JPH0545956B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a map display device that displays a road map on a display means. [Prior art] Conventionally, this type of device is disclosed in Japanese Patent Application Laid-open No. 58-10781;
There is a map display device disclosed in Japanese Patent Laid-Open No. 57-186111, etc., which displays a map using map display data that corresponds one-to-one with the display on the display means, that is, so-called pattern (image) data. [Problems to be Solved by the Invention] However, since the above-mentioned conventional map display device displays the map using the above-mentioned image data, it is difficult to change the display form of the map display, for example, to enlarge the map display in the same area. , reduction, etc. requires the preparation of map data for the change, and there are considerable limitations on the degree of freedom in changing the display form. The present invention has been made in view of the above-mentioned problems, and instead of providing a unique map display using image data as shown in the above-mentioned prior art, the present invention increases the degree of freedom in changing various display formats by commonly using the same data. The purpose of the present invention is to provide a map display device that can. [Means for achieving the object] In order to achieve the above object, in the first invention of the present application, connecting lines are displayed between a plurality of constituent points for forming a route, as shown in Fig. 1. A map display device configured to display a route and display a map using a plurality of combinations of the routes, the device comprising: display means for displaying the map; and display means for displaying each of the plurality of constituent points for forming the route. , a storage means for storing coordinate data specifying those points in a first coordinate system; and an extraction means for extracting coordinate data of a plurality of constituent points in the first coordinate system from the storage means; a coordinate conversion means for converting coordinate data of a plurality of constituent points extracted by the extraction means into coordinate data of a second coordinate system determined for map display on the display means; A plurality of constituent points on the second coordinate system defined by the coordinate data subjected to the coordinate transformation are connected for each route to form a plurality of routes, and the plurality of routes are displayed on the display means. A technical means is adopted that includes: a map display control means for displaying a map; Further, in the second invention of the present application, the storage means stores, for each of the routes forming a map by a combination of display of a plurality of routes, each of a plurality of constituent points for forming each route. For each of the routes, the coordinate data that specifies the points in the first coordinate system is used; A technical means is adopted in which coordinate data of a plurality of constituent points in the first coordinate system is extracted for each route. [Effect of the Invention] In the first invention of the present application, when displaying a map by combining a plurality of routes, each of the plurality of constituent points forming the routes is displayed in the first coordinate system. These points are stored as coordinate data for specifying them, and the displayed map is constructed by converting these coordinate data into coordinate data of a second coordinate system determined for displaying the map. Therefore, the same data can be used in common for various display formats, and there is an excellent effect that the degree of freedom in changing the display format can be increased. Furthermore, in the second invention of the present application, the coordinate data of the plurality of constituent points is stored for each route, and the stored coordinate data is extracted for each route, so that the display Since it is possible to select routes to be selected on a route-by-route basis, and the processing when displaying connecting lines is facilitated, there is an excellent effect that the degree of freedom in changing the display form can be further increased. [Example] The present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing this embodiment. In FIG. 2, 1 is a display as a display means for displaying a map, and 2 is a map data storage medium in which predetermined map data, which will be described later, is stored in advance. 7 is an operation unit, which is used by the driver etc. when using the travel guidance system;
Reference numeral 8 is a direction sensor, which detects the traveling direction of the vehicle, that is, the geomagnetic direction relative to the own vehicle, and reference numeral 9 is a distance sensor, which detects the travel distance of the vehicle. 10 is a control device, which includes a CPU, ROM,
It is equipped with a microcomputer 10-1 consisting of RAM, I/O, etc., and a display controller 10-2, and functionally executes arithmetic processing and display control. The operation unit 7 has an enlargement key for instructing to enlarge the currently displayed map, that is, the currently displayed map, by one rank, a reduction key for reducing the currently displayed map by one rank, and a reduction key for making the currently displayed map sparse by one rank. It has a sparse key for , and a dense key for making the currently displayed map one rank denser. The orientation sensor 8 is a permalloy core on a ring,
It includes an excitation coil and two coils orthogonal to each other, and outputs an azimuth signal to the control device 10 for detecting the traveling direction of the vehicle relative to the earth's magnetism based on the output voltages of the two coils. The distance sensor 9 indirectly detects the rotation of the speedometer cable as an electrical signal using a reed switch, magnetic sensing element, or photoelectric conversion element, or detects the rotation of the output shaft of the transmission as an electrical signal using the same means as described above. A distance signal used in calculating the distance traveled by the vehicle is output to the control device 10. The map data storage medium 2 is a ROM (Read Only
Memory) consists of a package. The data structure of the map data stored in advance in the map data storage medium 2 is, for example, as shown in FIG. , a route information column 13 related to routes such as national highways, and an article information column 14 related to various services. The point information string 12 has prefecture point information strings for prefectures belonging to the region, such as the Aichi prefecture point information string 15 for Aichi Prefecture. It has city point information strings for cities belonging to the prefecture, such as Nagoya city point information string 16 for Nagoya city to which it belongs, and among the city point information strings, for example, Nagoya city point information string 16 is the main points belonging to Nagoya city. Point information about 17-1, 17
-2, . . . , and each point information 17-1, 17-2 consists of information on the point number, point level, point type, and the X and Y components of the earth coordinates of the point. The route information string 13 includes #1 route information string 18-1, #2 route information string 18-2, . . .
