JPH08278151A - Map display method of navigation system - Google Patents

Abstract

PURPOSE: To see a map easily in the case of plotting the map of an extensive level as well as to make a direction and a distance ranging from its own car position to the destination easily recognizable in the case of plotting the map of a detail level. CONSTITUTION: A scale-notation decision part 11c seeks a scale level where its own car position and the destination or a passing point can be displayed in one scope, and when this scale level is large than a setting level, a large area map LAMP is plotted by a stabilized display, while a own car mark CM is securely displayed at the specified position of a display scope, the map is scroll-displayed according to a movement of the own car. In addition, when the scale level is smaller than the setting level, a destination mark DM is securely displayed at the specified position upward a display screen SAMP, while the own car mark CM is shiftingly displayed toward the destination mark DM according to the own car position. In addition, likewise even in a heading-up display, the large area map LAMP of more than the setting level is displayed by the stabilized display, and a detail map SMAP of less than the setting level is displayed by a heading-up process.

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 for a navigation device, and more particularly, by a heading-up display method for displaying a map so that the traveling direction is at the top, or the vehicle position and the destination or passing point. Relates to a map display method of a navigation device that obtains a scale level that can be displayed within one screen and draws a map by a scalable display method that displays a map so that the destination is at the scale level.

[0002]

2. Description of the Related Art In a navigation device which guides a vehicle so that a driver can easily reach a desired destination, a vehicle position is detected and map data around the vehicle position is read from a CD-ROM. The map image is read out, a map image is drawn on the display screen, and a vehicle position mark (own vehicle mark) is drawn on a predetermined position on the map image.
Then, as the current position changes as the vehicle moves,
Move the vehicle mark on the screen, or fix the vehicle mark at a predetermined position such as the center of the screen and scroll the map,
The map information around the vehicle position is always visible at a glance.

Such a navigation device has a route guidance function for setting a guidance route from a starting point to a destination, displaying the guidance route on a map, and performing intersection guidance (enlarged intersection, display of traveling direction). There is. To set the guide route, the navigation device automatically determines the optimum route from the input departure point and destination, and the user (driver) marks the vehicle along the route from the departure point to the destination. There is a method to set by moving the simulation. The navigation route set by these methods is held in the navigation device by continuously storing the nodes (longitude, latitude) constituting the route in the memory. Then, at the time of actual traveling, a guide route included in the map display area of the screen is searched from the node row stored in the memory, and the guide route is displayed so as to be distinguishable from other roads,
It is designed so that you can know which road to drive and in which direction you should proceed at an intersection.

Further, the navigation device has a function of switching the map display method and displaying the map so that the driver can easily refer to the map. Display methods include heading-up display method, north-up display method, front-wide display method, and scalable display method. The heading-up display method is a method for displaying the map so that the traveling direction is directly above, and the north-up display method is a method for displaying so that the north on the map is directly above, and the front wide display method. Is
It is a method of drawing so that the traveling direction is directly above and displaying a wide area in the traveling direction. The scalable display method is to display the vehicle position and the next passing point (preset) or the vehicle position. This is a method of displaying a map at a scale level where a destination can be drawn on one screen and automatically changing the scale level according to the movement of the vehicle position to draw a map.

[0005]

