JP2009074805A - Map display system, map display device, and map display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To issue an alarm when scroll operation is performed by which a guide route is deviated from a display screen, and to properly cope with a situation that the scroll operation is still continued. <P>SOLUTION: In this map display system 10 having a map scroll function for scrolling a map image displayed by a scroll operation means (scroll key 281), a display means 27 has a guide route display determination domain having a fixed width at the periphery of a display domain, and a map display system 10 is equipped with a guide route display determination means 291 and a scroll control means 29. When a map image displayed on the display means 27 is scrolled by the scroll operation means (scroll key 281), the guide route display determination means 291 determines that scroll operation by which an image of the guide route is deviated from the display screen is performed, when the image of the guide route is displayed in only the guide route display determination domain, and the scroll control means 29 outputs an alarm of an effect that the image of the guide route is deviated from the display screen. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a map display system, a map display device, and a map display method for displaying a map image in a route search system and the like, and in particular, when displaying a guide route and receiving route guidance, A map display system, a map display device, and a map display device that notify a warning to that effect when a scroll operation is performed to deviate from the guide route, and appropriately control the scroll display of the map when the scroll operation is continued It relates to a map display method.

  2. Description of the Related Art Conventionally, navigation devices and navigation systems that guide a user by searching for a route from a desired departure point to a destination using map data and road data are known. Such navigation devices and navigation systems are known. As a car navigation device that is installed in an automobile and guides the route to the driver, a communication type that uses a mobile phone as a navigation terminal to send a route search request to the route search server, receives the result, and receives route guidance Navigation systems have been put to practical use.

  In particular, the communication-type navigation system is a system that uses a mobile terminal such as a mobile phone as a navigation terminal, and is also used as a navigation system for pedestrians. As a navigation system for pedestrians, it is preferable to add a route guidance function including transportation, and in addition to searching and guidance for walking routes, the route search server accumulates routes and operation time data of transportation, There is also a navigation system having a function of guiding a route from a desired departure station to a desired destination station (boarding candidate train) in addition to searching for a walking route and guidance. There is also a traffic guidance system that receives and displays information such as routes, timetables of transportation facilities, and trains that can be boarded from an information distribution server without searching for walking routes.

  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 on a departure point and a destination from a portable navigation terminal to an information distribution server, and the information distribution server searches and guides a route that matches a search condition from road network and traffic network data. 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 information distribution server has roads (routes) of map data as nodes and nodes as the positions of inflection points, links connecting the nodes as links, and cost information (distance and required time) of all links as a database. ing. Then, the information distribution server sequentially searches for a link from the departure node to the destination node with reference to the database, 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.

  In providing information on stores and events, a user operates a mobile terminal to input a store or event category and an area to be searched for a search request. The server searches for stores and events that fall into the specified category and exist in the area, and the information is distributed to the map display terminal. In providing the timetable, when the user operates the mobile terminal to designate a route, the timetable of the route is presented on the screen of the display device of the mobile terminal. Further, in the transfer guidance, the recommended route is presented by the user specifying the departure place and the destination.

  In addition, connect to a map server on the Internet from a terminal device such as a personal computer or a mobile phone, and enter the desired location, facility, store address, name, telephone number, etc. to determine the location of the location, facility, or store. It is also possible to display a map image on a display device by downloading map data within a predetermined range.

  In a communication navigation system, map data for displaying a map image is generally composed of vector map data instead of bitmap data (raster map data) in order to suppress the amount of data during communication. The vector map data includes polygon data for displaying roads included in a map in mesh units in a state close to natural terrain, and road data expressing each road link as a vector. Road data expressed in vectors is used when drawing a guide route or route history on a map image. The current position of the map display device is drawn on the searched route and road data at the time of route guidance. The current position is calculated by satellite navigation using a GPS receiver provided in the map display device.

  A communication-type navigation system using a mobile phone as a terminal device is mainly used for route guidance for pedestrians who move on foot or using transportation, but pedestrians do not always move on foot, and taxis. It is preferable that a comprehensive route search including a section in which the vehicle moves can be performed using the road network data for the vehicle. In addition, it is more preferable that the passenger who gets on the passenger seat can use the mobile phone and transmit the guidance route received from the server to the driver.

  In general, the map image displayed on the display device is a map image of an area of a predetermined size centered on the current position of the terminal device. Various scales of the map are prepared from a wide area map to a city map, and a map image of a scale selected by the user is displayed. When the user wants to display a map image including a portion not included in the displayed map image, the image can be scrolled using a scroll operation unit such as a scroll key provided in the operation input means.

  In general, as a scroll operation means in a map display device, a cross key or a joystick is used, and by operating this, the vertical, horizontal and diagonal directions of the display screen are specified, and scrolling is performed according to the operation amount (operation duration). You will be asked to specify the amount.

  There are several ways to scroll the map. One method is to scroll the map image in the desired direction from its current position regardless of the direction of the guidance route by navigation. Also, according to such a map scrolling method, the location of the desired POI is simply used. It is also possible to check a nearby transportation station by scrolling a map image displayed by designating a point in a desired direction.

  On the other hand, there is also a method of scrolling the map image along the direction of the route that is in progress when the guide route is being advanced using the navigation system. For example, the following Patent Document 2 (Japanese Patent Laid-Open No. 8-128204) discloses an invention of such a map display device. The map display device includes, for example, a scroll key for specifying that the map display is displayed and scrolled linearly in each of vertical, horizontal, and diagonal directions. Based on the operation of the scroll key, the map display device The map image is scroll-displayed along the direction. According to this map display device, even if the road is tortuous when checking the road to be traveled on the guide route, the map image is scrolled and displayed along the traveling direction of the road. Operations can be performed smoothly.

  By the way, when a map image is scrolled, depending on the direction of scrolling and the amount of scrolling operation, the guidance route, current position mark, POI icon image, etc. that were noticed before school may be off the display screen. As an invention for improving such problems, for example, the invention of a navigation device is disclosed in the following Patent Document 3 (Japanese Patent Laid-Open No. 2000-266554).

  In the navigation device disclosed in Patent Document 3, when a scroll operation by the scroll monitoring unit is detected, the scroll execution unit starts scrolling the map. Subsequently, the display monitoring unit determines whether or not the vehicle is off the display screen by a scroll operation. When the vehicle position is off the display screen by the scroll operation, the control unit automatically displays a map display. It is configured to switch to a multiple display mode in which a map display including a position and a scroll map display are performed.

JP 2001-165681 A JP-A-8-128204 JP 2000-266554 A

  As described above, when a map image is scrolled, depending on the direction of scrolling and the amount of scrolling operation, the guidance route, current position mark, POI icon image, etc. that were noticed before school may be off the display screen. is there. When the displayed map image is in this state, the operator's eyes cannot catch up with the scrolling speed, and the current position is lost, or not only the current position is lost, but the sense of direction is distorted, etc. Inconvenience occurs.

