JP4068637B2 - Map display system, map display device, and map display method - Google Patents

Description

  The present invention relates to a map display device and a map display method for displaying a map in a navigation system or the like, and in particular, based on the length and the length of a road name, extracting the longest road link from road links to be displayed. The present invention relates to a map display device and a map display method that display a road name so as to be linear along a road within a predetermined range.

2. Description of the Related Art Conventionally, a navigation device and a navigation system that guide a user by searching for a route from a desired departure place to a destination using map data and road data are known.
As such a navigation device and navigation system, a car navigation device (hereinafter referred to as “car navigation”) that is installed in an automobile and guides a route to a driver, a route search request is sent to a route search server using a mobile phone as a navigation terminal. A communication type navigation system that receives the result and receives route guidance has been put into practical use.

  The car navigation system uses a GPS (Global Positioning System), receives GPS signals transmitted from a plurality of GPS satellites orbiting the earth with a GPS antenna, and transmits the GPS signals to the GPS signals. The position is specified by analyzing the satellite position and clock information included. At least four GPS satellites are required. The single positioning accuracy of GPS is generally over 10 m, but it is improved to 5 m or less by adopting DGPS (Differential GPS). In particular, a positioning unit that is currently installed only in some mobile phones, for example, a GPS receiver that receives a signal from a GPS (Global Positioning System) satellite and performs positioning, is called the third generation. Mobile phones tend to be installed in all models.

  A general navigation device, a route search device and a route search method used in a communication navigation system are disclosed in, for example, the following Patent Document 1 (Japanese Patent Laid-Open No. 2001-165681). This navigation system is configured to send information of departure and destination from a portable navigation terminal to a route search server, and search and guide a route that matches a search condition from road network and traffic network data by the route search server. Has been. As the search condition, there are means for moving from the departure place to the destination, for example, walking, automobile, combined use of railroad and walking, and the route is searched as one of the search conditions.

  The route search server uses roads (routes) of map data as nodes and node positions as the nodes, links connecting the nodes as links, and cost information (distance and required time) for all links as a database. ing. Then, the route search server refers to the database, sequentially searches for links from the departure node to the destination node, and traces the node and link with the smallest cost information of the link as a guide route. The shortest route can be guided to the portable navigation terminal. As such a route search method, a method called label determination method or Dijkstra method is used. Patent Document 1 also discloses a route search method using this Dijkstra method.

  Of the routes from the starting point to the destination obtained by route search using the road network data as described above, the route with the minimum total cost (distance or time) of the route is determined as the optimum guide route. Guide route data is created. The guide route data includes map data and guidance data in addition to the data of the optimum route, and the guide route data is read from the guide data storage unit as necessary and displayed on the display unit.

  In general, a guide route and a mark indicating the current position of the navigation device are superimposed on a map of a certain scale and range including the current position of the navigation device measured using the GPS receiver of the navigation device. The current position mark is displayed at the center of the display screen. When the navigation system has a voice guidance function, the guidance data is voice data, and guidance to the user is performed by voice output.

  The map data is divided into a mesh shape within a predetermined latitude range and longitude range, and a map of a specific area is specified by the mesh number. In the communication-type navigation system, nine mesh map data that are adjacent vertically, horizontally, and diagonally are distributed from the server to the terminal device, centering on the mesh map data including the current position of the terminal device. When the terminal device moves and the map data is insufficient, the terminal device requests distribution of the map data of the mesh that is insufficient to the server. In an in-vehicle navigation system, map data of a certain area is stored in advance in a hard disk device or the like.

  When a map is displayed on the display means in such a navigation system, the road and its name are displayed in the vicinity of the corresponding road. For example, the following Patent Document 2 (Japanese Patent Laid-Open No. 2005-115174) discloses a map display device that displays the name of the road along the shape of the road.