In the scalable display method, the display is such that the direction of the passing point and the destination as viewed from the own vehicle position is upward. For this reason, in the scalable display, a wide area map is drawn when the vehicle position is far from the destination or the passing point, but depending on the positional relationship between the vehicle position and the destination or the passing point, north-south May be displayed in reverse video. There is no difficulty in seeing the north-south reversed on the detailed map. However, there is a problem that the map is difficult to see if the north-south is displayed in reverse on a wide-area map. For example, there is a problem that the map of Japan or the Kanto region is drawn upside down, the map is difficult to see, and it is difficult to recognize the position of the own vehicle. Such a problem is not limited to the scalable display, and is the same in the heading-up display in which the map is displayed so that the traveling direction is right above. For example, if a heading-up display is made on a wide area map, the north and south of the map are reversed and displayed, making the map difficult to see. As described above, when the map is displayed with the north and south reversed while the wide area map is being displayed, it becomes difficult to see, so the driver is switching the map display to the north-up display one by one. , There was a problem of poor operability.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a map display method for a navigation device, which can display a map easily when drawing a wide area map of a predetermined level or higher. Another object of the present invention is to display a wide area map of a predetermined level or higher in a north-up display even when a heading-up display or a scalable display is instructed.
Detailed maps below the level can be displayed by instructing heading-up or scalable
It is to provide a map display method capable of switching the display without driver's operation. Still another object of the present invention is to make it easy to see the map when drawing a map on a wide area level by combining with a scalable display method, and to recognize the direction and distance from a vehicle position to a destination when drawing a map on a detailed level. It is to provide a map display method that can be easily performed.

[0007]

According to the present invention, the above-mentioned problem is to provide a means for displaying a north-up display of a wide area map of a predetermined scale level or higher even when a heading-up display or a scalable display is instructed. The detailed map below the scale level is achieved by means of the indicated heading-up display or scalable display. Further, the above-mentioned problem is to fix a vehicle mark on a wide area map of a predetermined scale level or more at a predetermined position on a display screen to display north-up, and to scroll the map according to the movement of the vehicle, and a predetermined scale. In the detailed map below the level, the destination is fixedly displayed at a predetermined position in the upper center of the display screen, and the means for moving and displaying the own vehicle mark toward the destination according to the movement of the own vehicle is achieved. .

[0008]

The heading-up display method is used to display the map so that the direction of travel is at the top, or a scale level at which the vehicle position and the destination or passing point can be displayed in one screen is obtained, and the scale level is displayed at the scale level. In a map display method of a navigation device that draws a map by a scalable display method that displays a map so that the destination is at the top, in a wide-area map of a predetermined scale level or higher, the map is displayed in a north-up display and the scale level of Heading-up display or scalable display is provided on the detailed map. By doing so, the north-up display is automatically performed when a wide-area map of a predetermined level or higher is displayed, so that the map can be displayed easily and further, the operation performance can be improved because no map display switching operation is required. . ..Claim 1
Also, in a wide area map of a predetermined scale level or higher, the vehicle mark is fixed at a predetermined position on the display screen to display north up, and the map is scroll-displayed according to the movement of the vehicle. Uses the scalable display method to fix and display the destination at a predetermined position in the upper center of the display screen and move and display the own vehicle mark toward the destination according to the movement of the own vehicle. In this way, the map can be easily viewed when drawing a map on a wide area level, and the direction and distance from the vehicle position to the destination can be easily recognized when drawing a map on a detailed level.

[0009]

EXAMPLES (A) General Description of the Present Invention FIG. 1 is a schematic explanatory view of the present invention in a scalable display. In the figure, 11c is a scale / display method determination unit, which determines a scale level at which the vehicle position and a destination or a passing point can be displayed on one screen, and determines a map drawing method. LAMP is a wide area map drawn above the set level on the display device, SAMP is a detailed map drawn below the set level drawn on the display device, CM is a vehicle mark, and DM is a destination mark. It is assumed that the larger the scale level, the wider the area map will be drawn.

The scale / display method determination unit 11c obtains a scale level at which the vehicle position and the destination or passing point can be displayed on one screen, and when the scale level is larger than the set level, it is widened by north up. While drawing the map,
The vehicle mark is fixedly displayed at a predetermined position on the display screen (for example, the center of the screen), and the map is scrolled according to the movement of the vehicle. When the scale level is smaller than the set level, the destination is fixedly displayed at a predetermined position above the display screen, and the own vehicle mark is moved and displayed toward the destination according to the own vehicle position. The above is the case where the present invention is applied to the scalable display. Similarly, in the heading-up display, the wide area map above the set level is displayed in the north up, and the detailed map below the set level is displayed in the heading up. .

