JP3391138B2 - Route guidance 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 route guide device for displaying a route to a destination on a bird's-eye view road map to guide an occupant.

[0002]

2. Description of the Related Art A vehicle route guidance device is known in which a so-called bird's-eye view type road map is displayed on the display so that the road in the traveling direction is looked down from above the rear of the vehicle. For example, JP-A 1-2
63688 gazette). In this type of vehicle route guidance device, for example, information corresponding to a narrow range on a road map such as an ordinary road or a narrow street (called detailed information in this specification) is changed to a road map such as a highway or a national road. The lower part of the display screen has road map data of a lower layer including information up to information corresponding to a wide range (referred to as wide area information in this specification) and road map data of an upper layer including only wide area information, That is, the road map is drawn by using the road map data of the lower layer in the portion near the viewpoint, and the road map is drawn by using the road map data of the upper layer in the upper portion of the display screen, that is, the portion far from the viewpoint.

By the way, in the lower level road map data including detailed information to wide area information, the coordinates in the road map coordinate system are finely divided in order to accurately represent the position of the detailed information. On the other hand, in the upper level road map data including only wide area information, it is not necessary to represent the position of the wide area information so accurately, and the coordinates in the road map coordinate system are broadly divided in order to reduce the amount of data. Since the wide area information is included in both the road map data of the lower layer and the road map data of the upper layer, the wide area information is drawn at the bottom of the display screen using the road map data of the lower layer and the road map data of the upper layer is displayed. When the wide area information is drawn on the upper part of the display screen by using the difference between the coordinate divisions of both road map data, the difference between the two wide area information occurs at the boundary part between the lower part and the upper part of the display screen. It may not be a single road. Therefore, in the conventional route guidance device for a vehicle, the matching process of the wide area information that extends over both the boundary portions of the display screen drawn with different road map data is performed, and for example, the above-described deviation of the boundary portion of the highway is corrected. There is.

As described above, in the conventional vehicle route guidance device, since the matching process has to be performed at the boundary portion of the display screen drawn with different road map data, it takes a lot of processing time and drawing time. There is.
In addition, since information having a higher degree of wide area is redundantly stored in the road map data of lower to upper layers, the total amount of data becomes large and a large-capacity storage device is required, which increases the cost of the device. Furthermore, for the time being, if you display a road map consisting only of wide area information, you can draw the road map for the entire display screen and start guiding passengers, but if you do not draw all the road map data for all layers, the road map for the entire display screen will be displayed. Since it is not possible to draw, it takes a long time to draw, and there is also a problem that the occupant must wait for departure during that time.

It is an object of the present invention to provide a route guidance device for a vehicle in which a bird's eye view type road map drawing time is shortened.

[0006]

To achieve the above object of the Invention The invention of Claim 1, the information corresponding to a wide range of information corresponding to a narrow range of drawing road alley (detailed information) (Wide Area
Information) is stored in a plurality of hierarchies, and storage means for storing road maps of a plurality of hierarchies from the road map composed of the detailed information to the road map composed of the wide area information, and each of the memory means stored in the memory means. Conversion means for converting each of the hierarchical road maps into a bird's-eye view road map, and drawing means for drawing the plurality of hierarchical bird's-eye view road maps converted by the converting means on the display means. A route guidance device for a vehicle , comprising:
From the detailed information to the range from near to far
A road map consisting of the wide area information before the Naru road map
Convert to a bird's-eye view road map and draw . The vehicle route guidance device according to claim 2 is a distance for detecting a traveling distance of the vehicle.
Detection means, and azimuth detection means for detecting the traveling azimuth of the vehicle
And a road map comprising the wide area information on the display means.
After the drawing
The traveling of the vehicle above is detected, or the direction detection hand
When a step detects that the vehicle has rotated more than a predetermined angle,
A road map consisting of detailed information is converted to a bird's-eye view road map.
Before converting and drawing the road map consisting of the wide area information
To update . The vehicle route guidance device according to claim 3, wherein the display
After the road map consisting of the wide area information is drawn on the means
The movement of the vehicle over the predetermined distance and the predetermined angle
When the above vehicle rotation is not detected, the display means
In front of the road map consisting of the wide area information displayed in
The detailed information is displayed on the display screen of the display means near the viewpoint.
Converting a road map consisting of information into a bird's eye view road map
Draw .

