JPH06138819A - Map display device - Google Patents

Abstract

PURPOSE:To eliminate the cutting of part of a character and a symbol on an area division border line by providing both adjacent area map data with elements of character data and symbol data drawn on the area division border line of the area map data. CONSTITUTION:When characters 32-34 and symbols 35-38 are arranged on a unit 30 and an adjacent unit 31 for a map display of character and symbol data arranged on the adjacent units, both the area map data of the units 30 and 31 have data of the character 33 and symbol 37 on the unit border line among the character and symbol data. Thus, both the area map data of the units 30 and 31 adjacent each other acrossing the unit border line have the character and symbol data on the unit border line, so maps are drawn, unit by unit, to properly display the maps although there is the character and symbol on the unit border line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle map display device used in an automobile navigation system or the like.

[0002]

2. Description of the Related Art FIG. 13 shows, for example, JP-A-2-157892.
It is a block diagram which shows the conventional vehicle-mounted map display apparatus shown by the publication. In the figure, 101 is a sensor into which map data information necessary for recognizing a vehicle position is input,
Reference numeral 102 is an input unit for inputting operation information by the driver. 103 is a display position / magnification / display angle determining means 1
031, display information selection means 1032, character information analysis means 1033, non-character information analysis means 1034, display control means 1035, intersection position detection means 1036, character display position and intersection position storage means 1037, current position peripheral predetermined area determination means 1038. , Priority intersection name storage position storage means 1
039, a display area determination unit 10310, a priority drawing determination unit 10311, and a character display position determination unit 10312, and is a calculation / processing unit that performs map data calculation processing and controls map display. 104 is character information 104
1 and auxiliary storage means for accumulating non-character information 1042, and 105 is a display means for displaying a map under the control of the display control means in the calculation / control means 103.

Next, the operation will be described. When a vehicle equipped with a navigation system using such a map display device travels, the sensor 101 causes the calculation / control means 1 to operate.
Enter map data in 03. As a result, in the calculation / control means 103, the display position / magnification ratio / display angle determination means 1031 first operates, and the position of the map to be displayed and the magnification are displayed according to the input map data information and the operation information from the input means 102. Determine the rate or display angle. At this time, the magnifying power or the display angle should be adjusted so that the driver can read the map most easily according to the progress of the vehicle. For example, the magnifying power should be reduced when driving at high speed, or the traveling direction of the vehicle should be aligned with the upper part of the map. It is adjustable to.

Next, the display information selection means 1032 extracts the character information 1041 and the non-character information 1042 necessary for displaying the map from the auxiliary storage means 104 based on the determination result of the display position / magnification / display angle determination means 1031. elect. The selected character and non-character information are analyzed by the character information analysis unit 1033 and the non-character information analysis unit 1034 for display format and display position, and displayed by the display unit 105 via the display control unit 1035.

At this time, the non-character information 1042 is enlarged or reduced according to the enlargement or reduction of the map and is displayed at a position preset by the data. In particular, the intersection information is extracted by the intersection position detecting means 1036 and corresponds to it. The character display position and the intersection position storage means 1037 are registered as a character area to be displayed. Further, with respect to intersections belonging to a predetermined area around the current position, the current area peripheral predetermined area determination means 1038 extracts the intersection, and the position where the intersection name is stored is stored in the priority intersection name storage position storage means 1039. When drawing such character information, it is used to prevent conflict between characters and intersections, and to draw intersection names around the current position with priority over other character information.

On the other hand, the character information is displayed in the same size in order to make the map easy to read. Further, the display position of the character information is displayed area determination means 10310 and priority drawing determination means 10
311 and the character display position determining means 10312. That is, the character display position determining means 1031
2 retrieves the character information stored in the preferential intersection name storage position storage means 1039, and compares the coordinates "An ₁ , Bm ₁ " of the display position of the character information with the character display position and intersection position storage means 1037. Then, the above coordinates "An ₁ , B
It is determined whether or not there is already a display character in “m ₁ ”. If it is determined that there is a display character, the display position “An ₁ , Bm ₁ ” is moved to the adjacent display position “An ₂ , Bm ₂ ”, and the display position is displayed again. Check the overlapping of and determine the display position that does not overlap.