(B) Navigation system (a) Overall configuration FIG. 2 is an overall configuration diagram of the navigation system.
Reference numeral 1 is a navigation control device, 2 is an operation unit (for example, a remote controller) for inputting various commands to the navigation control device, guiding route setting operation, various data setting operation, and the like.
3 is a display device for displaying a map, a guide route, various menus, etc., 4 is a CD-ROM for storing map information, 5
Is a CD-ROM drive, 6 is a GPS receiver that receives radio waves from satellites to measure the current position and direction of the vehicle, 7 is a multi-beam antenna that receives radio waves from each satellite, 8
Is a self-contained navigation sensor. The GPS receiver 7 performs three-dimensional positioning or two-dimensional positioning processing to calculate the vehicle position and azimuth (the azimuth is the direction connecting the current vehicle position and the vehicle position one sampling time ΔT before), and positions these. Output with time. Although not shown, the self-contained navigation sensor 8 includes a relative azimuth sensor (angle sensor) such as a vibration gyro that detects a vehicle rotation angle, and a distance sensor that generates one pulse for each predetermined traveling distance.

The map information recorded in the CD-ROM 4 includes (1) a road layer, (2) a background layer for displaying an object on the map, and (3) a character layer for displaying characters such as city names. Character layer and (4) IIS (Integrated I
(nformation Service) information, and is configured by an IIS layer or the like. Of these, the road layer is road link data RLDT and node data ND as shown in FIG.
It has DT and intersection data CRDT. The road link data RLDT gives the attribute information of the road,
Consists of data such as the total number of nodes on the road link, the number of each node that makes up the road, the road number (road name), the type of road (national road, highway, prefectural road, and other types) There is. Further, the intersection data CRDT is a set of nodes (referred to as an intersection configuration node) closest to the intersection among nodes on a link connecting to the intersection for each intersection on the map. Is all the roads
It is a list of nodes, position information (longitude, latitude) for each node, an intersection identification flag for whether or not the node is an intersection, and if the node is an intersection, it points to the intersection data. If not, it is composed of a pointer or the like that points to the road link to which the node belongs.

(B) Remote control FIG. 4 is an external view of the remote control. 2a shows a cursor (also called a focus), a vehicle mark, etc., moved in eight directions relative to the map, and a desired menu item is displayed. It is a joystick key that is pressed when moving the menu selection bar up and down, left and right to select, setting and inputting the focus position, or when selecting a menu. In addition, hereinafter, when inputting a direction, it is called a joystick key, and when inputting a focus position or a menu item by pushing it down, it is called an ENTER key.
Reference numeral 2b is an enlargement key operated when displaying a detailed map, 2c is a reduction key operated when displaying a wide area map, and 2d is a menu key operated when displaying a menu. 2e is a navigation key (NV key) for displaying a map where the own vehicle position exists together with the own vehicle mark, 2f is a memory key (MEMO key) operated when storing a desired point, and 2g is a function key. Yes, a function that is frequently used can be set to select the function, and 2h is a power key.

(C) Display screen and menu FIG. 5 is an explanatory diagram of the display screen. The map is displayed on the display screen when the route is guided, but when the menu is called by the menu key 2d, the main menu M1, the sub menu M2, and the guide information M are displayed on the map.
3 is displayed. In this state, if the joystick key 2a is operated to position the menu selection bar at the position of the desired main menu item ("Information" item M12 in the figure), the submenu M2 belonging to the main menu item
Is displayed above it. Then, operate the joystick key 2a to select the desired submenu item (IIS in the figure).
When the submenu selection bar is located at the position (.) Is selected and the ENTER key is pressed, the submenu is opened and the function corresponding to the submenu can be executed.