#N route information string 18-N and pointers 19-1, 19-2, ..., 19 that correspond one-to-one to these route information strings 18-1, 18-2, ..., 18-N
-N, each route information string 18-1, 18
-2, . . . , 18-N consists of a route number, a route level, a route type, a group of point numbers for points forming the route, and the end of the route. The article information column 14 includes an intersection name information column 20-1, a route name information column 20-2, ..., a landmark name information column 20-
M, and these name information strings 20-1, 20-2,
..., 20-M corresponds one-to-one with pointer 21-
1, 21-2, ..., 21-M, and the intersection name information string 20-1 is intersection information 21-1, 21-2, ..., including point number, name level, and intersection name.
The route name information string 20-2 has a route information group consisting of route information 22-1, 22-2, etc. of route number, name level, and route name, and landmark name information. Row 20-M
is landmark information 2 of point number, name level, and landmark name
It has a landmark information group consisting of 3-1, 23-2, . Here, the above route types are national roads, expressways,
It indicates the type of route such as general road, railway, coastline, etc. The above point types include general intersection, grade-level intersection of general road, interchange,
This indicates the type of fee, such as an intersection between a general road and an expressway, or an intersection between a general road and a railway. The control device 10 receives an instruction signal from the operation unit 7, a direction signal from the direction sensor 8, a distance signal from the distance sensor 9, and map data from the map data storage medium 2, and performs a predetermined process as described later in FIG. In addition to executing the processing, it also performs display control on the display 1 and outputs a video signal to the display 6. Display 1 is CRT (Cathode Ray Tube)
A map and the like are displayed on the display screen by a video signal from the control device 10. In the above configuration, the relationship between the level information in the map data on the map data storage medium 2 and the size specified by key operation is as shown in the following table (a).

[Table] To be more specific, if size 0, which corresponds to a scale of 1/1 million, is specified by operating the enlargement key or reduction key, only routes and points for which "0" is given as level information in advance will be displayed. If size 1, which corresponds to a scale of 1/500,000, is specified as an object that can be displayed on display 1, only routes and points whose level information is "0" or "1" will be displayed, and other The relationship between the size specification and the display target is also the same as above. Normally, the relationship between size and level is as shown in table (a) above, but when a sparse key or a dense key is operated, the relationship between the two is determined by one operation of each key. ), (c) are updated. Note that the table (b) corresponds to the case where the secret key is operated once.

【table】

[Table] To be more specific, for example, if a sparse key is operated once when a map corresponding to size 3 is currently displayed, the previous level will be set to "0",
Points or routes with levels ``1'', ``2'', or ``3'' were to be displayed, but points or routes with levels ``0'', ``1'', or ``2'' were displayed. Therefore, level 3 points or routes are excluded from display targets, and the displayed map becomes sparse. On the other hand, when the secret key is operated once while a map designated as size 3 is displayed, a new level "4" point or route is added to the display target.
The displayed map becomes denser. Next, an example of the transition of the display form of the display 1 will be described with reference to FIGS. 4a to 4c and 5a to 5c. When it is specified that the displayed map should be enlarged by the operator's key operation or the internal processing of the control device 10,
For example, if a map as shown in FIG. 4a is currently being displayed, the control device 10
The enlargement process is performed on the area A surrounded by the broken line in the figure, and the map on the first screen of the display is relatively detailed as shown in FIG. 4b, for example. After that, when further enlargement is specified, the enlarging process for the broken line enclosing area B in Fig. 4b is executed, and a more detailed map as shown in Fig. 4c is displayed on the display 1 screen. Make it. Note that points a and b in FIG. 4a represent the same points as points a and b in FIG. 4b, respectively, and points a to h in FIG. 4b represent the same points as points a to h in FIG. 4c, respectively. On the other hand, when it is specified that the displayed map should be reduced, a transition in the display form is performed that is opposite to the transition in the display form caused by the enlargement process as described above. That is, the display map shown in Fig. 4c is changed to the display map shown in Fig. 4b,
Furthermore, the display map is changed to that shown in FIG. 4a. Further, when it is specified that the displayed map should be made denser by the operator's key operation or by the internal processing of the control device 10, if the map shown in FIG. 5a is currently being displayed, the control device 10 Densification processing is executed so that a comparatively detailed map as shown in FIG. 5b, for example, is displayed on one screen of the display. After that, when further densification is specified, further densification processing is executed, for example, the 5th c.