The determined display position "An ₂ , Bm ₂ "
Is the display control means 1 through the character information analysis means 1033.
It is sent to 035, is set as the position of the corresponding display character, is stored in the character display position and intersection position storage means 1037, and is used for comparison when displaying the next character.

Next, the character information display position "An ₁ , Bm ₁ " predetermined by the map data, which is analyzed by the character information analysis means 1033, and the character display area are compared to determine the character display position within the display area. Then, the character display position and the intersection storage means 1037 are compared, and “An
_It is determined whether or not there is already a character in " ₁ , Bm ₁ ". If it is determined that there is a display, “An ₁ , Bm ₁ ” is moved to the adjacent display position “An ₂ , Bm ₂ ”, and the display position is determined again by checking the overlapping or conflict of the display positions.

The determined character display position "An ₂ , Bm
₂ ”is sent to the display control means 1035 via the character information analysis means 1033 to be the display position of the corresponding character, and the character display position and intersection position storage means 103.
It is stored in 7 and used for comparison at the time of the next character display.

FIG. 14 shows an example of a map display on the display means 105. In FIGS. 14A and 14B, the enlargement ratios are X and X /, respectively.
In the case of No. 2, as shown in FIG. 14B, the relative distances of the character strings I and II, character strings III and IV of the intersection name on the display are shortened and the display conflicts and is difficult to read. Has become. In such a case, when the character string II is displayed at the same enlargement ratio X / 2 as shown in FIG. 14C, the character string II is displayed at the intersection so as not to conflict with the adjacent intersection name (character string). It is displayed by moving it from the right side to the left side. Note that the character string
The IV is excluded from the display because it is out of the priority area of the predetermined area around the current position. As described above, the conventional map display device is designed so that there is no overlap between characters and between characters and intersections.

[0011]

A conventional map display device is
With the above configuration, map data can be
If it is a collection of divided area map data,
Area that is adjacent to the area after drawing the map data
When drawing figure data, the characters and symbols on the area dividing boundary line
May be cut off, and if you rotate the map
Vertical (horizontal writing) characters in horizontal writing
(Vertical writing) The display is unintentional because it is changed to display
When drawing a map to check the overlap
It also takes longer, and the map is displayed at a scale other than the standard scale.
In case of small scale, it is necessary to check the overlap of characters and symbols at small scale.
It takes longer to draw the map, and at large scales, text and
Do not sparse the density of issues and make the map display inappropriate
Which problem was there?

The invention described in claim 1 is made to solve the above problems, and even if the characters or symbols on the area dividing boundary line of the area map data are displayed when the map is displayed. An object of the present invention is to obtain a map display device that can be displayed normally without being cut off.

It is another object of the present invention to provide a map display device in which characters are properly displayed even when a map is rotated and displayed, and the drawing time of the map can be prevented from becoming long. And

Further, according to the invention described in claim 3, even when the map is displayed at a scale different from the standard, the drawing time of the map does not become long at the small scale display, and the characters and characters are displayed at the large scale display. An object of the present invention is to obtain a map display device in which symbols are not sparsely displayed.

[0015]

According to a first aspect of the present invention, there is provided a map display device in which area map data managed and stored by the map data storage means is drawn on the area dividing boundary line of the area map data. The elements of the character data and the symbol data are included in both adjacent area map data.

The map display device according to a second aspect of the present invention is a non-rotating device used when displaying a map on the display device without rotation in the area map data managed and stored by the map data storage device. It is provided with character data and rotated character data to be used for rotating and displaying.

Further, the map display device according to the invention of claim 3 is a standard scale character used when displaying a map at a standard scale in the area map data managed and stored by the map data storage means. The symbol data and the large-scale character / symbol data used when displaying at a scale smaller than the standard scale or the small-scale character / symbol data used when displaying at a scale smaller than the standard scale are included.