FIG. 6 is an explanatory view of the menu, and six types of main menus are provided. The main menu M11 is a map display switching menu, and as a display method, heading up (displayed so that the traveling direction is directly above), north up (displayed so that north on the map is directly above), front Wide (heading-up display shows a wide traveling direction) and scalable display (displaying the position of the vehicle and the next passing point, or displaying the position of the vehicle and the destination at a reduced scale that can be drawn on one screen). The main menu "information" M12 is a menu for instructing selection display of predetermined IIS information, reception status display of satellite, selection of information symbol (INF) displayed on map, and start of demonstration of navigation device. The main menu "Directions" M13 is for setting destinations and passing points (setting of simple guidance route), turning on / off whether to guide the guidance route, turning on / off voice guidance at the intersection, and enlarged view at the intersection. This is a menu for setting display on / off, setting of detailed route (detailed guide route) by simulation, and display of remaining distance.

The main menu "Settings" M14 is GP
Selection of S error correction method (MM setting), change of own vehicle mark, CD-ROM disk drive switching instruction,
This is a menu for performing environment settings such as time signal on / off, initial screen on / off, guide information on / off, home position setting, home mark change, and traveling locus display on / off setting. The main menu “List” M15 is for turning on / off the travel locus, instructing to save / unlock (lock / unlock) the travel locus, delete (trajectory list), draw a peripheral map of the registered point (point This is a menu for selecting and displaying registered routes (simple and detailed guide routes) (route list) and setting functions for function keys (key macro). The main menu M16 is a menu for adjusting the display color and brightness of the map.

(C) Navigation Control Device FIG. 7 is a block diagram of the navigation control device, in which 1 is a navigation control device, 2 is a remote controller, 3 is a display device, 4 is a CD-ROM for storing map information, and 6 is G.
PS receiver, 7 is a multi-beam antenna, 8 is a self-contained navigation sensor, and a relative azimuth sensor (angle sensor) 8a such as a vibration gyro that detects a vehicle rotation angle, and one pulse is generated every predetermined traveling distance. The distance sensor 8b is provided. In the navigation control device 1, 11 is a map reading control unit, which calculates the screen center position (latitude and longitude) in various map displays, reads predetermined map information from the CD-ROM 4 based on the screen center position, and
The map display method is automatically switched according to the scale of the map drawn on the display device. The switching of the map display method will be described later. A map buffer 12 stores map information read from the CD-ROM. A plurality of pieces (a plurality of units) of map information around the vehicle position or the focus position, for example, 3 × 3 units of map information are read into the map buffer so that a map scroll described later can be performed. Reference numeral 13 is a map drawing unit, which generates a map image using the map information stored in the map buffer, 14 is a VRAM for storing the map image, 15
Is a read control unit that changes the position of one screen cut out from the VRAM 14 based on the screen center position (own vehicle position, focus position) and scrolls the map according to movement of the own vehicle position or focus movement.

Reference numeral 16 is an enlarged intersection drawing unit, which displays an enlarged view of the intersection at the upper right of the display screen when the vehicle mark reaches the intersection when setting a detailed route (detailed guide route) by simulation. At the same time, when the own vehicle approaches within a predetermined distance from the intersection at the time of actual route guidance, the enlarged view of the intersection and the traveling direction are similarly displayed on the display screen. Reference numeral 17 denotes a remote controller control section for receiving a signal according to the operation of the remote controller to instruct each section, and 18 denotes G
A GPS data storage unit that stores GPS data from the PS receiver, 19 is a vehicle position / azimuth calculation unit that calculates the own vehicle position and traveling direction based on the self-contained navigation sensor output, and 20 is a map matching control unit, and a map A map matching process is appropriately performed using the map information and the traveling locus data read out in the buffer 12 to correct the vehicle position.

In self-contained navigation, errors accumulate and the vehicle position deviates from the road as the vehicle travels. Therefore, the map matching control unit 20 corrects the vehicle position on the road by comparing the traveling locus with the road data of the map. If the vehicle position deviates significantly from the road due to a large error in the self-contained navigation and the vehicle position cannot be map-matched with the actual position on the road, the map matching control unit 20 causes the GPS
Position data (GPS position), direction data (G
Correct the vehicle position and running direction by self-contained navigation using PS direction). That is, the map matching control unit 20 calculates the distance D between the GPS position and the self-contained navigation position, and the distance D and a preset distance threshold Dth (for example, 15
0 m) is compared, and if D> Dth, the vehicle position is corrected by GPS data, and the vehicle position mark is placed on the road by map matching performed thereafter.