[0007]

In the vehicle route guiding apparatus according to claim 1, a display screen is provided.
Detailed information in the range from near to far
A road map consisting of wide area information before a road map consisting of
Convert to a bird's-eye view road map and draw . In the vehicle route guidance device according to claim 2, a road map including wide area information is displayed.
After being drawn, it is detected that the vehicle has traveled a certain distance or more.
Or rotation of the vehicle is detected over a specified angle
And a road map consisting of detailed information
The road map consisting of wide area information is updated before it is converted to and drawn.
To be new . In the vehicle route guidance device according to claim 3, wide area information
After a road map consisting of
Both movements and rotation of the vehicle beyond a specified angle are not detected.
If not, on a road map consisting of wide area information displayed
Roads that consist of detailed information near the viewpoint of the display screen of
Convert the map into a bird's-eye view road map and draw it .

[0008]

FIG. 1 is a functional block diagram showing the structure of an embodiment. The vehicle route guidance device of this embodiment is mainly composed of a microcomputer. The azimuth sensor 1 detects the traveling direction of the vehicle, and the detected traveling direction information is A / D.
CPU 4 via converter 2 and interface circuit 3
Send to. The vehicle speed sensor 5 generates a pulse signal for each predetermined traveling distance of the vehicle, and C
Output to PU4. The CPU 4 counts the number of pulses of this pulse signal to detect the traveling distance of the vehicle. GPS
The receiver 6 is a receiver of a position detection system using a satellite, and sends information such as the current position of the vehicle and the traveling direction to the CPU 4 via the interface circuit 3. The key 7 is an operation member for setting a destination of the vehicle and the like, and is connected to the CPU 4 via the interface circuit 3.

The CD-ROM 8 is a storage device for storing road map data and character data, is connected to the CPU 4 via the interface SCSI controller 9, and responds to a road map read command from the CPU 4 to specify a road map in a specified range. Data and character data are sent to the CPU 4. The display 10 for displaying the road map is connected to the CPU 4 via the graphic controller 11,
Character information, the optimal route to the destination, and the vehicle's current location mark are displayed superimposed on a bird's-eye view road map. VR
The AM 12 stores bird's-eye view road map data and character data, and outputs the data to the display 10 via the graphic controller 11 in accordance with a display command from the CPU 4. Further, the CPU 4 includes a RAM 13 for temporarily storing various data and a ROM for storing a control program described later.
14 and the like are connected. The CPU 4 executes a processing program to be described later to convert the two-dimensional plane road map data into bird's-eye view road map data, draws the bird's-eye view road map on the display 10, and displays text information on the map. The current position of the vehicle and the optimum route to the destination are superimposed and drawn.

The conversion process from a two-dimensional plane road map to a bird's-eye view road map will be described below. FIG. 2 shows the relationship between a two-dimensional plane road map and a bird's-eye view road map. A two-dimensional plane road map is expressed on the XY plane with the east in the + X axis direction and the north in the + Y axis direction, and the sky above the road on this XY plane is taken in the positive direction of the Z axis orthogonal to the XY plane. Consider the three-dimensional coordinate system of. A viewpoint E (VX, VY, VZ) is set above the point that is a predetermined distance away from the current position of the vehicle to the destination, and the road map on the XY plane is looked down from this viewpoint E along the line of sight EF. To do. The angle formed by the line-of-sight EF and the XY plane is referred to as the looking-down angle θ, and a straight line E′F obtained by projecting the line-of-sight EF on the XY-plane,
The angle formed by the + X axis is called the line-of-sight direction φ. When the display frame abcd of the display 10 is set on a plane perpendicular to the line of sight EF and the road map on the XY plane is looked down from the viewpoint E (VX, VY, VZ) through the display frame abcd, a trapezoidal A
You can see the road map in the range of BCD. This range ABCD is the display area of the road map.