[0018]

According to the first aspect of the present invention, the arithmetic / control means uses the elements of the character data and the symbol data on the area division boundary line which both of the adjacent area map data have, so that the area division boundary line can be displayed. To realize a map display device capable of displaying positioned characters and symbols without cutting part of them.

The arithmetic / control means according to the second aspect of the present invention uses the non-rotated character data when the map is displayed without rotation and the rotated character data when the map is rotated and displayed. To realize a map display device in which characters are appropriately displayed even when a map is rotated and displayed, and the drawing time of the map can be prevented from becoming long.

Further, the arithmetic / control means in the invention according to claim 3 uses the large scale character / symbol data or the small scale character / symbol data when the map is displayed at a scale other than the standard scale. A map display device in which the map drawing time does not become long when displaying at a small scale and the display of characters and symbols does not become sparse when displaying at a large scale is realized.

[0021]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a Global Positioning System (hereinafter, GPS).
A GPS antenna for receiving radio waves from a satellite, 2 is a GPS receiver for calculating the current position of a moving body by processing the signal received by the GPS antenna 1.
3 is a direction sensor that detects the traveling direction of the moving body, and 4 is a wheel speed sensor that detects the moving speed of the moving body. Reference numeral 5 is a current position detecting means for obtaining the current position of the moving body based on the information output from the GPS receiver 2, the direction sensor 3 and the wheel speed sensor 4. Reference numeral 6 is an input means for inputting operation information for operating the operation of the entire system, 7 is a map display angle determination means for determining a display angle of a map based on the operation information from the input means 6, and 8 is also input. The map display scale determining means determines the display scale of the map based on the operation information from the means 6. Reference numeral 9 denotes a map data storage means for managing and storing the area map data divided into areas for the purpose of map drawing and display for each area, and 10 reads necessary area map data from the map data storage means 9, and It is a means for reading and temporarily storing map data and temporarily storing map data. Reference numeral 11 gives an instruction to the map data reading and map data temporary storage means 10 according to the information output from the current position detection means 5, the map display angle determination means 7, and the map display scale determination means 8 to draw a map and its It is a map data selection and map drawing means for controlling. Reference numeral 12 is a display control means for controlling the display of a map or the like by a signal output from the map data selection and map drawing means 11, and 13 is the display control means 12
It is a display unit that receives a display signal output from the display unit and displays a map or the like. Reference numeral 14 comprises the current position detecting means 5, the map display angle determining means 7, the map display scale determining means 8, the map data reading and map data temporary storing means 10, the map data selecting and map drawing means 11, and the display control means 12. , Means for displaying map by performing map data calculation processing 1
3 is a calculation / control means for controlling the display on the display 3.

FIG. 2 is an explanatory diagram showing the structure of map data managed and stored in the map data storage means 9. FIG. 2A shows an image obtained by dividing the area of the map stored in the map data storage means 9 in mesh units (for example, secondary mesh units). Figure 2 (a)
If there are i meshes in the longitude direction and j meshes in the latitude direction, there are i × j meshes. Further, as shown in FIG. 2B, each mesh is divided into eight in the longitude direction and the latitude direction to divide into 64 units. As a result, the area map data corresponding to the mesh becomes an array of mesh data as shown in FIG. 2C, and the area map data corresponding to the unit is shown in FIG.
The unit data is arranged as shown in (d).

Next, the structure of the unit data is shown in FIG.
Will be described with reference to. As shown in FIG. 3A, the unit data represents background plane data representing the surface of the sea, lakes and ponds, green spaces, etc., background line data representing the lines of rivers, railways, administrative boundaries, etc., and roads. Road line data, character data representing characters such as place names, facility names, and intersection names, and symbol data representing symbols such as facilities.
Each of the data is composed of a plurality of records.
FIG. 3B shows the structure of the character data. For character data, one character data record is created for each character string, and each character data record includes the color of the character string, the direction of the character string indicating vertical writing or horizontal writing, the number of characters in the character string, the coordinates of the first character,
And a character string (a sequence in which each character is represented by a shift JIS code). Next, FIG. 3C shows the structure of the symbol data. One symbol data record is created for each symbol of the symbol data, and the symbol data record is the symbol color,
It is composed of the coordinates of the symbol and the code of the symbol.