Reference numeral 21 is a guide route control unit, 22 is a guide route memory, and 23 is a guide route drawing unit. The guide route is 2 of the simple route (simple guide route) and the detailed route (detailed guide route).
There are various types, and the guide route control unit 21 can register a maximum of eight simple routes and one detailed route in the guide route memory 22. The simple route is composed of a passing point and a destination (the last passing point is the destination), and the set passing points and destinations (the last passing points) are sequentially guided as shown in FIG. It is stored in the route list storage area 22a of the route memory 22 in association with the course number. The passage point (destination) is registered by operating the joystick key 2a or the enlargement / reduction keys 2b and 2c to bring the focus to a desired point on the map and operating the ENTER key. For example, as shown in FIG. 9, the joystick key 2a is operated to display the focus on the display screen, and the joystick key 2a or the enlargement / reduction keys 2b and 2c are operated to sequentially change the focus to points Pp ₁ , Pp ₂ and Pd. If these points are registered according to, the points Pp ₁ and Pp ₂
(The above is the passing point) and Pd (destination) are stored as simple directions in the route list storage area 22a of the guide route memory 22 in association with the course numbers.

The detailed route is selected from one of the simple routes and set by simulation. The detailed route is a detailed route of all routes from the vehicle position to the destination, or a route in which detailed routes of some areas are omitted (jumped), and the position data of all nodes on the route and the intersection identification flag are set. Detailed route storage area 22b of the sequential guide route memory 22
Is stored. For example, as shown in FIG. 10, if a detailed route from the vehicle position Ps to the point P1 is set in the first area AR1 by simulation, the guide route control unit 21 stores the guide route memory 22 in the guide route memory 22 as shown in FIG. Further, the positions (longitude and latitude) of all the nodes on the route from the departure point (vehicle position) Ps to the point P1 and the intersection identification flag are continuously stored. Then, if a "jump" is input to omit setting of a detailed route in the second area AR2, the guide route control unit 21 outputs "jump (detail route setting omitted)" to the detailed route storage of the guide route memory 22. Write in the area 22b. Then, if a detailed route from the point P2 to the destination Pd is set by simulation in the third area AR3, the guide route control unit 21 causes the detailed route storage area 22b.
Further, the positions (longitude and latitude) of all the nodes on the route from the point P2 to the destination Pd and the intersection identification flags are continuously stored.

At the time of actual traveling, the guide route drawing unit 23 reads the specified route from the guide route memory 22 and draws it on the map, and guides the vehicle position and the next passing point or destination with a straight line. A passing point mark (flag) indicating the beam and passing point, and a destination mark are displayed. In the case of the simple route, only the guide beam, the passing point mark, and the destination mark are displayed. FIG. 12 is an explanatory view of the guide beam display, and shows a case where one passing point Pp and a destination Pd are set as a simple route. The dotted line frame is a display screen, PM is a passing point mark (flag), and DM is a destination mark. When the own vehicle position is closer to the departure point than the passing point Pp, the guide beam GBM connecting the own vehicle position Pc and the passing point Pp is displayed, and after passing the passing point Pp, the own vehicle position P
A guide beam GBM 'connecting between c'and the destination Pd is displayed.

Reference numeral 24 is an operation screen generation unit for displaying various menu screens (operation screens), 25 is a mark generation unit for displaying various marks such as a vehicle mark and focus, and 26 is an image composition unit. The mark generation unit 25 displays the focus at the center of the screen when the focus should be displayed.
In the situation where the vehicle mark should be displayed, the vehicle mark is displayed in the center of the screen when displaying north up or heading up, and when displaying front wide, it is fixed at a predetermined position below the center of the display screen. The display is moved toward the destination according to the movement of the own vehicle position.