A more sophisticated map as shown in the figure is displayed. Note that points a' to g' in Fig. 5a represent the same points as points a' to g' in Fig. 5b, respectively, and points a' to o' in Fig. 5b respectively represent points a' to g' in Fig. 5c. It represents the same point as o′. On the other hand, when it is specified that the displayed map should be made sparse, a transition in the display format is made that is opposite to the transition of the display form due to the densification process as described above. That is, the displayed map shown in FIG. 5c is changed to the displayed map shown in FIG. 5b,
Furthermore, the display map is changed to that shown in FIG. 5a. Next, the processing operation of this embodiment will be explained with reference to the schematic flowchart shown in FIG. Note that the following explanation will be given by taking as an example a case where enlargement is specified by an operator's key operation. When the operator operates the enlargement key of the operation section 7, the microcomputer 10-1 of the control device 10 starts processing as shown in FIG. First, step 101 is executed to read out the contents of the head pointer 19-1 in the route information string 13 of the map data storage medium 2. Next, step 102 is executed and all pointers 19-
It is determined whether the contents of 1 to 19-N have been read. At this point, the contents of the head pointer 19-1 have just been read, so the judgment result is "NO".
Then, step 103 is executed. In step 103, the root level information of the #i root information string (#1 root information string 18-1) pointed to by the #i pointer (first pointer 19-1 at this point) is read. Here, the root level information can be thought of as the relative importance assigned to each route. Next, step 104 is executed to determine whether the root level is a displayable level, in other words, the #i root (#1 root) has the importance to be displayed for the specified size as described above. Determine whether it is the root or not. If the #i route (#1 route) is a route that does not need to be displayed, step 105 is executed to update the pointer, that is, read the contents of the next pointer (#2 pointer 19-2), and step 102 is executed.
Return to On the other hand, if #i route (#1 route) is the route to be displayed, then step 106 is executed,
#i route information string (#1 route information string 18-1)
Read route type information. Next, step 107 is executed to read the point number information (at this point, the first point number information) of the #i route information string (#1 route information string 18-1). Next, step 108 is executed to determine whether the route end information of the #i route information sequence (#1 route information sequence 18-1) has been read out. At this point, since the first point number information has just been read out, the judgment result is "NO", and then step 109 is executed to find the point information string 12 that matches the point number (first point number). Reads the point level information given to the point number,
It is determined whether the point has a degree of importance that should be displayed for the specified size as described above. Even if this point is not displayed, if it is a good point, the process returns to step 107 and reads out the next point number in the #i route information string (#1 route information string 18-1). On the other hand, if this point is the point to be displayed, then step 110 is executed to determine whether it is the first point number extracted in the #i route information string (#1 route information string 18-1). to judge. At this point, since it is the first point number, the judgment result is "YES" and the next step is step 111.
to 114, read the earth coordinate X component and earth coordinate Y component of this point, convert this earth coordinate point (X, Y) to a display coordinate point (X1, Y1),
Furthermore, the area A to which the display coordinate point (X1, Y1) belongs is determined. The above coordinate conversion process is performed using the seventh coordinate system representing the earth coordinate system.