The line of sight EF is the display frame ab of the display 10.
If it is set to pass through the center of cd and look down at the vehicle, the current location of the vehicle is displayed at the center of the display frame abcd. In this case, the lower display frame abgh of the display 10 corresponds to the display area ABGH, and the road map of the narrow area ABGH is displayed in the lower display frame abgh. The upper display frame ghdc corresponds to the display area GHDC, and the road map of the wide area GHDC is displayed in the upper display frame ghdc. That is, the road map in the range close to the viewpoint E is enlarged and displayed, and the road map is reduced and displayed as the distance from the viewpoint E increases. The current location of the vehicle is F (CX, CY). Current location of this vehicle F
(CX, CY) is located at the center of the side GH.

Next, each vertex of the display area ABCD is calculated. FIG. 3 shows an XY plane at Z = 0 in the three-dimensional coordinate system shown in FIG. A projection point E ′ (VX, VY) of the viewpoint E (VX, VY, VZ) on the XY plane is calculated by the following equation.

[Equation 1] Even when the current position of the vehicle is displayed at a position other than the center of the display frame abcd, the viewpoint height VZ and the line-of-sight direction φ are constant, so that the relative relationship between the viewpoint E and the display area ABCD is uniquely determined. The projection point E'can be calculated with a slight modification to 1. For example, the current position of the vehicle is displayed in the display frame a.
In the case of displaying below the vertical center on the horizontal center line of bcd, θ may be selected so that the term of (Vz / tan θ) in Expression 1 becomes smaller.

Here, the XY coordinate system shown in FIG. 3 is translated so that the viewpoint projection point E '(VX, VY) becomes the origin,
The X'Y 'coordinate system is set as shown in FIG. further,
The X′Y ′ coordinate system is set by rotating the X′Y ′ coordinate system so that the line of sight is on the Y axis. As shown in FIG. 5, the width of the display frame abcd of the display 10 is set to 1
Let S be the vertical width, and DS be the distance from the viewpoint E (VX, VY, VZ) to the display frame abcd, and the half-spread angle α is the angle between the line of sight EF and the straight line Eg. X shown in FIG.
The display area ABCD of the Y coordinate system corresponds to the display area A "B" C "D" of the X "Y" coordinate system shown in FIG. The coordinates of each vertex of the display area A "B" C "D" in this new X "Y" coordinate system are given by the following equations.

[Equation 2]

Next, the coordinates of each apex of the display area A'B'C'D 'in the X'Y' coordinate system considering the line-of-sight direction φ are obtained. Since the X'Y 'coordinate system is a rotation of the X "Y" coordinate system, the display area A "calculated by Equation 2
The coordinates of each vertex of B "C" D "are converted by rotating the coordinate axes.

[Equation 3] Further, each vertex of the display area in the XY coordinate system is calculated based on the calculated vertex coordinates of the display area A'B'C'D 'in the X'Y' coordinate system. Since the XY coordinate system is a translation of the X'Y 'coordinate system, Equation 3
The vertex coordinates of the display area A′B′C′D ′ calculated by the above are translated by VX in the X-axis direction and VY in the Y-axis direction for coordinate conversion.

[Equation 4]

Next, the coordinate conversion from the plane road map data in the XY coordinate system to the bird's eye view type road map data displayed on the display 10 will be described. FIG. 6 shows an EXEYEZ coordinate system with the viewpoint E (VX, VY, VZ) as the origin and the line of sight EF as the −Z axis, an SXSY display coordinate system with the center of the display frame abcd of the display 10 as the origin, and a display area. The relationship with ABCD is shown. Here, if the coordinates of the arbitrary road map data P in the XY coordinate system are (MX, MY), as shown in FIG. 4, the point E '(VX, VY) is moved in parallel so that it becomes the origin (X (Y 'coordinate system), and the coordinates (MX ", M of the arbitrary data P in the X" Y "coordinate system rotated so that the line of sight (E'F) overlaps the Y axis.
Y ”) is

[Equation 5] Required by. Next, the coordinates (MX ", MY") of the data P in this X "Y" coordinate system are calculated by the following formula: EXEYEZ
Convert to the coordinates of the coordinate system (EX1, EY1, EZ1).