  The map display device disclosed in Patent Document 2 includes a map display area determination unit, a road information acquisition unit, a map display data generation unit, and the like. The map display device determines an area for displaying the map, and the road information acquisition unit determines the inflection point coordinate information about the traffic route to be displayed in the determined display area from the map data transmitted from the map data distribution server. Get name information. The map display data generation unit sets the display position at a position along the traffic route for each character or each symbol constituting the character symbol string indicated in the name information and avoiding interference with other character symbols. Determine and generate map display data for displaying characters or symbols at the determined positions.

  9, 10, and 11 are diagrams illustrating specific examples of the map display disclosed in Patent Document 2. FIG. According to this map display device, as shown in FIG. 9, the road name “YASUKUNI DORI” is displayed along the shape of the corresponding road, and when the character font can be rotated like the alphabet, the road shape is inclined. Rotated along the display. At this time, as shown in FIG. 10, when adjacent characters interfere, the display position is adjusted and displayed at a position where interference does not occur.

  If the road name to be displayed is a font that cannot be rotated, such as kanji, the characters are arranged linearly in a certain direction along the road shape without rotating the characters as shown in FIG. it's shown.

JP 2001-165681 A (FIGS. 1 and 2) Japanese Patent Laying-Open No. 2005-115174 (FIGS. 1, 4, 6, 16, and claims 1 to 3)

  However, when a display such as the map display device disclosed in Patent Document 2 is performed, if a road name is displayed by rotating characters, the road name becomes difficult to see depending on the resolution of the character font. For example, FIG. 12 is a diagram illustrating an example in which a road name is displayed along a road shape using a character font that can be rotated like an alphabet, FIG. 12A is the first character, FIG. 12B is the second character, FIG. 12C shows the sixth character, FIG. 12D shows a state in which the positions and rotation angles of all the characters are determined along the road shape, and FIG. 12E shows an example in which the road and road name determined in FIG. 12D are displayed. .

  As can be seen from FIG. 12, when the road is inclined, when the font is rotated and displayed along the shape of the road, when the font resolution is low, the character is difficult to read if the rotation angle is large, and the visibility is high. This causes the problem of lowering.

  In addition, when the road name is displayed using a character font that cannot be rotated and arranged in a certain direction along the slope of the road, the road name is displayed as shown in FIG. 13, but roads such as road Rd1 and road Rd2 are displayed. When the road name A of the road Rd1 is displayed in the vicinity with similar slopes, there may be a problem that it is impossible to identify which road name the road name A is.

  As a result of various studies to solve the above problems, the inventor of the present application extracts the longest road link from the displayed road links, and determines the road name based on the length and the length of the road name. The present invention has been completed by conceiving that the above-mentioned problems can be solved by arranging and displaying in a straight line along the road within the range.

  That is, it is an object of the present invention to provide a map display system, a map display device, and a map display method capable of easily displaying a road name when displaying the road and the road name on the display screen.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is
For each road distinguished by the road ID, expressed by a road link connecting between the road plurality of nodes and node represents the node position information, and the road data representing the road link in the vector data, road name and data, on the basis of the map data including, in the map display system for displaying the road name on the display unit together with the road,
The map display system comprises longest link extraction means, inclination angle extraction means, and road name display adjustment means,
The longest link extraction means extracts the longest road link existing in the display area for one road specified by the road ID to be displayed, and the inclination angle extraction means extracts the inclination angle of the extracted road link. The road name display adjusting means linearly displays the road name of the road using the inclination of the road link in the vicinity of the extracted longest road link.

The invention according to claim 2 of the present application is the map display system according to claim 1,
The road name display adjustment means uses the inclination of the road link in the vicinity of the extracted longest road link to linearly display the road name of the road, and extracts the longest link extracted by the longest link extraction means. The length of the long road link is compared with the length of the road name of the road, and when the length of the road name is longer than the length of the road link, the road name is displayed with a line feed.

