unit) that performs various calculations,
Reference numeral 11 is a memory (program ROM) in which programs for various calculations performed by the CPU 10 are stored, and 12 is data from the azimuth sensor 1, distance sensor 2, GPS receiver 5, CD-ROM drive 6 and the like, calculation results by the CPU 10 and the like. Is a memory (D-RAM) for storing data, 13 is a backup memory (S-RAM) for holding necessary data even when power supply to the apparatus body 9 is stopped, and 14 is a liquid crystal display 8A. It is a memory (kanji / font ROM) in which patterns such as characters and symbols to be displayed are stored.

Reference numeral 15 is an image processor (graphic gate array) for forming a display image on the basis of map data, current position data of the vehicle, and 16 is map data output from the graphic gate array 15, current position data and A memory (V-RA) for storing the image displayed on the liquid crystal display 8A by combining the kanji and fonts such as the place names and roads output from the kanji and font ROM 14.
M) and 17 are RGB conversion circuits for converting the output data of the V-RAM 16 into color signals, and the converted color signals are output from the RGB conversion circuit 17 to the liquid crystal display 8A.

Reference numeral 18 is a communication interface. FIG. 2 shows a format of data stored in the CD-ROM 7, 20 is a disk label, 21 is drawing parameters, 22 is leaf management information, and 23 and 24 are leaf. Character data, road data, etc. are stored, and data for each unit map obtained by dividing a topographic map of Japan by latitude and longitude is stored. In the figure, a figure (level 0) that roughly describes a wide area and a figure (level 0) that describes a narrow area in detail are set. Each map leaf is a map display level A that describes the same area,
It is composed of B and C. Map display levels A, B, C
Describes B in more detail than A and C in more detail than B.

Each map display level A, B, C is composed of map display level management information and a plurality of units.
The unit describes a divided area obtained by dividing the area of each map display level into a plurality of areas, and each unit includes a unit header, a character layer, a background layer, a road layer, an option layer, and the like.

In the character layer, the place name displayed on the map,
Road names, facility names, etc. are recorded.
Data for drawing facilities and the like is stored, and in the road layer, as shown in FIG. 3, data on coordinate points (nodes) and lines (links) that describe roads including intersections, for example, nodes of nodes. The number, latitude, longitude, link number, link distance, etc. are stored.

That is, as shown in FIG. 3 showing the road data stored in the CD-ROM 7, white circles (∘) indicate nodes and lines between the nodes indicate links. Also,
A black circle mark (●) of the node number 4 indicates an intersection node. Note that the data recorded in the road layer is not directly involved in the map display, but is used as road network information such as map matching. Also, in the information layer, which is one of the option layers,
Detailed information about characters such as business hours of the facility displayed on the map, symbols existing in the background layer, and buildings and facilities is recorded.

The operation of the embodiment of the present invention having the above configuration will be described below. In FIG. 1, the output of the azimuth sensor 1 and the output of the distance sensor 2 are sent to the CPU 10 via the sensor processing unit 4. The CPU 10 calculates the current position of the vehicle and obtains the current position latitude and longitude. Further, the current position is corrected based on the data from the GPS receiver 5.

Based on the present position thus obtained, the map data of the unit corresponding to the present position is CD-R.
The map data is read from the CD-ROM 7 by the OM drive 6 and stored in the memory (DRAM) 12 via the communication interface 18. DRAM 12
A part of the map data stored in is read by the CPU 10, converted into image data by the image processor 15, and written in the image memory 16. The image data stored in the image memory 16 is converted into a color signal by the RGB conversion circuit 17 and sent to the liquid crystal display 8A, and a map of a predetermined range centering on the current position is displayed.

If the map data read from the DRAM 12 includes character codes and symbol codes, the patterns corresponding to these character codes and symbol codes are Chinese characters,
Since it is read from the font ROM 14, characters such as place names and symbols such as schools are displayed on the liquid crystal display 8A together with the map. In addition, the current position displayed on the liquid crystal display 8A is sequentially changed based on the traveling speed and the traveling azimuth which are sequentially obtained as the automobile travels.

FIG. 4 is a flow chart showing the enlarged view display processing according to the embodiment of the present invention. In FIG.
In step A, select a predetermined point such as an expanding intersection or a highway / toll road interchange.
Obtain the coordinates of the predetermined point selected in.

Next, in step C, the map data around the acquired coordinates is read from the CD-ROM 7.

On the basis of the map data read from the CD-ROM 7, the map around the selected predetermined point is enlarged in step D, and an enlarged view as shown in FIG. 5 is drawn on the liquid crystal display 8A.

[0029]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned structure, the user can display an enlarged view around a selected intersection or a predetermined point such as an interchange of expressways and toll roads on the display means. The complicated shape of the road can be easily recognized, and comfortable and safe driving can be performed.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram showing a format of a CD-ROM of the same embodiment.

FIG. 3 is a configuration diagram showing road data recorded in a CD-ROM of the same embodiment.

FIG. 4 is a flowchart of map display processing according to the same embodiment.

FIG. 5 is a display diagram showing a map display example according to the first embodiment.

FIG. 6 is a flow chart of conventional map display processing.

FIG. 7 is a display diagram showing a conventional map display example.

[Explanation of symbols]

 1 Direction Sensor 2 Distance Sensor 3 Output Signals from Other Sensors 4 Sensor Signal Processing Unit 5 GPS Receiver 6 CD-ROM Drive 7 CD-ROM 8 Display / Operation Unit 8A Liquid Crystal Display 8B Touch Panel 9 Device Main Body 10 CPU 11 Program ROM 12 D-RAM 13 S-RAM 14 Kanji font ROM 15 Graphic gate array 16 V-RAM 17 RGB conversion circuit 18 Communication interface 19 Current position

Claims (1)

[Claims] 1. Storage means for storing map data, display means for reading the map data from the storage means, and displaying a map based on the read map data, intersections existing in the map data, Selecting means for selecting predetermined points such as interchanges on expressways or toll roads and selecting enlarged views around these predetermined points, and displaying the enlarged view selected by the selecting means on the display means. A map display device characterized in that