  The navigation device disclosed in Patent Document 3 displays a map display by the control unit when the vehicle position deviates from the display screen by a scroll operation, and automatically displays a map display including the vehicle position and a scroll map display. By switching to the multiple display mode to be performed, the above-described problems are avoided. However, the navigation device disclosed in Patent Document 3 has a problem in that the display control unit must be compatible with the multiple display mode, and the configuration and control become complicated.

  In addition, the map display device disclosed in Patent Document 2 can scroll the map image following the guide route when traveling on the guide route. There is a problem that a means for scrolling and displaying the map image along the traveling direction of the road is required, such as providing a scroll key for designating display scrolling linearly in each direction.

  The inventor of the present application has conducted various studies to solve the above problems, and as a result, when a guidance operation is displayed and route guidance is received, when a scroll operation is performed to remove the guidance route from the display screen, The present invention is completed by conceiving that the above problem can be solved if a warning to that effect is notified and the scroll display of the map is appropriately controlled when the scroll operation is continued. Has been reached.

  For example, when an inappropriate scroll operation is warned and the scroll operation is continued, the scroll operation is invalidated, or the map data for scrolling is extracted from polygon data, and if the scroll operation is continued, the natural feature If only the map image is scroll-displayed, the user can easily recognize that there has been an inappropriate scroll operation.

  That is, according to the present invention, when a guidance operation is displayed and a route guidance is received, if a scroll operation is performed to disengage the guidance route from the display screen, a warning to that effect is given, and the scroll operation is continued. It is an object of the present invention to provide a map display system, a map display device, and a map display method that appropriately control the scroll display of a map when it is performed.

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is
A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display system having a map scroll function for displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means has a guide route display determination area having a constant width at the periphery of the display area, and the map display system includes a guide route display determination means and a scroll control means,
When the map image displayed on the display unit is scrolled by the scroll operation unit, the guide route display determination unit displays the guide route image when the guide route image is displayed only in the guide route display determination region. The scroll control means outputs a warning that the image of the guide route is out of the display screen.

  The invention according to claim 2 of the present application is the map display system according to claim 1, wherein the guide route display determination means is a guide route image indicating a guide route displayed in the guide route display determination region or on a guide route. Based on the number of nodes, it is determined whether or not a scroll operation has been performed in which the image of the guide route deviates from the display screen.

  The invention according to claim 3 of the present application is the map display system according to claim 1 or claim 2, wherein the guide route display determining means determines that a scroll operation is performed in which the image of the guide route is removed from the display screen, After the scroll control means outputs a warning that the image of the guide route is off the display screen, when the scroll operation by the scroll operation means is further continued, the scroll control means performs the scroll operation by the scroll operation means. It is characterized by being invalidated.

The invention according to claim 4 of the present application is the map display system according to claim 1 or 2, wherein the map display system extracts polygon data indicating natural features from the map data and uses it as scroll map data. Equipped with scroll map data extraction means,
After the guide route display determining means determines that a scroll operation has been performed in which the image of the guide route deviates from the display screen, the scroll control means outputs a warning that the image of the guide route deviates from the display screen, and then further When the scroll operation by the scroll operation means is continued, the scroll control means scroll-displays the map image on the display means using the scroll map data.

The invention according to claim 5 of the present application is
A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display system having a map scroll function for displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means uses a display area as a guidance route display determination area, and the map display system includes a guidance route display determination means and a scroll control means,
When the map image displayed on the display unit is scrolled by the scroll operation unit, the guide route display determination unit is based on the number of nodes on the guide route indicating the guide route displayed in the guide route display determination region. And determining whether or not a scroll operation has been performed in which the image of the guide route deviates from the display screen, and the scroll control means outputs a warning that the image of the guide route deviates from the display screen. .

  The invention according to claim 6 of the present application is the map display system according to claim 2 or 5, wherein the guide route display determination means is a link on the guide route displayed in the display region or the guide route display determination region. If only one of the nodes at the end point of the link is displayed, the nodal point or inflection point of the link is set as a virtual node, and the guide route image is based on the number of nodes including the virtual node. It is characterized in that it is determined whether or not a scroll operation has been performed to deviate from the display screen.

The invention according to claim 7 of the present application is
A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display device having a map scroll function for displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means has a guide route display determination area having a constant width at the periphery of the display area, and the map display system includes a guide route display determination means and a scroll control means,
When the map image displayed on the display unit is scrolled by the scroll operation unit, the guide route display determination unit displays the guide route image when the guide route image is displayed only in the guide route display determination region. The scroll control means outputs a warning that the image of the guide route is out of the display screen.

  The invention according to claim 8 of the present application is the map display device according to claim 7, wherein the guide route display determination means is a guide route image indicating a guide route displayed in the guide route display determination area or on a guide route. Based on the number of nodes, it is determined whether or not a scroll operation has been performed in which the image of the guide route deviates from the display screen.

  In the invention according to claim 9 of the present application, in the map display device according to claim 7 or claim 8, the guide route display determination means determines that a scroll operation is performed in which the image of the guide route deviates from the display screen, After the scroll control means outputs a warning that the image of the guide route is off the display screen, when the scroll operation by the scroll operation means is further continued, the scroll control means performs the scroll operation by the scroll operation means. It is characterized by being invalidated.

The invention according to claim 10 of the present application is the map display device according to claim 7 or claim 8, wherein the map display device extracts polygon data indicating a natural feature from the map data and generates the map data for scrolling. Equipped with scroll map data extraction means,
After the guide route display determining means determines that a scroll operation has been performed in which the image of the guide route deviates from the display screen, the scroll control means outputs a warning that the image of the guide route deviates from the display screen, and then further When the scroll operation by the scroll operation means is continued, the scroll control means scroll-displays the map image on the display means using the scroll map data.

The invention according to claim 11 of the present application is
A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display device having a map scroll function for displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means uses a display area as a guidance route display determination area, and the map display system includes a guidance route display determination means and a scroll control means,
When the map image displayed on the display unit is scrolled by the scroll operation unit, the guide route display determination unit is based on the number of nodes on the guide route indicating the guide route displayed in the guide route display determination region. And determining whether or not a scroll operation has been performed in which the image of the guide route deviates from the display screen, and the scroll control means outputs a warning that the image of the guide route deviates from the display screen. .

  The invention according to claim 12 of the present application is the map display device according to claim 8 or claim 11, wherein the guide route display determination means is a link on the guide route displayed in the display area or the guide route display determination area. If only one of the nodes at the end point of the link is displayed, the nodal point or inflection point of the link is set as a virtual node, and the guide route image is based on the number of nodes including the virtual node. It is characterized in that it is determined whether or not a scroll operation has been performed to deviate from the display screen.