The invention according to claim 3 of the present application is the map display system according to claim 1,
The road name display adjustment means uses the inclination of the road link in the vicinity of the extracted longest road link to linearly display the road name of the road, and extracts the longest link extracted by the longest link extraction means. Compare the length of the long road link with the length of the road name of the road. If the length of the road name is longer than the length of the road link, the road name will be within the range of the length of the road link. The font size is adjusted and displayed.

The invention according to claim 4 of the present application is
For each road distinguished by the road ID, expressed by a road link connecting between the road plurality of nodes and node represents the node position information, and the road data representing the road link in the vector data, road name acquires the data, the map data including the map distribution server, the map display device for displaying the road name on the display unit together with the road on the basis of the map data,
The map display terminal device comprises longest link extraction means, inclination angle extraction means, and road name display adjustment means,
The longest link extraction means extracts the longest road link existing in the display area for one road specified by the road ID to be displayed, and the inclination angle extraction means extracts the inclination angle of the extracted road link. The road name display adjusting means linearly displays the road name of the road using the inclination of the road link in the vicinity of the extracted longest road link.

The invention according to claim 5 of the present application is the map display device according to claim 4 ,
The road name display adjustment means uses the inclination of the road link in the vicinity of the extracted longest road link to linearly display the road name of the road, and extracts the longest link extracted by the longest link extraction means. The length of the long road link is compared with the length of the road name of the road, and when the length of the road name is longer than the length of the road link, the road name is displayed with a line feed.

The invention according to claim 6 of the present application is the map display device according to claim 4 ,
The road name display adjustment means uses the inclination of the road link in the vicinity of the extracted longest road link to linearly display the road name of the road, and extracts the longest link extracted by the longest link extraction means. Compare the length of the long road link with the length of the road name of the road. If the length of the road name is longer than the length of the road link, the road name will be within the range of the length of the road link. The font size is adjusted and displayed.

The invention according to claim 7 of the present application is
For each road distinguished by the road ID, expressed by a road link connecting between the road plurality of nodes and node represents the node position information, and the road data representing the road link in the vector data, road name and data, on the basis of the map data including, in the map display method in a map display system for displaying the road name on the display unit together with the road,
The map display system comprises longest link extraction means, inclination angle extraction means, and road name display adjustment means,
The longest link extraction means extracts the longest road link existing in the display area for one road specified by the road ID to be displayed, and the inclination angle of the road link from which the inclination angle extraction means is extracted. And the road name display adjustment means includes a step of linearly displaying the road name of the road using the inclination of the road link in the vicinity of the extracted longest road link. It is characterized by.

The invention according to claim 8 of the present application is the map display method according to claim 7 ,
The step of displaying the road name of the road linearly using the inclination of the road link in the vicinity of the extracted longest road link is extracted by the longest link extraction means. Including the process of comparing the length of the longest road link with the length of the road name of the road, and the process of displaying the road name in a new line when the length of the road name is longer than the length of the road link. Features.

The invention according to claim 9 of the present application is the map display method according to claim 7 ,
The step of displaying the road name of the road linearly using the inclination of the road link in the vicinity of the extracted longest road link is extracted by the longest link extraction means. The process of comparing the length of the longest road link with the length of the road name of the road, and if the length of the road name is longer than the length of the road link, it is within the range of the length of the road link. And a process of adjusting and displaying the font size of the road name.

The invention according to claim 10 of the present application is
For each road distinguished by the road ID, expressed by a road link connecting between the road plurality of nodes and node represents the node position information, and the road data representing the road link in the vector data, road name acquires the data, the map data including the map distribution server, in the map display method in a map display device that displays the road name on the display unit together with the road on the basis of the map data,
The map display terminal device comprises longest link extraction means, inclination angle extraction means, and road name display adjustment means,
The longest link extraction means extracts the longest road link existing in the display area for one road specified by the road ID to be displayed, and the inclination angle of the road link from which the inclination angle extraction means is extracted. And the road name display adjusting means includes a step of linearly displaying the road name of the road using the inclination of the road link in the vicinity of the extracted longest road link. Features.