[Equation 6] It should be noted that when Equation 5 is substituted into Equation 6 and transformed, it is expressed as follows.

[Equation 7] Furthermore, the coordinates of the data P in the EXEYEZ coordinate system (EX
1, EY1, EZ1) is converted into coordinates (SX1, SY1) of the SXSY coordinate system by the following equation.

[Equation 8] SX1 = -DS * EX1 / EZ1, SY1 = -DS ・ EY1 / EZ1

Here, a method of classifying the road map data stored in the CD-ROM 8 will be described. In this embodiment, the road map data is classified into three hierarchies of detailed, intermediate and wide area and separately stored in the CD-ROM 8. Figure 7
Indicates road map data classified into three types. From the two-dimensional plane road map shown in (a), only wide area information corresponding to a wide range on the road map such as expressways and national roads indicated by bold lines is extracted, and as shown in (b) wide area road map data. Is stored in the CD-ROM 8. Further, from the two-dimensional road map shown in (a), only the intermediate information corresponding to the intermediate range on the road map such as the general road shown by the solid line is extracted, and as shown in (c), the intermediate road map is extracted. CD as data
-Store in ROM8. Further, from the two-dimensional road map shown in (a), only detailed information corresponding to a narrow range on the road map such as a narrow street indicated by a broken line is extracted, and (d)
CD-ROM8 as detailed road map data as shown in
Remember. Polygonal information such as railways other than roads, lakes, parks, etc., and character information such as administrative boundaries are also classified into detailed information, intermediate information, and wide area information, and are separately stored in the road map data of each layer described above.

Each of the three types of road map data is managed by dividing the whole country into small sections (hereinafter referred to as regional meshes) defined in JIS-X0410.
The road map data is read from the OM8 in units of regional meshes. The road map data is dataized by nodes that indicate intersections, flex points, etc. on roads, and links that connect the nodes to each other, and are stored together with hierarchical level information based on the position coordinates of each node and each link and the road type. Has been done. In addition to road information, this road map data also includes polygon information such as railroads, lakes, and parks.

In this embodiment, the display frame abcd of the display 10 is divided into three regions, a lower part, a middle part and an upper part, as shown in FIG. 8 (a). In the lower part, detailed information of detailed road map data, intermediate information of intermediate road map data, and wide area information of wide area road map data are displayed. In the middle part, the intermediate information of the intermediate road map data and the wide area information of the wide area road map data are drawn. Only the wide area information of the wide area road map data is drawn on the upper part. Conversely, the display area of detailed road map data is only the lower part, the display area of intermediate road map data is the lower part and the middle part, and the display area of wide area road map data is the entire display area from the lower part to the upper part. is there. The display area ABCD of the two-dimensional road map is also displayed in the display frame abc.
corresponding to each divided region of d, three regions',
Split into ','.

9 and 10 are flowcharts showing a road map display program according to one embodiment, and FIGS. 11 to 13 are diagrams for explaining detailed, intermediate and wide area map drawing processing. The operation of the embodiment will be described with reference to these drawings. When the main switch of the key 7 is turned on, the CPU 4 starts executing this control program. In step 100, the destination information set by the key 7 is read,
In the following step 102, the current position and traveling direction of the vehicle are detected. The current location of the vehicle may be calculated by self-contained navigation,
It may be detected by GPS navigation. Also, both may be used in combination. The former calculates the traveling locus based on the traveling azimuth detected by the azimuth sensor 1 and the traveling distance measured by counting the pulse signals from the vehicle speed sensor 5, and specifies the current location by map matching. The latter uses the current position and the heading calculated by the GPS receiver 6. In step 104, the optimum route from the current position to the destination is calculated by a known route search method.

In step 106, the direction φ of the line of sight EF
To calculate. For this line-of-sight direction φ, for example, the direction in which the distance of the optimum route displayed on the display 10 is maximum may be set, or the traveling direction of the vehicle may be simply set. Alternatively, the direction of the destination may simply be set. In the following step 108, the current position F (CX, C of the vehicle is
The position of the viewpoint E and the line of sight EF are determined so that Y) is displayed in the center of the display frame abcd of the display 10. It should be noted that in this embodiment, the Z coordinate VZ of the viewpoint E and the looking-down angle θ
Is a predetermined value set in advance.