The invention according to claim 13 of the present application is
A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display method in a map display system having a map scroll function for displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means has a guide route display determination area having a constant width at the periphery of the display area, and the map display system includes a guide route display determination means and a scroll control means,
When the map image displayed on the display means is scrolled by the scroll operation means, the guide route display determination means displays the guide route image when the guide route image is displayed only in the guide route display determination area. A determination step for determining that a scroll operation that deviates from the display screen has been performed, and a warning step for outputting a warning that the image of the guide route deviates from the display screen.

  The invention according to claim 14 of the present application is the map display method according to claim 13, wherein the determination step is based on a guide route image indicating a guide route displayed in the guide route display determination region or the number of nodes on the guide route. On the basis of this, it includes a process of determining whether or not a scroll operation has been performed in which the image of the guide route deviates from the display screen.

  The invention according to claim 15 of the present application is the map display method according to claim 13 or claim 14, wherein the map display method further comprises: The scroll control means includes a step of invalidating the scroll operation by the scroll operation means.

The invention according to claim 16 of the present application is the map display method according to claim 13 or claim 14, wherein the map display system extracts polygon data indicating natural features from the map data and generates the map data for scrolling. Equipped with scroll map data extraction means,
When the scroll operation by the scroll operation means is further continued after the warning step, the scroll control means has a step of scrolling and displaying a map image on the display means using the scroll map data. To do.

The invention according to claim 17 of the present application is
A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display method having a map scroll function of displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means uses a display area as a guidance route display determination area, and the map display system includes a guidance route display determination means and a scroll control means,
When the map image displayed on the display means is scrolled by the scroll operation means, the guide route display determination means is based on the number of nodes on the guide route indicating the guide route displayed in the guide route display determination area. A determination step for determining whether or not a scroll operation has been performed in which the image of the guide route deviates from the display screen; and a warning step in which the scroll control means outputs a warning that the image of the guide route deviates from the display screen; It is characterized by having.

  The invention according to claim 18 of the present application is the map display method according to claim 14 or claim 17, wherein the determination step includes one link on the guide route displayed in the display region or the guide route display determination region. If only one of the nodes at the end point of the link is displayed, the nodal point or inflection point of the link is set as a virtual node, and an image of the guide route is displayed on the display screen based on the number of nodes including the virtual node. Including a process of determining whether or not a scroll operation deviating from the above has been performed.

  In the invention according to claim 1, the display means has a guide route display determination area having a certain width at the peripheral edge of the display area, and the map display system includes a guide route display determination means and a scroll control means. When the map image displayed on the display means is scrolled by the scroll operation means, the guidance route display determination means displays the guidance route image when the guidance route image is displayed only in the guidance route display determination area. The scroll control means determines that a scroll operation deviating from the above has been performed, and the scroll control means outputs a warning to the effect that the guide route image deviates from the display screen.

  According to such a configuration, when a scroll operation in which the guide route deviates from the display screen is detected by the user, a warning is output, so that the user can immediately interrupt such a scroll operation. As a result, the user loses sight of the guidance route and the troublesome operation for returning to the original screen becomes unnecessary. Moreover, it is not misunderstood as an error of the map display device.

  In the invention according to claim 2, in the map display system according to claim 1, the guide route display determination means includes a guide route image indicating the guide route displayed in the guide route display determination region or the number of nodes on the guide route. Based on the above, it is determined whether or not a scroll operation has been performed in which the image of the guidance route is off the display screen.

  According to such a configuration, it is possible to easily determine that a scroll operation has been performed in which the guide route deviates from the display screen.

  In the invention according to claim 3, in the map display system according to claim 1 or claim 2, the guide route display determining means determines that a scroll operation is performed in which the image of the guide route is off the display screen, and scroll control is performed. After the means outputs a warning that the image of the guide route is off the display screen, if the scroll operation by the scroll operation means is further continued, the scroll control means invalidates the scroll operation by the scroll operation means.

  According to such a configuration, even if the user does not notice the warning and continues the scrolling operation, the scrolling operation is invalidated, so that the guidance route does not deviate from the display screen and the user is guided. The troublesome operation for losing the route and returning to the original screen becomes unnecessary. Moreover, it is not misunderstood as an error of the map display device.

  According to a fourth aspect of the present invention, in the map display system according to the first or second aspect, the map display system extracts the polygon data indicating the natural feature from the map data and uses it as the scroll map data. Map data extraction means, the guidance route display determination means determines that a scroll operation has been performed in which the image of the guidance route deviates from the display screen, and the scroll control means issues a warning that the image of the guidance route deviates from the display screen. When the scroll operation by the scroll operation unit is continued after the output, the scroll control unit scrolls the map image on the display unit using the scroll map data.

  According to such a configuration, when the scrolling process in which the guide route deviates from the display screen is continued, the map image is scrolled and displayed by switching from the normal map data to the map data for scrolling based on the polygon of the natural feature. The user can easily recognize that the guidance route has deviated from the display screen from the difference in the map images, and the user is not misunderstood such as an error of the display device.

In the invention according to claim 5, the display means uses the display area as a guide route display determination area, and the map display system includes a guide route display determination means and a scroll control means,
When the map image displayed on the display means is scrolled by the scroll operation means, the guide route display determination means determines the guide route based on the number of nodes on the guide route indicating the guide route displayed in the guide route display determination area. It is determined whether or not a scroll operation has been performed so that the image of the guide route deviates from the display screen, and the scroll control means outputs a warning that the image of the guide route deviates from the display screen.

  According to such a configuration, when a scroll operation in which the guide route deviates from the display screen is detected by the user, a warning is output, so that the user can immediately interrupt such a scroll operation. As a result, the user loses sight of the guidance route and the troublesome operation for returning to the original screen becomes unnecessary. Moreover, it is not misunderstood as an error of the map display device.

  In the invention according to claim 6 of the present application, in the map display system according to claim 2 or claim 5, the guide route display determining means has one link on the guide route displayed in the display area, When only one of the nodes at the end point of the link is displayed, a scroll operation in which the image of the guide route deviates from the display screen based on the number of nodes including the virtual node with the node of the link or the bending point as a virtual node It is determined whether or not.

  According to such a configuration, even if the link indicating the guide route displayed in the display area or the guide route display determination area is long and the node of the link end point is not displayed in the display area, the link of the guide route is determined. Thus, it is possible to determine whether or not a scroll operation has been performed in which the image of the guide route deviates from the display screen.

  In the inventions according to claims 7 to 12, it is possible to provide a map display device constituting the map display system according to claims 1 to 6, respectively. In this invention, the map display method in the map display system according to claims 1 to 6 can be provided.

  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 system for embodying the technical idea of the present invention, and is not intended to identify the present invention as this map display system. The present invention is equally applicable to the map display systems of other embodiments included in the scope of claims.