As shown in Figure A and Figure 7B showing the display coordinate system, first, (1) the shaded area in the display coordinate system (corresponding to the map display area of the display 1);
(MPOS,
(BPOS), then (2) the found point (MPOS,
Displays the earth coordinates (LPOS, APOS) of the current target point based on the coordinate system point (X1,
Coordinate transformation to Y1). Here, the above points (MPOS, BPOS) are obtained as follows. First, the current location or the center point of the administrative district point group in the case of administrative district designation (9th
Figure a) is determined as the display map center coordinates (MAPCENX, MAPCENY) in the earth coordinate system, and then this coordinate information MAPCENX, MAPCENY,
Number of dots a and b on the map display screen of display 1
(Figure 9b), the number of dots per unit longitude LDOT determined according to the specified size, and the number of dots per unit latitude ADOT are used as parameters: MPOS=MAPCENX-b/LDOT BPOS=MAPCENY+a/ADOT Find the point (MPOS, BPOS) from The point (X, Y) is found from the following equation: X1=(LPOS−MPOS)×LDOT Y1=(BPOS−APOS)×ADOT. The coordinates of the center point of the administrative district designation map shown in Figure 9a can be calculated from the earth coordinates of the four points (α, β, γ, δ) of the administrative district at the east end, west end, north end, and south end using the following formula MAPCENX = ( It is determined by MAPCENY = (Longitude of the eastern edge - Latitude of the western edge)/2 MAPCENY = (Latitude of the northern edge - Latitude of the southern edge)/2. On the other hand, the above region determination process uses the display coordinate points (X1, Y1) obtained by the coordinate conversion process as described above.
This is done by determining to which region 0 to 0 belongs, as shown in FIG. 8a. In addition, in this Figure 8a,
The area corresponds to the hatched area shown in FIG. 7b, that is, the map display area. Display coordinate point (X1, Y1) in step 114 mentioned above
When the area A to which the
-1) Read the next point number. Next, step 108 is executed and it is determined whether the route has ended or not. If the route has not ended, the next step is executed.
109 is executed, and it is determined whether the point level of this point number is a displayable level or not. If it is not a displayable level, the process returns to step 107. On the other hand, if it is a displayable level, step 110 is executed next. death,
It is determined whether this point number is the first point number extracted in the #i route information string (#1 route information string 18-1). At this point, the first point number has already been extracted, so the judgment result is "NO", and steps 115 to 118 are then executed sequentially, and the same process as steps 111 to 114 above is performed. Processing takes place. In other words, this point number (#j
Convert the earth coordinates (X, Y) of the point number) to display coordinates (X2, Y2), and also display the display coordinates (X2, Y2).
Find region B to which Y2) belongs. Next, step 119 is executed to determine whether or not to perform a connected display of points (X1, Y1) and points (X2, Y2), that is, whether or not the above region A and the above region B have a specific relationship. to judge. Here, this judgment process is performed, for example, as shown in FIGS. 8a and 8b.
The display coordinates (X1, Y1) are in the 0th area, and the other display coordinates (X2, Y2) are in the 0th area...
If it belongs to any of the areas, it does not have a specific relationship (indicated by the x mark in Figure 8b).
If the display coordinates (X1, Y1) belong to the 0th area, and the other display coordinates (X2, Y2) belong to the 0th area,
, , , it is determined that there is a specific relationship (indicated by a circle in FIG. 8b). Other combinations are as shown in FIG. 8b. If area A and area B do not have a specific relationship, then steps 120 to 121 are executed;
Area updating processing is performed to change area A to area B, and coordinate updating processing is performed to change coordinates (X1, Y1) to (X2, Y2), and the process returns to step 107. On the other hand, if there is a specific relationship, then execute step 122 and connect the points (X1, Y1) and (X2, Y2).
The connection line with the route is displayed on the display screen according to the route type. That is, for example, #i route (#1 route)
If the route is a national highway, the route is displayed with higher brightness than other routes. Then, steps 120 and 121 are executed to perform area update processing and coordinate update processing, and the process returns to step 107. Thereafter, until the end of route #i route (#1 route) is read, the route consisting of steps 107, 108, and 109, or steps 107, 108, and 109 plus steps 110, 115, or 122 (in some cases, 122) ) is selected and executed, and the route for #i route (#1 route) is displayed. When the end of route #i route (#1 route) is read out, the determination result in step 108 is reversed to "YES", so step 105 is executed next, the pointer is updated, and the next route ( The processing for route #2) is performed in the same way as the processing for route #1. Thereafter, the same processing as described above is sequentially executed for each route information string, and when the processing for #N route information string 18-N is completed, it is determined in step 102 that the contents of all pointers have been read,
The process shown in FIG. 6 is completed. As is clear from the above description, the control device 10
When receiving an enlargement designation from the switching means, for example, the operation unit 7, the map data storage medium 2 selects a route having a level corresponding to the designation from among the route information strings in the map data storage medium 2 and corresponds to the designation. Extract points with a level, perform coordinate transformation on the extracted points, judge whether two adjacent points have a specific relationship, and if they have a specific relationship, change the coordinates according to the route type. Connects and displays two points using brightness. Therefore, when the display mode is the scale mode of enlargement or reduction, the display pattern as shown in FIGS. 4a to 4c can be displayed in the sparse,
If it is in the dense mode, see Figures 5a to 5.