In step 110, the vertices of the display area of the wide area road map, that is, the display area including the lower part ', the middle part' and the upper part 'shown in FIG. 8B are calculated.
The display area of the wide area road map is the display area ABCD corresponding to the display frame abcd of the display 10. In step 112, based on the calculated vertices of the display area,
From the wide area road map data stored in the CD-ROM 8, the road map data in the range including the display area "..." Is read into the RAM 13. In the following step 114, as shown in FIG. 11, the wide-area road map data (a) on the XY plane read from the CD-ROM 8 is coordinated to the bird's-eye view road map data (b) displayed on the display 10 in the above-described procedure. Convert. In step 116, the bird's eye view wide area road map data is transferred to the V-RAM 12 and is drawn in the display area of the display 10 through the graphic controller 11 and the car mark indicating the current position of the vehicle and the purpose calculated in the above step. The optimal route to the ground is overlaid and displayed on the bird's eye view wide area road map that is being displayed.

In step 118, it is determined whether the vehicle has moved a predetermined distance or has rotated a predetermined angle, and if there is movement or rotation of the vehicle, step 106 is performed.
Then, the process of drawing the wide area road map is repeated to update the bird's eye view wide area road map. If there is no movement or rotation of the vehicle when the wide area road map is drawn, step 1
Proceeding to 20, the intermediate road map is superimposed and drawn on the wide area road map. In step 120, the vertices of the display area of the intermediate road map, that is, the display area including the lower part 'and the intermediate part' shown in FIG. 8B are calculated. In step 122, the road map data of the range including the display areas'and 'is read into the RAM 13 from the intermediate road map data stored in the CD-ROM 8 based on the calculated vertex of the display area. In the subsequent step 124, as shown in FIG. 12, the coordinates of the XY plane intermediate road map data (a) read from the CD-ROM 8 is converted into the bird's-eye view road map data (b) displayed on the display 10 in the above-described procedure. Convert. In step 126, the bird's-eye view type intermediate road map data is transferred to the V-RAM 12 and drawn in the display area of the display 10 via the graphic controller 11. At this time, since the wide area road map has already been drawn in the display area of the display 10 to, the intermediate road map is displayed in a superimposed manner on the display area of the display frame abcd as shown in FIG.

In step 128, it is determined whether the vehicle has moved a predetermined distance or has rotated a predetermined angle, and if there is movement or rotation of the vehicle, step 106 is performed.
Then, the process of drawing the wide area road map is repeated to update the bird's eye view wide area road map. If there is no movement or rotation of the vehicle when the intermediate road map is drawn, step 1
In step 30, the detailed road map is superimposed and drawn on the wide area and intermediate road maps. In step 130, the vertices of the display area of the detailed road map, that is, the upper'display area shown in FIG. 8B are calculated. In step 132, the road map data of the range including the display area 'is read from the detailed road map data stored in the CD-ROM 8 into the RAM 13 based on the calculated vertex of the display area. In the following step 134, as shown in FIG.
-The detailed road map data (a) of the XY plane read from the ROM 8 is coordinate-converted into the bird's-eye view road map data (b) to be displayed on the display 10 by the procedure described above.
In step 136, the detailed road map data of the bird's-eye view method is transferred to the V-RAM 12 and drawn in the display area of the display 10 via the graphic controller 11. At this time, the display area of the display 10 is already ~
Since the wide-area road map and the intermediate road map are drawn in, the detailed road map is superimposed and displayed in the display area of the display frame abcd as shown in FIG. 13C. Step 1
At 38, it is determined whether the vehicle has moved a predetermined distance or whether the vehicle has rotated a predetermined angle. If there is movement or rotation of the vehicle, the process returns to step 106 to repeat the processing of drawing the wide area road map, and the bird's-eye view method. The wide area road map of is updated.