  FIG. 1 is a system configuration diagram showing a configuration of a map display system 10 according to an embodiment of the present invention. As shown in FIG. 1, the map display system 10 includes a map display device 20 and a route search server 30 connected via a network 12. The map display system 10 includes a POI information distribution server 50 that provides detailed information such as the location of POIs (Points of Interest: places of interest) belonging to various categories, service contents, advertisements, map data, traffic route data, and operation times. It is configured with various information distribution servers 51 that provide table data, contents such as music and various images, and other information.

  The route search server 30 can acquire necessary data from the POI information distribution server 50 or other information distribution server 51 via the network 12 and add it to its own database. Similarly, a search request can be transmitted to the POI information distribution server 50 or another information distribution server 51 to obtain a desired search result.

  The map display system 10 according to the present invention is not limited to the above-described configuration, and the route search server 30 may have a function of a map distribution server that distributes a map of a POI location together with a navigation service function. The map display device 20 can also use a mobile phone, and may be a portable device such as a PDA, music player, portable game machine, or personal computer (PC). Further, it may be a stand-alone type navigation device.

  The route search server 30 shown in FIG. 1 includes a map database 34 and a route search network database 35. When a route search request is received from the map display device 20, the route search server 30 searches for a route with reference to the route search network database 35. And it has the general navigation function which transmits the guidance route (recommended route) obtained from the result of the route search to the map display device 20. The route search server 30 also includes a POI information database 36 that stores POI information such as the POI location, telephone number, address, and business hours.

  When there is a request for acquiring map data by designating a desired point or POI from the map display device 20, the route search server 30 reads out the corresponding map data by referring to the map database 34 and distributes it to the map display device 20. . When the map display device 20 requests a route search to the route search server 30 and receives a route guidance service, the map display device 20 sets a desired departure place and destination as described above, and the route search server 30 A route search request is sent to. If there is a stopover point between the departure point and the destination point, the stopover point is also set.

  To set these points, display the route search condition input screen as described above, enter the name, address (location) and phone number of the point, display the map on the display screen, A method of selecting a desired point by selecting the cursor is used. The starting point, waypoint, and destination are generally set as the location of a specific facility or location of interest (POI), but the link or node on the road closest to the facility or POI. The position may be used as the facility or POI location on the route search.

  In the map display system 10 of the present embodiment, in addition to a method for displaying a route search condition input screen and inputting a point, a desired area is designated, or a POI search is performed to select a POI of interest, and the POI is located. It is possible to display a map of the area, specify a desired point on the displayed map, and specify a starting point, a destination, and a waypoint.

  When there is a route search request from the map display device 20, the route search server 30 searches the optimum route (guide route) from the designated departure point to the destination with reference to the route search network database 35, and the map database 34. The guide route data is transmitted to the map display device 20 together with the map data read out from. In the route search, a plurality of candidate routes are searched and presented according to conditions such as cumulative distance, required time, number of transfers, fare, etc., and the route selected by the user is selected as a guide route to the map display device 20. There is also an aspect to do.

  When the map display device 20 receives the map data and the guidance route data from the route search server 30, the map display device 20 displays a map image centered on the current position of the map display device 20 on the display screen. On the map image, a current position mark indicating the current position of the map display device 20 and a guide route image indicating the guide route are superimposed and displayed.

  FIG. 3 is a conceptual diagram for explaining a process for determining whether or not the guide route deviates from the display screen by a scroll operation. In the present embodiment, on the display screen of the display means, as shown in FIG. 3, a guide route display determination region B having a certain width is set at the periphery of the display region A, and the guide route is displayed only in this region. In other areas, it is detected that the guide route is not displayed at all. In the present specification, the case where the display of the guidance route is in such a display state by the scroll operation is referred to as “the guidance route is off the display screen”.

  When a scroll operation in which the guide route deviates from the display screen is detected, the map display device 20 outputs a warning to that effect by voice or display. If the scroll operation as described above is continued even after the warning is output, the scroll operation is invalidated, or the map data being scrolled is displayed by switching from the normal map data to the map data for scrolling. The scroll map data is polygon data indicating natural features such as mountains, rivers, coastlines, etc., and only natural feature polygon data can be extracted from the map data and stored as scroll map data in advance.

  If the map display system and the map display device are configured in this way, a warning is output when the user detects a scroll operation in which the guide route deviates from the display screen, so the user immediately interrupts the scroll operation. Will be able to.

  In addition, when such a scroll operation is continued without the user being aware of the warning, if the scroll operation is disabled, the guide route is not deviated from the display screen and the user is displayed. There is no need to go back to the state. Or, when the scroll operation is continued, the map data being scrolled is displayed by switching from the normal map data to the map data for scrolling based on the polygon of the natural feature, so that the user can display the guide route. It can be easily recognized from the difference in the map image that the screen is off, and the user is not misunderstood such as an error of the display device.

  Hereinafter, a map display system 10 according to an embodiment of the present invention will be described based on specific examples, but before that, a detailed configuration of the map display system 10 according to the present invention will be described. FIG. 2 is a block diagram showing a detailed configuration of the map display system 10 of FIG.

  The route search server 30 includes a control unit 301, a communication unit 31, a route search unit 32, a map database 34, a route search network database 35, a POI information database 36, a distribution request storage unit 37, and a distribution data editing unit 38. Has been.

  On the other hand, the map display device 20 is a terminal capable of receiving a navigation service, and includes control means 201, communication means 21, GPS reception means 22, scroll map data extraction means 23, map data request means 24, map data storage means. 25, a guide data storage means 26, a display means 27, an operation input means 28 having a scroll key 281, a scroll control means 29, and a guide route display determination means 291.

  When there is a route search, POI search or map distribution request from the map display device 20, the route search server 30 primarily stores it in the distribution request storage means 37. When the request is a route search request, the route search means 32 searches the optimum route or recommended route (guide route) with reference to the route search network database 35. The searched route information is edited by the distribution data editing means 38 and distributed to the map display device 20. Further, map data including the guide route is read from the map database 34 and distributed to the map display device 20.

  If the request from the map display device 20 is a POI search, the route search server 30 searches the POI information database 36 based on the specified condition, searches for the corresponding POI, and distributes it to the map display device 20. When a specific POI is specified and map data is requested, the route search server 30 reads out map data including the location of the corresponding POI from the map database 34 and distributes the map data to the map display device 20.

  In the route search server 30, the control unit 301 is a microprocessor having a RAM, a ROM, and a processor (not shown), and controls the operation of each unit by a control program stored in the ROM. The communication unit 31 is a communication interface for transmitting and receiving communication data with the mobile terminal device 20 and the like via the network 12.

  On the other hand, in the map display device 20, the control means 201 is a microprocessor having a RAM, a ROM, and a processor (not shown), and controls the operation of each unit by a control program stored in the ROM. The communication means 21 is a communication interface for transmitting and receiving communication data with the route search server 30 and the like via the network 12.