(D) Configuration of Map Read Control Unit FIG. 13 is a configuration diagram of the map read control unit 11. Reference numeral 11a is a screen center position determining unit, 11b is a map reading unit, and 11c is a scale / display method determining unit. Screen center position determination unit 11a
Indicates the vehicle position in the center of the screen and draws a map. In the north-up display and heading-up display, the vehicle position is the latitude and longitude of the screen center, and the vehicle mark is a predetermined position N pixels below the screen center. In the case of the scalable display, the position of N pixels above the vehicle position is calculated as the latitude and longitude of the center of the screen in consideration of the scale, and the destination is displayed M pixels above the center of the screen. , Considering the scale, the position below the destination by M pixels is calculated as the latitude and longitude of the screen center, and the focus position is displayed on the screen when the map is moved or enlarged / reduced by the joystick key 2a and the enlargement / reduction keys 2b and 2c. Calculate as the center position. Further, the screen center determination unit 11a calculates and outputs the position of the own vehicle mark on the display screen in the scalable display.

The map reading unit 11b reads the map data around the vehicle position or the map data around the focus from the CD-ROM 4 based on the center position of the screen. When the scalable display is requested, the scale / display method determination unit 11c finds a scale level at which the vehicle position and the destination or the passing point can be displayed in one screen, and the scale level is set level (for example, the most detailed). If the map display level is higher than 0 level), the north up display is instructed,
When the scale level is the set level (= 0 level), the scalable display is instructed. The scalable display is a map display method in which the destination is fixedly displayed at a predetermined position above the center of the display screen and the vehicle mark is moved and displayed according to the vehicle position. That is, in the scalable display, the map is displayed so that the destination is located at a fixed position above the center of the display screen, and the vehicle position is on a straight line connecting the destination and the center of the screen. Without moving the map, the vehicle mark is moved and displayed toward the destination according to the movement of the vehicle.

The map in this scalable display is displayed after being rotated by an angle θ formed by the north line and the straight line (a straight line connecting the destination and the center of the screen). Therefore, the rotation angle θ is input to the map drawing unit 13, the map drawing unit 13 performs coordinate conversion processing on the map data for the angle θ, generates a map image and stores it in the VRAM 14, and the read control unit 15 A map for one screen is cut out from the VRAM based on the center position of the screen and drawn on the display device 3.

(E) Simple Route Registration Process FIG. 14 is an explanatory diagram of a simple route registration process of inputting a passing point and a destination and registering these as a simple route. The menu screen is displayed on the display device by operating the menu key 2d, "Direction" is selected from the main menu, and then "Direction setting" is selected from the submenu (step 10).
1). Then, a destination mark (a plurality of types of destination marks are prepared) for displaying the destination is selected (step 102). After that, joystick key 2
a, Enlarging / reducing keys 2b and 2c are operated to move the focus (actually, the passing point mark) relative to the map, and to match the predetermined passing point (point Pp _{1 in} FIG. 9) ENTE
Enter the passing point by pressing the R key (step 10)
3). Then, it is judged whether or not it is necessary to further input the passing point (step 104), and if it is necessary to input, the process returns to step 103, and thereafter, the passing point Pp ₂ and the final passing point P are set.
Enter d (the destination). Then, after inputting all the passing points, by performing a route registration operation, the passing points and destinations are registered in the route list 22a of the guide route memory 22 as simple routes in association with predetermined course numbers (step 105). After that, by repeating the above operation, a maximum of 8
You can register different types of simple directions.