As described above, the road map data includes wide area road map data including wide area information corresponding to a wide range on the road map and intermediate road map data including intermediate information corresponding to an intermediate range on the road map. , With wide area road map data consisting of detailed information corresponding to a narrow area on the road map 3
The data is classified into one layer and stored in the CD-ROM 8, the road map data of each layer is converted into a bird's-eye view road map, and the converted bird's-eye view road maps are superimposed on the display 10. Since it is drawn in this way, it is not necessary to perform the matching processing of the boundary part on the display screen drawn with the road maps of different layers, the drawing time of the road map is shortened, and one information is stored in multiple layers. Since it is not redundantly stored in the road map data, the data amount of the entire road map is reduced, a large-capacity storage device is unnecessary, and the cost of the device can be reduced. In addition, a road map consisting of wide area information is drawn from a region near the viewpoint of the display screen to a region far from it, and a road map consisting of detailed information is drawn in a region near the viewpoint of the display screen. That is, detailed information to wide area information can be obtained around the current location of the vehicle, and only wide area information can be obtained in a portion far from the viewpoint, that is, around the destination of the vehicle, and optimum information is provided in the positional relationship with the vehicle. The road map consisting of wide area information in the road maps of multiple layers is converted into a bird's-eye view road map in order, the road map consisting of wide area information is drawn first, and the road map consisting of detailed information is drawn on the road map. Since the images are superimposed and drawn, the road map can be drawn only on the wide area information for the entire display screen for the time being, and the occupant in a hurry can start immediately while looking at the wide area road map. After the road map including the wide area information is drawn on the display 10, when the traveling of the vehicle over the predetermined distance or the rotation of the vehicle over the predetermined angle is detected, the road map including the wide area information is updated. As a result, even if the vehicle moves or rotates at high speed, it is possible to draw a road map in real time.For example, even if the vehicle turns right or left at an intersection or makes a U-turn, the road map after turning can be drawn quickly. it can.
Furthermore, a road map consisting of wide area information is displayed 10
When the movement of the vehicle over a predetermined distance and the rotation of the vehicle over a predetermined angle are not detected after drawing in, the road map consisting of intermediate information in the road maps of multiple layers is converted into a bird's-eye view road map, Since the converted road map is drawn by superimposing it on the road map composed of wide area information displayed on the display 10, a detailed road map is displayed when the vehicle is not moving or rotating or the speed is low. It is possible to draw up to, and it is possible to provide accurate information corresponding to changes in the running state of the vehicle.

In the above-described embodiment, the road map data is classified into three layers of detailed, intermediate and wide areas and stored separately, but the classification method and type of road map data are the same as those described above. It is not limited to the example. Further, in the above-described embodiment, an example in which the road map data of all three layers is stored in the CD-ROM 8 is shown, but the road map data of each layer may be stored in separate storage devices.

In the configuration of the above embodiment, the display 10 serves as the display means, the CD-ROM 8 serves as the storage means, and C
PU4 the conversion means and the drawing hand stage, the vehicle speed sensor 5 is a distance detecting means, direction sensor 1 constitutes the azimuth detection means, respectively.

[0027]

As described above, according to the first aspect of the invention, the range from the portion close to the viewpoint of the display screen to the portion far from the viewpoint is displayed.
Surround the wide area information before the road map that contains detailed information.
Convert the road map into a bird's-eye view road map and draw it
Since it was done, wide area information for the whole display screen for the time being
You can draw a road map with just this
You can start immediately while looking at the wide area road map .
According to the invention of claim 2, the road map including wide area information
After being drawn, it is detected that the vehicle has traveled a certain distance or more.
Or rotation of the vehicle is detected over a specified angle
And a road map consisting of detailed information
The road map consisting of wide area information is updated before it is converted to and drawn.
So that the vehicle will move or rotate at a high speed.
Even if you can draw a road map in real time,
For example, even if you turn right or left at the intersection or make a U-turn, after turning
Can quickly draw the road map of . Claim 3
According to the invention, a road map consisting of wide area information is drawn.
After a certain distance, the vehicle moves more than a certain distance and more than a certain angle
When the rotation of the vehicle is not detected, the
Area near the viewpoint of the display screen on the road map consisting of area information
In addition, a road map consisting of detailed information
Since it was converted to and drawn, the movement of the vehicle or
Detailed road when there is no rotation or low speed
It is possible to draw even a road map and change the running state of the vehicle.
It is possible to provide accurate information corresponding to .