  The GPS receiving means 22 receives a signal from a GPS satellite and calculates the current position by latitude and longitude. The operation input means 28 comprises keys, dials, and the like, performs input for operating the map display device 20, and is also used as an input function for route search conditions such as a departure place and a destination. The operation input means 28 includes a scroll key 281 such as a cross key. The display means 27 is composed of a liquid crystal display panel or the like, and is used for displaying a guidance route or a map distributed (transmitted) from the route search server 30. The display means 27 also functions as an input means for operating the map display device 20 by displaying a menu screen and selecting a desired item from the menu screen using the operation input means 28.

  When the map display device 20 requests a route search to the route search server 30, the operation input means 28 is operated, or the menu screen displayed on the display means 27 is operated to obtain a desired departure place, destination, and waypoint. And other route search conditions (time condition, number of searched routes, etc.) are set, and a route search is requested. Further, when searching for a desired POI or requesting a map by designating a specific point or POI, the map data requesting unit 24 uses the specific point or POI data (position information, address, etc.). A map request is transmitted to the route search server 30.

  The map data distributed from the route search server 30 to the map display device 20 is temporarily stored in the map data storage means 25, and the guide route data is temporarily stored in the guidance data storage means 26. Map data and guidance route data stored in the map data storage means 25 and the guidance data storage means 26 are read out as necessary, and a map image and a guidance route are displayed on the display means 27. At that time, a map image of a predetermined range is displayed around the current position of the map display device 20, and the current position mark and the image of the guide route are superimposed and displayed.

  Further, the operation input means 28 includes a scroll key 281, and the map image displayed on the display screen of the display means 27 is scrolled by operating the scroll key 281 to move the scroll cursor in an arbitrary direction. Can do. When the scroll key 281 is operated, the scroll control unit 29 scrolls the map image displayed on the display unit 27 according to the operation direction and the operation amount of the scroll key 281.

  Further, the guide route display determination unit 291 examines an image displayed in the guide route display determination region B described with reference to FIG. 3, and determines whether or not the guide route is off the display screen by a scroll operation. In this determination, when the guide route image displayed on the display screen is displayed only within the guide route display determination area B, it is determined that the scroll operation is such that the guide route is removed from the display screen. Alternatively, when only two nodes are displayed in at least the guidance route display determination region B, it is determined that the guidance route is a scroll operation that deviates from the display screen (in the guidance route display determination region B region). If there are two displayed nodes, one link is displayed, so the position of the guide route can be determined).

  When the guide route display determination unit 291 detects a scroll operation in which the guide route deviates from the display screen by the determination method as described above, the map display device 20 outputs a warning to that effect by voice or display. If the scroll operation as described above is continued after outputting the warning, the scroll control means 29 invalidates the scroll operation by the cursor key 281. Since the user knows that the guidance route is a scroll operation that deviates from the display screen when the warning is output, such a scroll operation can be stopped.

  Also, if such a scrolling operation is continued without the user being aware of the warning, the scrolling operation is invalidated, so that the guide route is not deviated from the display screen, and the user is displayed with the guide route. There is no need to return to the default state.

  When a scroll operation in which the guide route deviates from the display screen is detected, the scroll control means 29 may scroll the map image using scroll map data different from the normal map data. Therefore, the scroll map data extraction unit 23 extracts the scroll map data from the map data transmitted from the route search server 30.

  The map data for scrolling is obtained by extracting only polygon data of natural features such as rivers, mountains, coastlines, and parks as natural feature data for scrolling, excluding road data from the map data. When a scroll operation is performed in such a direction that the guide route can no longer be displayed on the display screen or the movement amount, the scroll control means 29 switches from the normal map data to the natural feature data for scrolling, and the display means 27 displays only the natural feature. Scroll the map image.

  Therefore, when such a scrolling operation is continued without the user being aware of the warning, the map data being scrolled is switched from normal map data to scrolling map data based on natural feature polygons. Since the information is displayed, the user can easily recognize that the guidance route has deviated from the display screen from the difference in the map image, and the user is not misunderstood such as an error of the display device. .

  FIG. 4 is a diagram illustrating an appearance of a mobile phone used as the map display device 20. As shown in FIG. 4, a map image is displayed on the display means 27 of the map display device 20, and a current position mark 42 is displayed on the map image. The operation input means 28 is provided with a scroll key 281. The map scroll mode in the map display device 20 is, for example, manual scroll by default.

  In the manual scroll mode, the user operates the scroll key 281 up, down, left, and right to scroll the map image in a desired direction. When the scroll key 281 is operated, the cursor 41 moves according to the operation amount of the scroll key 281 and the map image is scrolled. The cursor 41 and the current position mark 42 are displayed with a straight line. When the scroll key 281 is operated, the scroll control unit 29 scrolls the map image displayed on the display unit 27 in accordance with the operation of the scroll key 281.

  FIG. 5 is a diagram showing an example of a map image displayed on the display means 27 during route guidance. When the map display device 20 receives the guidance route data together with the map data from the route search server 30, and displays the map data including the guidance route on the display means 27 to receive the route guidance, the display is performed as shown in FIG. A map image 401 is displayed over the entire area (display screen).

  In the map image, the guide route 402 is displayed in a display mode different from other roads (in FIG. 5, a thick line), and icons 403 indicating POIs of restaurants, coffee shops, etc. located at each point are displayed. By displaying such a map image, it is possible to inform the user of the guide route, the roads in the entire periphery, and the location of the POI. When the scroll key 281 is operated up, down, left and right, the map image is scrolled according to the operation direction and the operation amount.

  Here, the map image to be scroll-displayed may be a map image as shown in FIG. 5 displayed on the normal display means 27. However, the map display device 20 displays the guidance route on the display means 27 and receives the route guidance. In the case of the map data for scrolling, as the map data for scrolling, the links within the predetermined range among the nodes and links constituting the guide route and the links (roads) connected to the nodes, the POI data on the guide route, As data obtained by extracting only POI data within a predetermined distance range from the guide route, the data amount at the time of scrolling may be reduced, and the processing load in scroll control may be reduced.

  FIG. 6 is a diagram showing an example in which the scroll map data with the map data reduced in this way is scroll-displayed on the display means 27. As shown in FIG. 6, the map image 405 displayed on the display screen includes a guide route 402 and a first link 406 connected to a node on the guide route (when a predetermined range of links is the first). Then, only the icon 403 indicating the POI located on the guide route or within a predetermined distance range from the guide route and the first link 406 is scroll-displayed.

  Thus, by extracting a certain range of data from the map data as scrolling data and scrolling the map, the load of the scrolling process can be reduced. The user is moving along the guide route, and it is sufficient that a minimum map including at least the guide route is displayed even during scrolling, and the movement is not hindered.