FIG. 4 is an explanatory diagram showing an example of a map display in which character / symbol data is arranged on adjacent units. As shown in FIG. 4, a character 32, a character 33, a character 34, and a symbol 3 are provided on the unit 31 adjacent to the unit 30.
When 5, 5, symbol 36, symbol 37 and symbol 38 are arranged, the data of the character 33 and symbol 37 on the unit boundary line among these character / symbol data is the unit 3
The area map data of both 0 and the unit 31 will be held.

Next, the operation will be described. Here, FIG.
3 is a flowchart showing a flow of map drawing and display operations in the first embodiment. The map data selection and map drawing means 11 starts the processing shown in FIG. 5 when information is input from the current position detection means 5, the map display angle determination means 7, or the map display scale determination means 8. Hereinafter, FIG. 5 will be described. First, in step ST1, the inputted information is judged. When it is determined in step ST1 that the current position of the moving body is input, the information of the current position of the moving body is updated in step ST2, and then the process proceeds to step ST5. If it is determined in step ST1 that the map display angle is input, the map display angle information is updated in step ST3, and then the process proceeds to step ST5. Similarly, when it is determined in step ST1 that the map display scale is input, the map display scale information is updated in step ST4, and then the process proceeds to step ST5.
In step ST5, it is determined whether or not the map can be displayed with the already drawn map. If it is determined in step ST5 that the map can be displayed, the process proceeds to step ST9, the map display position is changed, and the process ends. On the other hand, if it is determined in step ST5 that the map cannot be displayed, the process proceeds to step ST
Go to 6. In this step ST6, it is determined whether or not the map data can be read and updated with the unit data already read by the map data temporary storage means 10. If it is determined in step ST6 that map drawing is possible, the process proceeds to step ST8 to perform map drawing, and then the process returns to step ST5. Also, step S
If it is determined at T6 that the map cannot be drawn, the process proceeds to step ST7, the map data is read, and the process returns to step ST6. The reading of the map data in step ST7 and the drawing of the map in step ST8 are performed in units of units.

Next, details of map drawing will be described with reference to FIG. In FIG. 6A, reference numeral 50 is an area for drawing a map, which is a frame memory capable of drawing nine units. First, a unit including the current position (Xc, Yc) of the moving body input from the current position detection means 5 is drawn in the center of the drawing area. Then, the units adjacent to the unit are sequentially drawn. The current position (Xc, Yc) of the moving body when the map drawing of 9 units is completed
A map centered on can be displayed. Figure 6 (b)
The map display is shown in. As shown in Fig. 6 (b), there are characters and symbols located on the unit boundary line, but as described in Fig. 4, on the unit boundary line both in the area map data of the units adjacent to each other across the unit boundary line. Character of
Since it has symbol data, it is possible to display the map appropriately by drawing the map for each unit.

Example 2. In the first embodiment described above, the case where the data of the area map data of both units adjacent to each other across the unit boundary line is the character data and the symbol data has been described. When the line data is drawn in such a manner, the line data also extends over the unit boundary line, and thus such line data may be added as a target of data held by both area map data of adjacent units.

Example 3. Next, a third embodiment of the present invention will be described with reference to the drawings. The configuration of the map display device and the structure of the map data according to the third embodiment are the same as those of the first embodiment shown in FIGS. 1 and 2, and are managed and stored by the map data storage means 9 in FIG. The structure of each unit data of the map data is shown. This unit data is shown in Figure 7.
As shown in (a), the structure is similar to that of the first embodiment. As shown in FIG. 7B, one character data record is created for each character string, and each character data record has a character string color, a character string direction, a non-character It consists of a rotated character string, the number of characters in the rotated character string, the coordinates of the first character, and a non-rotated and rotated character string (a sequence of character codes). The structure of the symbol data is shown in FIG. 7 (c).
As shown in, the structure is the same as that of the first embodiment.