(G) Scalable Display Processing FIG. 15 is a flow chart of scalable display processing, and FIG. 16 is an explanatory diagram of scalable display. A predetermined simple route is selected from the route list and the course number is input (step 201). The map read control unit 11 checks whether it is in the scalable display mode. That is, it is checked whether scalable display is requested (step 20).
2). If scalable display is not required,
The screen center position is calculated according to the required display method (north up, heading up display, etc.), and the map is read to the map buffer 12 according to the screen center position. The map drawing unit 13 generates a map image based on the map data and outputs V
The map is stored in the RAM 14, and the read control unit 15 cuts out a map for one screen based on the center position of the screen and draws it on the display device. Further, the mark generation unit 25 draws the own vehicle mark at the center of the screen. In parallel with the above, the guide route control unit 2
1 inputs the course number into the guide route drawing unit 23 and instructs the start of display of the guide route. As a result, the guide route drawing unit 23 draws a passing point mark (flag) at the passing point position and a destination mark at the destination, and displays a guide beam connecting the own vehicle position and the next passing point or destination. (Step 203).

Then, as the vehicle moves, the map reading control unit 11 updates the center position of the screen, reads the map data from the CD-ROM 4 into the map buffer 12, and the map drawing unit 13 stores the map image in the VRAM 14. Then, the read control unit 15 cuts out a map for one screen based on the center position of the screen and scrolls the map (step 204). After that, the processing from step 202 onward is repeated. On the other hand, when the scalable display is requested in step 202, the scale / display method determination unit 11c (FIG. 13) of the map read control unit 11 determines the vehicle position and the next passing point or destination (destination). Calculates the scale level that can be displayed on one screen (step 205), and checks whether the scale level is a set level (for example, 0 level which is the most detailed map display level) (step 206). . When the scale level is not 0 level but 1 level or more, it is instructed to display the map at the scale level and the north-up display. As a result, the screen center position determination unit 11
a, map reading unit 11b, map drawing unit 13, reading control unit 1
5 displays the map of the calculated scale level by the north-up display, the mark generation unit 25 draws the own vehicle mark CM at the center position of the screen, and the guide route drawing unit 23 displays the guide beam GBM (step 207, See FIG. 16 (a). After that, the map is scroll-displayed according to the movement of the vehicle position (step 208), and the process returns to step 205.

When the own vehicle position and the destination approach each other and the scale level becomes small in accordance with the movement of the own vehicle position, it is checked whether the scale level is 0 level (step 206), and 0 is checked.
If it is not a level, the processing from step 207 onward is repeated. When the vehicle position approaches the destination (see FIG. 16 (b)) and the scale level at which the vehicle position and the destination can be displayed on the same screen becomes 0 level, the scale / display method determination unit 11c displays the center of the screen. The position determination unit 11a is instructed to display the 0-level map in a scalable manner, and the rotation angle θ is input to the map drawing unit 13 in the map drawing unit 13. The rotation angle θ is
It is the angle defined by: That is, in the scalable display, the destination is initially at a predetermined position above the center of the display screen, and the map is displayed so that the vehicle position is on a straight line connecting the destination and the screen center, Thereafter, the map of the vehicle is moved and displayed toward the destination according to the movement of the vehicle without moving the map. The angle formed by this straight line (the straight line connecting the destination and the screen center) and the north direction is the map rotation angle θ.

The image center position determining unit 11a calculates the image center position in the scalable display, and the map reading unit 11
In b, predetermined map data is read from the CD-ROM 4 and stored in the map buffer 12 based on the scale level and the image center position. The map drawing unit 13 performs coordinate conversion processing for the rotation angle θ on the map data to generate a map image, and the VRAM 1
4, and the read control unit 15 cuts out a map for one screen based on the screen center position and draws the map on the display device. Further, the mark generation unit 25 draws the own vehicle mark on the display screen of the own vehicle mark CM input from the screen center position determination unit 11a, and the guide route drawing unit 23 sets the own vehicle position as the own vehicle position. A guide beam GBM connecting the destinations is drawn, and a destination mark DM is drawn (step 209, see FIG. 16C).