The invention according to claim 11 of the present application is the map display method according to claim 10 ,
The step of displaying the road name of the road linearly using the inclination of the road link in the vicinity of the extracted longest road link is extracted by the longest link extraction means. Including the process of comparing the length of the longest road link with the length of the road name of the road, and the process of displaying the road name in a new line when the length of the road name is longer than the length of the road link. It is characterized by.

The invention according to claim 12 of the present application is the map display method according to claim 10 ,
The step of displaying the road name of the road linearly using the inclination of the road link in the vicinity of the extracted longest road link is extracted by the longest link extraction means. The process of comparing the length of the longest road link with the length of the road name of the road, and if the length of the road name is longer than the length of the road link, it is within the range of the length of the road link. And a process of adjusting and displaying the font size of the road name.

In the present invention, for each road identified by road ID , the road is represented by a plurality of nodes and road links connecting the nodes, the nodes are represented by position information, and the road links are represented by vector data. and data, on the basis of the map data including a road name data, and the map display system for displaying on the display means the road name along with the road, the longest link extraction means of one identified by the road ID of displaying road The longest road link existing in the display area is extracted, the inclination angle extracting means extracts the inclination angle of the extracted road link, and the road name display adjusting means is in the vicinity of the extracted longest road link. The road name of the road is displayed linearly using the inclination of the road link.
Thus, since the map display system displays the road name linearly along the slope of the road link, the road name can be displayed easily and visually.

In the present invention, when the length of the road name is longer than the length of the road link, the road name is displayed with a line feed, or within the range of the longest road link length, Adjust and display the font size of the road name.
Therefore, even if there are adjacent roads with similar slopes, the road name is displayed linearly within the length range along the longest road link. You will be able to

  Hereinafter, specific examples of the present invention will be described in detail with reference to examples and drawings. However, the embodiment shown below exemplifies a map display device for embodying the technical idea of the present invention, and is not intended to identify the present invention as this map display device. The present invention is equally applicable to the map display devices of other embodiments included in the claims.

  FIG. 1 is a block diagram showing a configuration of a map display system 10 including a map display device 20 according to an embodiment of the present invention. A map display device 20 according to an embodiment of the present invention is connected to a map data distribution server 30 via a network 12 as shown in FIG. 1 and constitutes a communication type map display system 10. The map data distribution server 30 may not only simply distribute map data to the map display device 20, but may also be a route search server having a navigation function.

  Further, the map display device 20 may be a mobile terminal such as an in-vehicle navigation terminal or a mobile phone provided with a navigation application for receiving a navigation service. The map displayed on the map display device 20 includes roads, road names, nodes such as intersections, node names, landmarks on the map and their names, etc., but in this embodiment, the map is representative. Only the road and the road name will be described.

  The map display device 20 includes a control unit 210, a position acquisition unit 220, a communication unit 230, a display area determination unit 241, a road data extraction unit 242, a longest link extraction unit 243, an inclination angle extraction unit 244, and a road name display adjustment unit 245. The road display control unit 240 includes a road data storage memory 250, a distribution request unit 260, a VRAM 270, a display unit 280, an input unit 290, and the like.

  Although not shown, the control unit 210 is a microprocessor having a RAM, a ROM, and a processor, and controls the operation of each unit by a control program stored in the ROM. The communication means 230 is for communicating with various servers such as the map data distribution server 30 via the network 12.

  The input means 290 includes numeric keys, alphabet keys, other function keys, selection keys, scroll keys, and the like, and is used to operate the map display device 20 and to make necessary inputs. Further, a desired menu is selected from a menu screen displayed on the display means 280 as output means, or various input operations are performed by operating keys. Therefore, the display unit 280 also functions as a part of the input unit 290.