  When the map scrolling operation is completed, the entire map is displayed again based on the original map data as shown in FIG. As a result, the user of the map display device 20 scrolls the map to an arbitrary point at a high speed, and when the scrolling is stopped, the map image 401 without omission is displayed and can be observed.

  FIG. 7 is a diagram showing a guide route display determination area set at the peripheral edge of the display area. On the periphery of the display area A of the display means 27, a guide route display determination area B having a certain width is set. The guide route display determination unit 291 examines data displayed in the guide route display determination region B, and determines whether or not the guide route field image is off the display screen by a scroll operation.

  FIG. 8 is a schematic diagram for explaining a specific example of processing for determining whether or not the guide route is off the display screen when the map image shown in FIG. 7 is scrolled. As described with reference to FIG. 7, a guide route display determination region B having a certain width is set in the peripheral portion of the display region A of the display unit 27. The guide route display determination means 291 checks the data displayed in the guide route display determination area B, and detects the state where the guide route image 402 is displayed only in the guide route display determination area B as shown in FIG. It is determined that there is a high possibility that the guide route is off the display screen.

  In this way, when the guide route display determination unit 291 determines that the image of the guide route is off the display screen by the scroll operation, the map display device 20 outputs a warning to that effect by means such as voice or display. If the user of the map display device 20 knows the warning and stops the scroll operation, the guide route will not deviate from the display screen of the display means 27. When the user continues the scroll operation without noticing the warning, the scroll control means 29 invalidates the scroll operation by the scroll key 281. As a result, the guide route does not deviate from the display screen of the display means 27.

Note that the method of outputting the warning is not limited to voice or display, and the display screen of the display unit 27 may be configured to shine with a specific color light, and the map display device 20 may be a mobile terminal such as a mobile phone. In such a case, it may be configured to warn by vibration.
In addition to the method of invalidating the scroll operation, a method of calling attention to the user can also be adopted. In other words, when the user continues the scroll operation without noticing the warning, the scroll control means 291 continues to perform the scroll operation in which the map data for scrolling is different from the normal map display image and the guide route deviates from the display screen. Make it easy to see what is being done.

  As described above, the scroll map data used here is the polygon data of natural features such as rivers, mountains, coastlines, parks, etc., except that the scroll map data extracting means 23 excludes road data from the map data. Only. When a scroll operation is performed in such a direction that the guide route can no longer be displayed on the display screen or the movement amount, the scroll control means 29 switches from the normal map data to the natural feature data for scrolling, and the display means 27 displays only the natural feature. Scroll the map image. As a result, the user of the map display device 20 can easily recognize that the guidance route has deviated from the display screen based on the difference in the map images, and gives the user a misunderstanding such as an error of the display device. Disappears.

  Next, map data will be described. FIG. 9 is a diagram showing map data stored in the map database 34. In the communication-type navigation system, the distribution method of the guidance route, guidance point, and guidance data (voice data, etc.) can take various forms. For example, the route search condition transmitted by the route search server 30 from the map display device 20 is used. The guide route is searched according to the above, the guide route data set with the guidance points as described above is created, and the guide route from the departure point to the destination is transmitted to the map display device 20 in a lump, and the map data is displayed on the map. Based on the map request from the apparatus 20, it transmits to the map display apparatus 20.

  That is, route data and map data are separately delivered from the route search server 30 to the map display device 20, and the map display device 20 includes the route from the route data when there is a shortage in map data necessary for map display. The route search server 30 can be requested to deliver the unit map. Normally, the map data is delivered to the map display device 20 as map data of nine mesh units that are adjacent to each other in the up, down, left, and right and diagonal directions centering on the mesh unit map data including the current position.

  The map data accumulated in the map database 34 is composed of unit map data divided by a predetermined latitude / longitude range as shown in FIG. That is, as shown in FIG. 9, the map data is divided into map areas in units of predetermined latitude and longitude, and is configured as mesh unit map data M11 to M33. When distributed to the map display device 20, the unit map data M21, M23, and M12 adjacent to the unit map data M22 including the current position PP of the map display device 20 in the vertical direction, the horizontal direction, and the diagonal direction are centered. , M32, M11, M13, M31, and M33, a total of nine unit maps are distributed.

  When the map display device 20 moves and the map data is insufficient, the moving direction of the map display device 20 is determined, and the route search server 30 delivers the insufficient unit map data. The same applies when the map display device 20 designates a specific point or POI position and makes a map data distribution request. The guide route data is distributed to the map display device 20 together with the vector map data. The map display device 20 thus receives the map data and the guidance route data from the route search server 30 and displays the map image and the guidance route image on the display means 27.

Next, the concept of route search in the route search server 30 will be described.
The route search network database 35 stores road network data for route search for cars and pedestrians. FIG. 10 is a schematic diagram showing the concept of road network data. The road network data includes roads (routes) as their nodes and inflection points as nodes, routes connecting each node as links, node data, link data, and cost information (distance and required time) of all links. ) And is made into a database.

  For example, when the road is composed of roads A, B, and C as shown in FIG. 10, the end points, intersections, and bending points of the roads A, B, and C are used as nodes, and the roads connecting the nodes are directed links. Link cost data with node data (node latitude / longitude), link data (link number) and link cost of each link (link distance or time required to travel the link) as data Composed.

  That is, in FIG. 10, Nn (◯ mark) and Nm (◎ mark) indicate nodes, and Nm (◎ mark) indicates a road intersection. Directional links connecting the nodes are indicated by arrow lines (solid line, dotted line, two-dot chain line). As for the links, there are links facing in the upward and downward directions of the road, but in FIG. 10, only the links in the direction of the arrows are illustrated for the sake of simplicity.

  When a route search is performed using such road network data as route search data, the link that is linked from the departure node to the destination node is traced and the link cost is accumulated, so that the accumulated link cost is minimized. Search for and guide. That is, in FIG. 10, when a route search is performed with the departure point as the node AX and the destination as the node CY, the road travels from the node AX to the road A, turns right at the second intersection, enters the road C, and reaches the node CY. The link cost is accumulated sequentially, and a route that minimizes the accumulated link cost is searched for and guided.

  Although other routes from the node AX to the node CY are not shown in FIG. 10, there are actually other such routes, so that a plurality of routes that can be reached from the node AX to the node CY are displayed. A search is performed in the same manner, and a route with the lowest link cost is determined as the optimum route. This method is performed by, for example, a known method called the Dijkstra method.

  When the map display system 10 has a pedestrian route search function, the route search network database 35 may store the network data of transportation facilities. In the network data of transportation facilities, trains and buses operating on each route (corresponding to a road link) are represented as separate links each having a time based on the operation timetable.

  Next, the map display procedure of the map display system according to the present embodiment will be described in detail with reference to the flowchart shown in FIG. In step S101, a route search request is made, and the route search server 30 searches for a guide route in step S102, and distributes guide route data and map data to the map display device 20. The map display device 20 receives these data, displays a map, a guide route, a current position mark, etc. on the display means 27 in the process of step S103, and starts route guidance.