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment.

FIG. 2 is a diagram showing a relationship between a two-dimensional plane road map and a bird's-eye view road map.

FIG. 3 is a diagram showing a display area of a road map on an XY two-dimensional plane.

FIG. 4 is an X′Y ′ coordinate system obtained by translating the XY two-dimensional plane map coordinate system shown in FIG. 3 so that the viewpoint is the origin, and X ″ Y rotated so that the line-of-sight direction overlaps the Y axis. "A diagram showing a coordinate system.

FIG. 5 is a diagram showing a relationship between a viewpoint E and a display frame abcd of a display.

[FIG. 6] EX with the viewpoint E as the origin and the line of sight EF as the −Z axis
The figure which shows the relationship between an EYEZ coordinate system, the SXSY display coordinate system which makes an origin the center of the display frame of a display, and a display area ABCD.

FIG. 7 is a diagram illustrating classification of road map data.

FIG. 8 is a diagram showing division of a display frame of a display.

FIG. 9 is a flowchart showing a road map display program according to an embodiment.

FIG. 10 is a flowchart showing a road map display program of one embodiment following FIG. 9;

FIG. 11 is a diagram illustrating a drawing process of a wide area road map.

FIG. 12 is a diagram illustrating a process of drawing an intermediate road map.

FIG. 13 is a diagram illustrating a detailed road map drawing process.

[Explanation of symbols]

1 Direction sensor 2 A / D converter 3 Interface circuit 4 CPU 5 vehicle speed sensor 6 GPS receiver 7 keys 8 CD-ROM 9 SCSI controller 10 display 11 Graphic controller 12 V-RAM 13 RAM 14 ROM 15 receiver 16 Extended I / O

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-5-101163 (JP, A) JP-A-7-27568 (JP, A) JP-A-5-281904 (JP, A) JP-A-6- 273184 (JP, A) JP 2-219084 (JP, A) JP 6-214504 (JP, A) JP 5-35183 (JP, A) JP 2-4285 (JP, A) JP-A-8-137389 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G09B 29/00-29/14

Claims (3)

(57) [Claims] 1. A information corresponding to the narrow range of drawing road alley
Information corresponding to a wide range (hereinafter referred to as detailed information)
(Hereinafter referred to as wide area information) is classified into multiple layers,
Storage means for storing road maps of a plurality of layers from the road map composed of the detailed information to the road map composed of the wide area information, and the road maps of the respective layers stored in the storage means are bird's-eye view road maps. and converting means for converting, the road map of bird's-eye view mode of the transformed plurality of layer by the conversion means a vehicle navigation system that includes a drawing means for drawing superimposed on Viewing means, said display The part of the display screen of the means that is far from the viewpoint
Up to the road map consisting of the above detailed information
A bird's-eye view road map of the road map consisting of the wide area information
A vehicle route guidance device that is converted into and drawn . 2. The route guiding apparatus for a vehicle according to claim 1, further comprising a distance detecting means for detecting a traveling distance of the vehicle and an azimuth detecting means for detecting a traveling azimuth of the vehicle , wherein the wide area is displayed on the display means. A road map consisting of information is drawn
After the vehicle has been damaged
Is detected, or by the direction detecting means
When the rotation of the vehicle over a predetermined angle is detected, the detailed information is
Converting a road map consisting of information into a bird's eye view road map
A route guidance device for a vehicle , wherein a road map including the wide area information is updated before drawing . 3. The vehicle route guiding apparatus according to claim 2 , wherein a road map including the wide area information is drawn on the display means.
Of the vehicle over the specified distance and
If the rotation of the vehicle beyond a certain angle is not detected, see the table above.
Road map consisting of the wide area information displayed on the indicating means
In the portion near the viewpoint of the display screen of the above display means,
Change the road map consisting of detailed information to a bird's-eye view road map.
A route guidance device for vehicles, which is characterized in that it is drawn instead.