  The position acquisition unit 220 includes a satellite navigation unit that receives a GPS satellite signal and measures the current position of the map display device 20 using latitude and longitude. When the map display device 20 is a vehicle-mounted device, the map display device 20 includes autonomous navigation means including an acceleration sensor, a steering angle sensor, and the like, and acquires the current position by the autonomous navigation means in a place where positioning by GPS is impossible.

  The distribution request means 260 is for distributing necessary road data to the map data distribution server 30. When the distribution request means 260 has a navigation function, the route search condition specified by the input means 290 is set to the map information distribution server 30. The map information distribution server 30 searches for a route according to the condition and distributes the guide route and map data to the map display device. The road data storage memory 250 is a storage means for storing road data distributed from the map data distribution server 30. When the road data storage memory 250 has a navigation function, the data on the guide route distributed from the map distribution server 30 and the land on the map are stored. Save data such as marks.

  A VRAM 270 is a memory unit for drawing image data displayed on the display unit 280. The road display control means 240 is a processing unit for displaying roads and road names according to the present invention. Road data, which is a major element of map data, is composed of links that connect nodes with intersections, inflection points, and the like as nodes. FIG. 2 is a diagram showing the structure of road data. As shown in FIG. 2, road IDs are given to roads as identification information, and each road is represented by nodes 1 to N such as intersections and inflection points. The position of each node is expressed by x coordinate and y coordinate using latitude and longitude. For example, the road 1 is represented by a node 1 (x11, y11) to a node N (x1n, y1n).

  As shown in FIG. 3, the link data connecting the nodes of each road generally stores a link cost indicating the link length and required time, and a vector representing the link direction and size for each link. Constitute. For example, the link 1 of the road 1 is a link connecting the node 1 and the node 2, and vector data LV11 indicating the distance between the nodes and the direction and size of the link 1 is stored. The same applies to the other links 2 to N.

  Further, as shown in FIG. 4, the road data and the road name are stored in correspondence with the road ID. The data shown in FIGS. 2 to 4 is accumulated as road data in the road data distribution server 30, and road data in a required range is distributed from the map distribution server 30 in accordance with a distribution request from the map display device 20. The distributed road data is stored in the road data storage memory 250.

  In the present invention, when displaying a map, the display area of the map to be displayed on the display screen of the display means 280 is determined with the current position as the center, and the road to be displayed is extracted from the road data and displayed. For each road, the longest road link is extracted from the road links (referred to as road links) in the display area, and the road name is linear along the road link inclination, that is, on the straight line along the road inclination. Each letter of the road name is arranged and displayed on the screen.

  FIG. 5 is a diagram showing a display example of the roads and road names displayed in this way. As shown in FIG. 5, for the displayed road Rd1, the road name “Central Hill Rd” is displayed linearly in the vicinity of the road link RdL1 along the slope of the longest road link RdL1. Similarly, for the road Rd2, the road name “Fortress Hill Rd” is displayed linearly in the vicinity of the road link RdL1 along the slope of the longest road link RdL2.

  Since the road display control means 240 performs the display control as described above, first, the display area determination means 241 determines the display area of the map displayed on the display screen of the display means 280 with the current position as the center. The data extraction means 242 extracts (reads out) necessary data such as road data and road names to be displayed from the road data storage memory 250 based on the display area determined by the display area determination means 241.

  The longest link extraction unit 243 extracts the longest link of the road with reference to the road data extracted by the road data extraction unit 242, and the inclination angle extraction unit 244 determines the inclination of the longest link extracted by the longest link extraction unit 243. Extract corners. The road name display adjusting means 245 extracts the name of the road and arranges the road name linearly in the vicinity of the longest link along the inclination angle of the longest link. The road data and the road name are drawn in the VRAM 270 and displayed on the display means 280.