FIG. 8 is an explanatory view showing a display example of a map during non-rotation and during rotation. FIG. 8A shows an example of map display during non-rotation and 90 degrees in FIG. 8B. An example of the map display during rotation is shown. Regarding the drawing of characters in the map drawing of FIG. 8A, the non-rotating character string is used for drawing, and for the drawing of characters in the map drawing of FIG. 8B, the rotating character string is used. draw. In order to prevent the relative position to the map from changing when drawing characters during rotation, the vertical character string in the non-rotated state is 9
A character is drawn horizontally when it is rotated by 0 degree (or 270 degrees), and a character string that is horizontally written in a non-rotated state is drawn by vertically when it is rotated by 90 degrees (or 270 degrees).

Since the basic flow of map drawing and display operations in the third embodiment proceeds in the same manner as in the first embodiment according to the flowchart shown in FIG. 5, the description thereof will be omitted and the map drawing will be omitted. Will be described in detail with reference to FIG. In FIGS. 9A and 9B, reference numeral 50 is a region for drawing a map, which is a frame memory capable of drawing nine units. FIG. 9A is an explanatory diagram showing a map drawing method when the map is displayed without being rotated. First, a unit including the current position (Xc, Yc) of the moving body input from the current position detection means 5 is drawn in the center of the drawing area. Then, the units adjacent to the unit are sequentially drawn. When the map drawing of the nine units is completed, a map centering on the current position (Xc, Yc) of the moving body can be displayed. Further, FIG. 9B shows a map 9
It is explanatory drawing which shows the method of map drawing at the time of rotating a 0 degree and displaying a map. Similar to the case of displaying a map without rotation, a unit including the current position (Xc, Yc) is selected and rotated 90 degrees to draw a map. However, character drawing is performed using the number of characters in the rotated character string and the rotated character string (sequence of character codes).

Example 4. Next, a fourth embodiment of the present invention will be described with reference to the drawings. Also in this case, the structure of the map display device and the structure of the map data are the same as those of the first embodiment shown in FIG. 1 or 2. Here, FIG. 10 is an explanatory view showing the structure of each unit data of the map data managed and stored in the map data storage means 9 of the fourth embodiment. This unit data basically has the same structure as that of the first embodiment as shown in FIG. 10A, but character data is standard scale character data, large scale character data, and small scale character data. The difference is that the symbol data consists of standard scale character data, standard scale symbol data, large scale symbol data, and small scale symbol data. The structure of the character data is as shown in FIG. 10B, and the structure of the symbol data is as shown in FIG.

FIG. 11 is an explanatory diagram showing an example of a map displayed at each scale. FIG. 11 (a) shows an example of a standard scale map display, and FIG. 11 (b) shows a scale larger than the standard scale. 11C shows an example of the map display of a smaller scale than the standard. Regarding the drawing of characters and symbols in the map drawing shown in FIG. 11A, character data for standard scale and symbol data for standard scale are used for drawing. Figure 11
Regarding the drawing of characters and symbols in the map drawing shown in (b), drawing is performed using large-scale character data and large-scale symbol data, and regarding drawing of characters and symbols in the map drawing shown in FIG. , Draw using small-scale character data and small-scale symbol data.

Since the basic flow of map drawing and display operations in the fourth embodiment proceeds in the same manner as in the first embodiment according to the flowchart shown in FIG. 5, the description thereof will be omitted and the map drawing will be omitted. Will be described in detail with reference to FIG. In FIGS. 12A and 12B, reference numeral 50 denotes a region for drawing a map, which is a frame memory capable of drawing nine units. FIG. 12A is an explanatory diagram showing a map drawing method when a map is displayed at a standard scale. First, a unit including the current position (Xc, Yc) of the moving body input from the current position detection means 5 is drawn in the center of the drawing area. Then, the units adjacent to the unit are sequentially drawn. When the map drawing of the nine units is completed, a map centering on the current position (Xc, Yc) of the moving body can be displayed. FIG. 12B is an explanatory diagram showing a map drawing method when a map is displayed at a size twice as large as the standard scale (large scale). As with the standard scale, the unit including the current position (Xc, Yc) is drawn in a size twice the normal size. However, for drawing characters and symbols, large-scale character data and large-scale symbol data are used. The same applies to small scales.