  When the map display device 20 starts route guidance, the GPS receiver 22 measures (acquires) the current position in the process of step S104. The positioning of the current position is generally performed periodically at regular time intervals, and the progress of the vehicle on the guide route is displayed. When the current position is measured, the map image is displayed on the display means 27 in the process of step S105, and the current mark indicating the current position of the guide route and the map display device 20 is displayed (drawn). The map image displayed here is the entire map image in a predetermined range centered on the current position.

  In the process of step S106, the map display device 20 determines whether or not a scroll operation has been performed. If a scroll operation is not detected, it is determined whether or not the destination has been reached in step S110. If the destination has been reached, the route guidance processing is terminated. If it has not arrived at the destination, the process returns to the positioning process of the current position in step S104.

  When a scroll operation is detected in the scroll detection process in step S106, the guide route display determination unit 291 displays a guide route image only in the guide route display determination region B (see FIGS. 7 and 8) in the process in step S107. It is determined whether or not it is in a displayed state, and it is determined whether or not the guide route is off the display screen by a scroll operation. If it is determined that the image of the guide route is not a scroll operation that deviates from the display screen (OK), the scroll control unit 29 proceeds to the process of step S108 and scrolls the map image.

  In the process of step S109, the scroll control means 29 detects whether or not the scroll operation is finished. If the scroll operation is continued, the process returns to the guide route display determination process of step S107. If the scroll operation has been completed, the process proceeds to step S110 to determine whether or not the destination has been reached. If it has arrived at the destination, the process ends. If it has not arrived at the destination, the process returns to the positioning process of the current position in step S104.

  If it is determined in the determination process of step S107 that the image of the guidance route is a scroll operation (NG) that deviates from the display screen, the process proceeds to the determination process of step S111 to detect whether or not the scroll operation is continued. If the scroll operation is continued, the process proceeds to step S112, and the scroll control means 29 invalidates the scroll operation and proceeds to the destination arrival determination process in step S110. If the scroll operation is not continued, the process proceeds to the destination arrival determination process in step S110 without doing anything. In the destination arrival determination process in step S110, if the destination has been reached, the process is terminated. If the destination has not been reached, the process returns to the positioning process for the current position in step S104.

  In the guidance route display determination process of step S107, at least a node indicating a guidance route only in the guidance route display determination region B is displayed regardless of whether or not a guide route image is displayed only in the guidance route display determination region B. It can also be determined that the guide route is a scroll operation that deviates from the display screen depending on whether two are displayed. That is, in the state where the nodes other than the two nodes at both ends of the guide route link are displayed in the guide route display determination region B, a plurality of links indicating the guide route are displayed in the guide route display determination region B. When scrolling to a state in which only two nodes are displayed, this indicates that only one guide route link is displayed. If the scroll process is continued, one guide route link is displayed. Is also determined to be highly likely not to be displayed on the display screen.

  Further, in place of the scroll invalidation process in step S112, the scroll map data extracting unit 23 may switch to a scroll map image of only the natural feature polygon data extracted from the map data and scroll display.

  In the above embodiment, the display means has a guide route display determination region having a certain width at the peripheral edge of the display region, and when the guide route image is displayed only in the guide route display determination region, the guide route image is displayed. Although the configuration for determining that the scroll operation deviating from the display screen has been described has been described, in the case where the above determination is performed based on the number of nodes of the displayed guide route, the entire display area can be determined as the determination area. If only at least two nodes at both ends of the link indicating the guide route are displayed in the display area, it is determined that a scroll operation for removing the guide route image from the display screen has been performed.

  In other words, in the state where the nodes other than the two nodes at both ends of the guide route link are displayed in the display area, a plurality of links indicating the guide route are displayed on the display screen, and only two nodes are displayed. When scrolling to the state, it indicates that only one guide route link is displayed, and if the scroll process is continued, no guide route link may be displayed on the display screen. It is determined that the property is high.

  When the determination based on the number of displayed nodes is used, if one link is long like an expressway, the node may not be displayed even if the guide route is displayed, and the above-described determination cannot be performed. In such a case, a bending point or a nodal point on the link may be used as a virtual node, and the above determination may be performed using the virtual node.

  As described above in detail, according to the map display system 10 according to the present invention, when the guide route is displayed and the route guidance is received, when the scroll operation for removing the guide route from the display screen is performed. A warning to that effect is notified, and the scroll display of the map can be controlled appropriately when the scroll operation is continued.

  The map data includes unit maps with different scales from a wide area map to a middle area map and a detailed map (city map), and the navigation system displays a map image using map data at a scale suitable for the route. It is common. When a wide area map is displayed and the entire guidance route is displayed on the display screen, there is no point in scrolling the map image itself, and the map image display method at the time of scrolling of the present invention is a guide such as a city map. This is suitable when only part of the route is displayed on the display screen.

  The present invention can be suitably applied to a map display system that uses a portable device with restrictions on the size of the display screen and the processing capability of the arithmetic unit as a map display terminal. Of course, the present invention can also be applied to a stand-alone type navigation device or a map display system using a personal computer (PC) connected to a map distribution server via a network as a map display device.

1 is a system configuration diagram showing a configuration of a map display system according to an embodiment of the present invention. It is a block diagram which shows the detailed structure of the map display system concerning the Example of this invention. It is a conceptual diagram for demonstrating the process which determines whether a guidance route remove | deviates from a display screen by scroll operation. It is a figure which shows the external appearance of the mobile telephone used as a map display apparatus. It is a figure which shows an example of the map image displayed on a display means during route guidance. It is a figure which shows an example of the map image in the case of reducing the data for scrolling and displaying the map image shown in FIG. 5 on the display means. It is a figure which shows the guidance route display determination area | region set to the peripheral part of the display area. It is a schematic diagram for demonstrating the specific example of the process which determines whether a guidance route remove | deviates from a display screen when the map image shown in FIG. 7 is scrolled. It is a figure which shows the map data accumulate | stored in a map database. It is a schematic diagram which shows the concept of road network data. It is a flowchart which shows the procedure of the map display in the map display system concerning the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Map display system 12 ... Network 20 ... Map display device 201 ... Control means 21 ... Communication means 22 ... GPS reception means 23 ... For scrolling Map data extraction means 24 ... Map data request means 25 ... Map data storage means 26 ... Guide data storage means 27 ... Display means 28 ... Operation input means 281 ... Scroll key 29... Scroll control means 291... Guide route display determination means 30... Route search server 301... Control means 31. ... Map database 35 .... Route search network database 36 ... POI information database 37 ... Delivery request storage means 38 ... Delivery data editing means

Claims (18)