  When the road name is displayed linearly along the slope of the longest link and the length of the displayed road name is longer than the length of the longest link (see road Rd1 in FIG. 5), the road name overlaps with the road. It may be difficult to see. In this case, the road name display adjustment means 245 adjusts the position so that the road name is displayed over two lines in a straight line with line breaks at the appropriate position. FIG. 6 shows a display example of roads and road names displayed in this way.

  In FIG. 6, the road name “Central Hill Rd” of the road Rd1 is displayed linearly over two lines (with a line break) along the slope of the longest link RdL1. Further, the road name “Fortress Hill Rd” of the road Rd2 is within the range of the length of the longest link Rd2L1, and thus is displayed linearly in one line without a line break.

  FIG. 6 shows an example in which the road name display adjustment unit 245 displays the road name with line feed. However, when the length of the road name displayed is longer than the length of the longest link, the font size can be reduced. The road name display adjusting means 245 appropriately reduces the font size of the road name so that the road name is within the range of the longest link length, and the longest link along the inclination angle of the longest link. It can also be set as the structure which displays a road name linearly in the vicinity.

  In FIG. 7, the road name “Central Hill Rd” of the road Rd1 is linearly displayed within the range of the longest link length by appropriately reducing the font size along the inclination of the longest link RdL1. Further, the road name “Fortress Hill Rd” of the road Rd2 is within the range of the length of the longest link Rd2L1, and thus is displayed linearly without reducing the font size.

  Next, the above operation procedure will be described with reference to a flowchart. FIG. 8 is a flowchart of a subroutine showing a processing procedure for displaying roads and road names in the map display device 10 according to the embodiment of the present invention. First, in the process of step S11, the display area determining unit 241 determines the display area of the map to be displayed on the display screen of the display unit 280 with the current position as the center. Next, in the process of step S12, the road data extraction means 242 extracts necessary data such as road data and road names to be displayed from the road data storage memory 250 based on the display area determined by the display area determination means 241 ( read out).

  In the process of step S13, the longest link extracting unit 243 extracts the longest link of the road with reference to the road data extracted by the road data extracting unit 242. The inclination angle extracting unit 244 extracts the inclination angle of the longest link extracted by the longest link extracting unit 243 in the process of step S14.

  Next, in the process of step S15, the road name display adjustment means 245 extracts the name of the road and compares the length of the road name (name display length) with the link length of the longest link. When the length of the road name (name display length) is shorter than the link length of the longest link, the road name is linearly arranged near the longest link along the inclination angle of the longest link. In step S17, the road data and the road name are drawn in the VRAM 270.

  On the other hand, when the length of the road name (name display length) is longer than the link length of the longest link in the process of step S15, the process proceeds to the process of step S16, and the road name display adjustment means 245 displays the name display. Make adjustments. The name display adjustment performed here is a process in which the road name is line-breaked so as to be within the range of the length of the longest link as described in FIG. Alternatively, as described with reference to FIG. 7, processing may be performed in which the font size of the road name is appropriately reduced so that the road name can be displayed within the longest road link length.

  When the display adjustment of the road name is performed in the process of step S16, the road data and the road name data are drawn in the VRAM 270 in the process of step S17. Next, in the process of step S18, the road data extraction means 242 determines whether or not the above-described process has been completed for all the extracted roads. If all the processes have not been completed, the process returns to the process of step S12 and the next The above processing is repeated for road data.

  If the above-described processing is completed for all roads in step S18, images such as roads and road names drawn in the VRAM 270 are displayed on the display means 270, and the process returns. When the map display device 20 moves and the screen scrolls, or when the map is insufficient and new map data is downloaded from the map distribution server 30, the above subroutine processing is repeatedly executed.

  As described above, according to the map display device of the present invention, the longest road link is extracted from the road links of the road to be displayed, and the road names are displayed linearly along the inclination of the road link. For this reason, the road name can be displayed easily.