[0034]

As described above, according to the invention described in claim 1, the area map data managed and stored by the map data storage means is the character data or the symbol data drawn on the area dividing boundary line. Since the element is configured to be included in both adjacent area map data, even if a character or symbol is located on the area dividing boundary, it is possible to display it normally without cutting part of it. There is an effect that a possible map display device can be obtained.

According to the second aspect of the invention, the area map data managed and stored by the map data storage means is rotated with the non-rotated character data used when the map is displayed without rotation. Since it is configured to have rotated character data that is used when displaying the map, the characters are displayed properly even when the map is rotated and displayed, and there is no need to check for overlapping characters. There is an effect that a map display device that can prevent the occurrence of the problem can be obtained.

Further, according to the invention of claim 3,
The area map data managed and stored by the map data storage means is the standard scale character / symbol data used when displaying the map at the standard scale, and the large scale character used when displaying at a scale other than the standard scale. Since it is configured to have symbol data, or character / symbol data for small scales, map drawing time does not increase even when displaying at small scales, and characters and symbols are displayed even when displaying at large scales. There is an effect that a map display device that does not become sparse can be obtained.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a structure of map data in a map data storage unit in the above embodiment.

FIG. 3 is an explanatory diagram showing a structure of unit data in the embodiment.

FIG. 4 is an explanatory diagram showing a display example of a map in the above embodiment.

FIG. 5 is a flowchart showing a flow of operation of drawing and displaying a map in the above embodiment.

FIG. 6 is an explanatory diagram for explaining a map drawing method in the above embodiment.

FIG. 7 is an explanatory diagram showing a structure of unit data according to the third embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a display example of a map in the above embodiment.

FIG. 9 is an explanatory diagram for explaining a map drawing method in the above embodiment.

FIG. 10 is an explanatory diagram showing a structure of unit data according to the fourth embodiment of the present invention.

FIG. 11 is an explanatory diagram showing a display example of a map in the embodiment.

FIG. 12 is an explanatory diagram for explaining a map drawing method in the above embodiment.

FIG. 13 is a block diagram showing a conventional map display device.

FIG. 14 is an explanatory diagram showing a display example of the map.

[Explanation of symbols]

 9 map data storage means 13 display means 14 calculation / control means

Claims (3)

[Claims] 1. Map data storage means for dividing map data into a plurality of areas intended for map drawing / display, and managing and storing each area as area map data.
Display means for displaying a map based on the area map data, and operation / control for reading area map data to be displayed from the map data storage means and performing arithmetic processing to control display of the map on the display means. A map display device having means for drawing the area map data managed and stored in the map data storage means on the area dividing boundary line of the area map data when displaying the map on the display means. A map display device characterized by having elements of character / symbol data to be displayed in both area map data that are adjacent to each other with the area dividing boundary line in between. 2. Map data storage means for dividing the map data into a plurality of areas intended for map drawing / display, and managing and storing each area as area map data.
Display means for displaying a map based on the area map data, and operation / control for reading area map data to be displayed from the map data storage means and performing arithmetic processing to control display of the map on the display means. In the map display device having means, the area map data managed and stored in the map data storage means is rotated with non-rotated character data used when the map is displayed on the display means without rotation. A map display device having rotation character data used for displaying as a map. 3. Map data storage means for dividing the map data into a plurality of areas intended for map drawing / display, and managing and storing each area as area map data.
Display means for displaying a map based on the area map data, and operation / control for reading area map data to be displayed from the map data storage means and performing arithmetic processing to control display of the map on the display means. In the map display device having means, the area map data managed and stored in the map data storage means is a standard scale character used when displaying a map on the display means at a standard scale.
To have symbol data and character / symbol data for large scale used when displaying at a scale larger than the standard scale, or character / symbol data for small scale used when displaying at a scale smaller than the standard scale. Characteristic map display device.