A display pattern as shown in Figure c can be obtained. Note that the display is not limited to CRT, but can also include liquid crystal,
It may be a display device such as EL. Further, although ROM is shown as the map data storage medium, magnetic tape, magnetic disk, magnetic valve, etc. may also be used. Needless to say, in this case, a reading device is required to read the map data. Furthermore, although a direction sensor that detects the earth's magnetic field is shown, a gyro type sensor that detects the relative direction of movement of the vehicle may also be used. Further, in the above embodiment, the earth coordinates are given as absolute longitude and absolute latitude, but the present invention also includes cases in which the coordinates of a point are expressed as spherical coordinates for a specific point (for example, Tokyo) or orthogonal coordinates for a specific point. . Note that the correspondence relationship between the above embodiment and the first invention and second invention of the present application is as follows. That is,
The display 1 in the embodiment corresponds to a display means, the map data storage medium 2 corresponds to a storage means,
Steps 111 and 112 of the flowchart in Figure 6.
115 and 116 correspond to extraction means, and steps 113 and 117
corresponds to the coordinate transformation means, and steps 114, 118,
119 and 122 correspond to map display control means.

[Brief explanation of drawings]

Figure 1 is a diagram showing the overall configuration of the present invention, Figure 2 is a diagram showing the overall configuration of the present invention.
Figures 8 to 8b show an embodiment of the present invention, Figure 2 is a block diagram, Figure 3 is a configuration diagram of map data, and Figures 4a to 4c are display formats when the display mode is scale mode. Figures 5a to 5c are diagrams showing the display form when the display mode is density mode, Figure 6 is a flowchart for explaining the processing operation, and Figures 7a and 7b are Figures 8a and 8b are diagrams for explaining the coordinate transformation from the earth coordinate system to the display coordinate system, Figures 8a and 8b are diagrams for explaining the connection conditions between two points in the display coordinate system, and Figure 9a
Figures 9 and 9b are explanatory diagrams for explaining a method for determining the earth coordinates (MPOS, BPOS) corresponding to the origin (0, 0) of the map display screen. DESCRIPTION OF SYMBOLS 1...Display, 2...Map data storage medium, 7...Operation unit, 8...Direction sensor, 9...Distance sensor, 10...Control device.

Claims (1)

[Scope of Claims] 1. A map display device that displays a route by displaying connecting lines between a plurality of constituent points for forming a route, and displays a map using a plurality of combinations of the routes, comprising: display means for displaying a map; storage means for storing each of the plurality of constituent points for forming the route as coordinate data specifying those points in a first coordinate system; an extracting means for extracting coordinate data of a plurality of constituent points in the coordinate system from the storage means; and an extracting means for extracting coordinate data of a plurality of constituent points in the coordinate system of a coordinate conversion means for converting coordinates into coordinate data of a second coordinate system; and a coordinate conversion means for converting coordinates into coordinate data of a second coordinate system; map display control means for connecting each route to form a plurality of routes, and displaying the map on the display means by displaying the plurality of routes. 2. The coordinate conversion means has an area specifying means for specifying an area in the first coordinate system corresponding to a map displayed on the display means, and the area specified by the area specifying means and the second coordinate The map display device according to claim 1, wherein the coordinate transformation is performed based on a relationship with a system. 3. The map display device according to claim 2, wherein the area specifying means specifies the area based on the coordinates of the center point of the area and the size of the area. 4. A display means for displaying a map, and for each of the routes constituting a map by a combination of displays of a plurality of routes, each of the plurality of constituent points for forming each route is displayed in the first a means for storing coordinate data specifying the points in the coordinate system of the coordinate system; an extraction means for extracting for each route; and coordinate conversion of the coordinate data of the plurality of constituent points extracted by the extraction means into coordinate data of a second coordinate system determined for map display on the display means. A plurality of routes are formed by connecting, for each of the routes, a plurality of constituent points on the second coordinate system defined by a coordinate transformation means and coordinate data transformed by the coordinate transformation means. A map display device comprising: , map display control means for displaying a map on the display means by displaying the plurality of routes. 5. The coordinate conversion means includes an area specifying means for specifying an area in the first coordinate system corresponding to a map displayed on the display means, and the area specified by the area specifying means and the second coordinate 5. The map display device according to claim 4, wherein the coordinate transformation is performed based on a relationship with a system. 6. The map display device according to claim 5, wherein the area specifying means specifies the area based on the coordinates of the center point of the area and the size of the area.