The present invention is applicable to all cases in which map display is performed from vector map data in which road data is represented by vector data. Even if the finally displayed map is a raster map, the present invention can be applied to the drawing of the map.
In addition, the map display device may be a portable information terminal and may be applied when display processing is performed in the device of the mobile terminal, or the map server performs drawing processing and distributes the map display device as a raster map. It can also be applied to cases.

It is a block diagram which shows the structure of the map display system containing the map display apparatus concerning the Example of this invention. It is a figure which shows the structure of the road data which are the main elements of map data. It is a figure which shows the data of the link in the road data of FIG. It is a figure which shows the data of a road name. It is a figure which shows the example of a display of the road displayed on the map display apparatus concerning the Example of this invention, and a road name. It is a figure which shows the other example of the example of a display of the road displayed on the map display apparatus concerning the Example of this invention, and a road name. It is a figure which shows the further another example of the example of a display of the road displayed on the map display apparatus concerning the Example of this invention, and a road name. It is a flowchart which shows the operation | movement procedure which displays a road and a road name in the map display apparatus concerning the Example of this invention. It is a figure which shows an example of the road displayed by the conventional map display, and its road name display. FIG. 10 is a diagram showing a concept of displaying characters while rotating characters in the map and road name display shown in FIG. 9 to avoid interference of the characters. It is a figure which shows the other example of the display of the road displayed by the conventional map display, and its road name, and is a figure which shows the example which displayed the road name by the character font which cannot be rotated like a Chinese character. In the conventional map display, it is a figure which shows the example which displays a road name along a road shape using the character font which can be rotated, FIG. 12A is the 1st character, FIG. 12B is the 2nd character, FIG. FIG. 12D is a diagram showing an example in which the positions and rotation angles of all characters are determined along the road shape, and FIG. 12E is a diagram showing an example in which the roads and road names determined in FIG. 12D are displayed. It is a figure which shows the example arrange | positioned and displayed in the fixed direction along the inclination of a road using the character font which cannot rotate a road name in the conventional map display.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Map display system 12 ... Network 20 ... Map display device 210 ... Control means 220 ... Position acquisition means 230 ... Communication means 240 ... Road display control means 241 ... display area determining means 242 ... road data extracting means 243 ... longest link extracting means 244 ... inclination angle extracting means 245 ... road name display adjusting means 250 ... road data storage memory 260 ..Distribution request means 270 VRAM
280 ... Display means 290 ... Input means

Claims (12)