After that, each time the vehicle moves, the screen center position determination unit 11a calculates the drawing position of the vehicle mark CM on the display screen, and the mark generation unit 25 draws the vehicle mark at that position to guide the route. The drawing unit 23 draws the guide beam GBM that connects the vehicle position and the destination (step 21).
0). When the own vehicle mark CM moves toward the destination according to the movement of the own vehicle and reaches the destination (step 211),
The scalable display process ends.

In the above, the set level is set to 0 level and 0
I explained about the original scalable display at the level, and the north-up display at the level 1 and above.
The set level can be one level, two levels or any other level. In the scalable display, the north-up display is performed when the scale level is equal to or higher than the set level, and the original scalable display is performed when the scale level is lower than the set level.However, even in the heading-up display, the scale level is equal to or higher than the set level. It is also possible to configure so that the north-up display is sometimes performed and the heading-up display is performed when the level is smaller than the set level. Although the present invention has been described above with reference to the embodiments, the present invention can be variously modified according to the gist of the present invention described in the claims, and the present invention does not exclude these.

[0034]

As described above, according to the present invention, when it is required to draw a map by the heading-up display method or the scalable display method, the map is north-uped in a wide area map of a predetermined scale level or higher. Since the heading-up display or the scalable display required in the detailed map below the scale level is displayed, the map is automatically displayed in the north-up display when drawing a wide area map of a predetermined level or higher. It can be displayed quickly, and since no map display switching operation is required, the operation performance can be improved.

Further, according to the present invention, in displaying a wide area map of a predetermined scale level or higher, the own vehicle mark is fixed at a predetermined position on the display screen and displayed in the north-up display, and the map is scrolled according to the movement of the own vehicle. In the detailed map below the predetermined scale level, the destination is fixedly displayed at a predetermined position in the upper center of the display screen, and the vehicle mark is moved (scalable display) according to the vehicle position. Therefore, it is possible to make the map easy to see when drawing a map on a wide area level, and to easily recognize the direction and distance from the vehicle position to the destination when drawing a map on a detailed level.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of the present invention.

FIG. 2 is a configuration diagram of a navigation system.

FIG. 3 is an explanatory diagram showing a structure of road data in map data.

FIG. 4 is an external view of a remote controller.

FIG. 5 is an explanatory diagram of a display screen.

FIG. 6 is a menu explanatory diagram.

FIG. 7 is a configuration diagram of a navigation control device.

FIG. 8 is an explanatory diagram of a route list.

FIG. 9 is an explanatory diagram of destinations and passing points.

FIG. 10 is an explanatory diagram of a detailed route including an abbreviated route.

FIG. 11 is an explanatory diagram of data stored in a guide route memory.

FIG. 12 is an explanatory diagram of a guide beam display.

FIG. 13 is a configuration diagram of a map reading control unit.

FIG. 14 is a flowchart of a simple route registration process.

FIG. 15 is a flowchart of a scalable display process.

FIG. 16 is a diagram for explaining scalable display.

[Explanation of symbols]

11c ··· Scale / display method determination unit LAMP · · Wide area map above the set level drawn on the display device SAMP · · Detailed map below the set level drawn on the display device CM · · Own vehicle mark DM · · Destination mark

Claims (2)

[Claims] 1. A scale level at which a vehicle position and a destination or a passing point can be displayed on one screen by a heading-up display method in which a map is displayed so that the traveling direction is upward, and the scale is calculated. In a map display method of a navigation device that draws a map by a scalable display method that displays a map so that the destination is at the top, in a wide area map of a predetermined scale level or higher, the map is displayed in a north-up display, and the scale level is The following detailed map is a heading-up display or a scalable display, which is a map display method for a navigation device. 2. In the scalable display, in a wide area map of a predetermined scale level or higher, the vehicle mark is fixedly displayed at a predetermined position on the display screen, the map is scrolled according to the movement of the vehicle, and the scale is below the predetermined scale level. The detailed map of claim 1, wherein the destination is fixedly displayed at a predetermined position in the upper center of the display screen, and the own vehicle mark is moved according to the movement of the own vehicle. Scalable display method.