A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display system having a map scroll function for displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means has a guide route display determination area having a constant width at the periphery of the display area, and the map display system includes a guide route display determination means and a scroll control means,
When the map image displayed on the display unit is scrolled by the scroll operation unit, the guide route display determination unit displays the guide route image when the guide route image is displayed only in the guide route display determination region. The map display system is characterized in that it is determined that a scroll operation has been performed to deviate from the display screen, and the scroll control means outputs a warning that the image of the guide route deviates from the display screen.   The guide route display determining means performs a scroll operation for removing the guide route image from the display screen based on the guide route image indicating the guide route displayed in the guide route display determination region or the number of nodes on the guide route. The map display system according to claim 1, wherein it is determined whether or not it has been.   After the guide route display determination means determines that a scroll operation has been performed in which the image of the guide route deviates from the display screen, and the scroll control means outputs a warning that the image of the guide route deviates from the display screen, 3. The map display system according to claim 1, wherein when the scroll operation by the scroll operation unit is continued, the scroll control unit invalidates the scroll operation by the scroll operation unit. 4. The map display system comprises scroll map data extraction means for extracting polygon data indicating natural features from map data and making the map data for scrolling,
After the guide route display determining means determines that a scroll operation has been performed in which the image of the guide route deviates from the display screen, the scroll control means outputs a warning that the image of the guide route deviates from the display screen, and then further The scroll control means displays the map image on the display means by using the scroll map data when the scroll operation by the scroll operation means is continued. Map display system. A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display system having a map scroll function for displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means uses a display area as a guidance route display determination area, and the map display system includes a guidance route display determination means and a scroll control means,
When the map image displayed on the display unit is scrolled by the scroll operation unit, the guide route display determination unit is based on the number of nodes on the guide route indicating the guide route displayed in the guide route display determination region. And determining whether or not a scroll operation has been performed in which the image of the guide route deviates from the display screen, and the scroll control means outputs a warning that the image of the guide route deviates from the display screen. Map display system.   If there is one link on the guide route displayed in the display area or the guide route display determination area and only one of the end point nodes of the link is displayed, the guide route display determining means 3. A node as a nodal point or an inflection point is used as a virtual node, and based on the number of nodes including the virtual node, it is determined whether or not a scroll operation is performed to disengage the image of the guide route from the display screen. Or the map display system of Claim 5. A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display device having a map scroll function for displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means has a guide route display determination area having a constant width at the periphery of the display area, and the map display system includes a guide route display determination means and a scroll control means,
When the map image displayed on the display unit is scrolled by the scroll operation unit, the guide route display determination unit displays the guide route image when the guide route image is displayed only in the guide route display determination region. The map display device is characterized in that it is determined that a scroll operation is performed to deviate from the display screen, and the scroll control means outputs a warning that the image of the guide route deviates from the display screen.   The guide route display determining means performs a scroll operation for removing the guide route image from the display screen based on the guide route image indicating the guide route displayed in the guide route display determination region or the number of nodes on the guide route. The map display device according to claim 7, wherein it is determined whether or not it has been.   After the guide route display determining means determines that a scroll operation has been performed in which the image of the guide route deviates from the display screen, the scroll control means outputs a warning that the image of the guide route deviates from the display screen, and then further The map display device according to claim 7 or 8, wherein when the scroll operation by the scroll operation means is continued, the scroll control means invalidates the scroll operation by the scroll operation means. The map display device includes scroll map data extracting means for extracting polygon data indicating natural features from map data and making the map data for scrolling,
After the guide route display determining means determines that a scroll operation has been performed in which the image of the guide route deviates from the display screen, the scroll control means outputs a warning that the image of the guide route deviates from the display screen, and then further 9. The scroll control unit according to claim 7 or 8, wherein when the scroll operation by the scroll operation unit is continued, the scroll control unit scrolls and displays a map image on the display unit using the scroll map data. Map display device. A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display device having a map scroll function for displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means uses a display area as a guidance route display determination area, and the map display system includes a guidance route display determination means and a scroll control means,
When the map image displayed on the display unit is scrolled by the scroll operation unit, the guide route display determination unit is based on the number of nodes on the guide route indicating the guide route displayed in the guide route display determination region. And determining whether or not a scroll operation has been performed in which the image of the guide route deviates from the display screen, and the scroll control means outputs a warning that the image of the guide route deviates from the display screen. Map display device.   If there is one link on the guide route displayed in the display area or the guide route display determination area and only one of the end point nodes of the link is displayed, the guide route display determining means 9. The node or the bending point is a virtual node, and based on the number of nodes including the virtual node, it is determined whether or not a scroll operation has been performed so that the image of the guide route deviates from the display screen. Or the map display apparatus of Claim 11. A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display method in a map display system having a map scroll function for displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means has a guide route display determination area having a constant width at the periphery of the display area, and the map display system includes a guide route display determination means and a scroll control means,
When the map image displayed on the display means is scrolled by the scroll operation means, the guide route display determination means displays the guide route image when the guide route image is displayed only in the guide route display determination area. A determination step for determining that a scroll operation has been performed that deviates from the display screen, and a warning step for outputting a warning that the image of the guide route deviates from the display screen by the scroll control means. Display method.   In the determination step, based on a guide route image indicating the guide route displayed in the guide route display determination area or the number of nodes on the guide route, whether or not a scroll operation is performed to remove the guide route image from the display screen. The map display method according to claim 13, further comprising a process of determining   The map display method further includes a step of invalidating the scroll operation by the scroll operation means when the scroll operation by the scroll operation means is continued after the warning step. The map display method according to claim 13 or 14. The map display system comprises scroll map data extraction means for extracting polygon data indicating natural features from map data and making the map data for scrolling,
When the scroll operation by the scroll operation means is further continued after the warning step, the scroll control means has a step of scrolling and displaying a map image on the display means using the scroll map data. The map display method according to claim 13 or 14. A route search means for searching for a guide route from a desired departure place to a destination; and a map database storing map data; and a map image in a predetermined range based on the map data read from the map database In a map display method having a map scroll function of displaying on a display unit together with a guide route and scrolling the displayed map image by a scroll operation unit,
The display means uses a display area as a guidance route display determination area, and the map display system includes a guidance route display determination means and a scroll control means,
When the map image displayed on the display means is scrolled by the scroll operation means, the guide route display determination means is based on the number of nodes on the guide route indicating the guide route displayed in the guide route display determination area. A determination step for determining whether or not a scroll operation has been performed in which the image of the guide route deviates from the display screen; and a warning step in which the scroll control means outputs a warning that the image of the guide route deviates from the display screen; The map display method characterized by having.   In the determination step, when there is one link on the guide route displayed in the display area or the guide route display determination area and only one of the nodes at the end point of the link is displayed, 15. The processing according to claim 14, further comprising: determining whether or not a scroll operation has been performed in which an inflection point is a virtual node and based on the number of nodes including the virtual node, the guide route image deviates from the display screen. Or the map display method of Claim 17.

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