For each road distinguished by the road ID, expressed by a road link connecting between the road plurality of nodes and node represents the node position information, and the road data representing the road link in the vector data, road name and data, on the basis of the map data including, in the map display system for displaying the road name on the display unit together with the road,
The map display system comprises longest link extraction means, inclination angle extraction means, and road name display adjustment means,
The longest link extraction means extracts the longest road link existing in the display area for one road specified by the road ID to be displayed, and the inclination angle extraction means extracts the inclination angle of the extracted road link. The road name display adjusting means linearly displays the road name of the road using the inclination of the road link in the vicinity of the extracted longest road link.   The road name display adjustment means uses the inclination of the road link in the vicinity of the extracted longest road link to linearly display the road name of the road, and extracts the longest link extracted by the longest link extraction means. The length of the long road link is compared with the length of the road name of the road, and if the length of the road name is longer than the length of the road link, the road name is displayed with a line feed. The map display system described in 1.   The road name display adjustment means uses the inclination of the road link in the vicinity of the extracted longest road link to linearly display the road name of the road, and extracts the longest link extracted by the longest link extraction means. Compare the length of the long road link with the length of the road name of the road. If the length of the road name is longer than the length of the road link, the road name will be within the range of the length of the road link. The map display system according to claim 1, wherein the font size is adjusted and displayed. For each road distinguished by the road ID, expressed by a road link connecting between the road plurality of nodes and node represents the node position information, and road data showing the road link in the vector data, road name acquires the data, the map data including the map distribution server, the map display device for displaying the road name on the display unit together with the road on the basis of the map data,
The map display terminal device comprises longest link extraction means, inclination angle extraction means, and road name display adjustment means,
The longest link extraction means extracts the longest road link existing in the display area for one road specified by the road ID to be displayed, and the inclination angle extraction means extracts the inclination angle of the extracted road link. Then, the road name display adjusting means linearly displays the road name of the road using the inclination of the road link in the vicinity of the extracted longest road link. The road name display adjustment means uses the inclination of the road link in the vicinity of the extracted longest road link to linearly display the road name of the road, and extracts the longest link extracted by the longest link extraction means. comparing the lengths of the road name of the road of a long road link, if the length of the road name is longer than the length of the road link, claim 4, characterized in that on a separate line the road name The map display device described in 1. The road name display adjustment means uses the inclination of the road link in the vicinity of the extracted longest road link to linearly display the road name of the road, and extracts the longest link extracted by the longest link extraction means. Compare the length of the long road link with the length of the road name of the road. If the length of the road name is longer than the length of the road link, the road name will be within the range of the length of the road link. The map display device according to claim 4 , wherein the font size is adjusted and displayed. For each road distinguished by the road ID, expressed by a road link connecting between the road plurality of nodes and node represents the node position information, and the road data representing the road link in the vector data, road name and data, on the basis of the map data including, in the map display method in a map display system for displaying the road name on the display unit together with the road,
The map display system comprises longest link extraction means, inclination angle extraction means, and road name display adjustment means,
The longest link extraction means extracts the longest road link existing in the display area for one road specified by the road ID to be displayed, and the inclination angle of the road link from which the inclination angle extraction means is extracted. And the road name display adjustment means includes a step of linearly displaying the road name of the road using the inclination of the road link in the vicinity of the extracted longest road link. A map display method characterized by the above. The step of displaying the road name of the road linearly using the inclination of the road link in the vicinity of the extracted longest road link is extracted by the longest link extraction means. Including the process of comparing the length of the longest road link with the length of the road name of the road, and the process of displaying the road name in a new line when the length of the road name is longer than the length of the road link. The map display method according to claim 7 , wherein the map display method is characterized. The step of displaying the road name of the road linearly using the inclination of the road link in the vicinity of the extracted longest road link is extracted by the longest link extraction means. The process of comparing the length of the longest road link with the length of the road name of the road, and if the length of the road name is longer than the length of the road link, it is within the range of the length of the road link. The map display method according to claim 7 , further comprising: adjusting and displaying a font size of a road name. For each road distinguished by the road ID, expressed by a road link connecting between the road plurality of nodes and node represents the node position information, and the road data representing the road link in the vector data, road name acquires the data, the map data including the map distribution server, in the map display method in a map display device that displays the road name on the display unit together with the road on the basis of the map data,
The map display terminal device comprises longest link extraction means, inclination angle extraction means, and road name display adjustment means,
The longest link extraction means extracts the longest road link existing in the display area for one road to be displayed specified by the road ID, and the inclination angle of the road link from which the inclination angle extraction means is extracted. And the road name display adjusting means includes a step of linearly displaying the road name of the road using the inclination of the road link in the vicinity of the extracted longest road link. A featured map display method. The step of displaying the road name of the road linearly using the inclination of the road link in the vicinity of the extracted longest road link is extracted by the longest link extraction means. Including the process of comparing the length of the longest road link with the length of the road name of the road, and the process of displaying the road name in a new line when the length of the road name is longer than the length of the road link. The map display method according to claim 10 . The step of displaying the road name of the road linearly using the inclination of the road link in the vicinity of the extracted longest road link is extracted by the longest link extraction means. The process of comparing the length of the longest road link with the length of the road name of the road, and if the length of the road name is longer than the length of the road link, it is within the range of the length of the road link. The map display method according to claim 10 , further comprising: adjusting and displaying a font size of a road name.

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