JP2014145682A - Map display system, map display method, and map display program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a map display system, map display method, and map display program, by which the positional relation between map data before change and map data after the change can easily be grasped without adding a new display, such as an arrow, to display means before and after a change in map data display.SOLUTION: An on-vehicle navigator 1 comprises: a moving direction specifying part 6a configured to specify a moving direction from the current point to a changed destination; a relay point specifying part 6b configured to specify a current-point-side relay point, resultant of movement by a predetermined distance from the current point along the moving direction; a buffer part 6c configured to buffer current-point-side map data for slide-display of the map data; and a display control part 6d configured to cause a display 4 to sequentially carry out slide display from current map data to current-point-side relay map data and switch display from the current-point-side relay map data to changed destination map data.

Description

  The present invention relates to a map display system, a map display method, and a map display program.

  2. Description of the Related Art Conventionally, an in-vehicle navigation system capable of searching for a route to a destination point and guiding the searched route to a vehicle user has been used. In such an in-vehicle navigation system, a vehicle driving route to the destination point is searched and specified based on the input contents (name of destination point, address, telephone number, etc.) input by the user, and the current point of the vehicle By superimposing the position icon indicating the current location of the vehicle and the travel route of the vehicle up to the destination on the map data around the vehicle, and displaying it on display means such as a display, the vehicle travel route can be guided. Done.

  By the way, when the map data around the current location is displayed on the display means, the user may desire to confirm the map around the destination location. In such a case, it is necessary to change the display content of the display means from the map data around the current location to the map data around the destination location by the user's operation. Such a change is made, for example, when the user inputs the address of the destination point, etc., and the map data around the current point displayed on the display means is instantly switched to the map data around the destination point. Become. However, if the map data is changed instantaneously in this way, it is difficult for the user to grasp the positional relationship between the map data before and after the change of the map data. There is a problem that it is difficult to know in which direction the is located.

  Therefore, in order to solve such a problem, the direction in which the next changed map data is located is displayed by an arrow before the map data is changed, and the changed map data is located after the map data is changed. There has been proposed a map display device characterized in that information indicating the positional relationship between before and after the change of map data is displayed on the display means so that the direction is indicated by an arrow (for example, Patent Document 1). .

JP 2002-189410 A

  Here, the display means displays a lot of information such as place names, facility names, or guide maps. Therefore, when the display of an arrow is further added to the display unit as in the technique described in Patent Document 1, the display of the display unit becomes complicated. In addition, there is a possibility that the part that the user wants to browse is hidden by the arrow displayed on the display means. Therefore, there has been a demand for a map display system that can easily grasp the positional relationship between before and after the change of map data without adding a new display to the display means.

  The present invention has been made in view of the above, and before and after map data display change, map data before change and map data after change without adding a new display such as an arrow to the display means It is an object of the present invention to provide a map display system, a map display method, and a map display program capable of easily grasping the positional relationship with each other.

  In order to solve the above-described problems and achieve the object, the map display system according to claim 1 is a map that displays a plurality of map data stored in the map information storage means on the display means by changing each other. In the display system, the current map data including the current point currently displayed on the display unit is changed to change destination map data including a change destination point different from the current point and displayed on the display unit. In this case, a moving direction specifying unit that specifies a moving direction from the current point to the change destination point, and a current point moved by a predetermined distance from the current point along the moving direction specified by the moving direction specifying unit A relay point specifying means for specifying a side relay point, and the current point side relay point specified by the relay point specifying means from the current map data The current location side map data for slide display of the map data so as to reach the current location side relay map data is read from the map information storage means and buffered in the map drawing memory, and the map by the buffer means Based on the current location side map data buffered in the drawing memory, a slide display from the current location data to the current location side relay map data and switching from the current location side relay map data to the change destination map data Display control means for causing the display means to sequentially perform display.

  Further, the map display system according to claim 2 is the map display system according to claim 1, wherein the relay point specifying means moves a predetermined distance from the change destination point along a direction opposite to the moving direction. The change destination side relay point is identified, and the buffer means reaches the change destination map data from the change destination side relay map data including the change destination side relay point specified by the relay point specification means, The change-destination-side map data for displaying the map data in a slide manner is read from the map information storage means and buffered in the map drawing memory, and the display control means is the current data buffered in the map drawing memory by the buffer means. Based on the point side map data and the change destination side map data, a slice from the current map data to the current point side relay map data is obtained. Display, switching display from the current location side relay map data to the change destination side relay map data, and slide display from the change destination side relay map data to the change destination map data are sequentially performed on the display means. Let it be done.

  The map display system according to claim 3 is the map display system according to claim 2, wherein the display control means determines whether or not a distance between the current point and the change destination point is equal to or less than a predetermined distance. When it is determined that the distance is equal to or less than the predetermined distance, a slide display from the current map data to the change destination map data is performed.

  The map display system according to claim 4 is the map display system according to claim 2 or 3, wherein the display control means switches from the current location side relay map data to the change destination side relay map data. When displaying, in the state where the change destination side relay map data is displayed in the lower layer of the current point side relay map data, the transmittance of the current point side relay map data and the change destination side relay map data, Only the change-destination-side relay map data is displayed by increasing the transmittance so that only the point-side relay map data is displayed and increasing the transmittance of at least the current-point-side relay map data.

  The map display system according to claim 5 is the map display system according to claim 2 or 3, wherein the display control means switches from the current location side relay map data to the change destination side relay map data. When displaying, in the state where the current location side relay map data is displayed in the lower layer of the change destination side relay map data, the transmittance of the current location side relay map data and the change destination side relay map data, the current rate Only the change-destination relay map data is displayed by setting the transmittance so that only the point-side relay map data is displayed, and by reducing the transmittance of at least the change-destination relay map data.

  The map display method according to claim 6 is a map display method for displaying a plurality of map data stored in the map information storage means on the display means by mutually changing the map data. When the current map data including the current location is changed to the change destination map data including the change destination different from the current location and displayed on the display unit, the current location is changed from the current location to the change destination location. A moving direction specifying step for specifying a moving direction to reach; a relay point specifying step for specifying a current point side relay point that has moved a predetermined distance from the current point along the moving direction specified in the moving direction specifying step; From the current map data to the current point side relay map data including the current point side relay point specified in the relay point specifying step In addition, a buffer step of reading out the map data on the current location for displaying the map data from the map information storage means and buffering it in the map drawing memory, and the current location buffered in the map drawing memory in the buffer step Based on the side map data, the display means sequentially displays the slide display from the current map data to the current location side relay map data and the switching display from the current location side relay map data to the change destination map data. Display control step to be performed.

  A map display program according to claim 7 is a map display program for causing a computer to execute the method according to claim 6.

According to the map display system according to claim 1, the map display method according to claim 6, and the map display program according to claim 7, the moving direction from the current point to the change destination point is specified, and the current point By changing the display from the current map data to the destination map data, through the slide display to the current point side relay map data including the current point side relay point located in the specified moving direction from Since the map data is slid on the display means from the map data to the current location side relay map data along the moving direction, a new display such as an arrow is added to the display means before and after the display change of the map data. Therefore, the positional relationship between the map data before the display change and the map data after the display change can be easily grasped.
Also, in order to quickly display additional map data such as the current location side relay map data in this way, it is preferable to buffer the map data in the map drawing memory, but when a large number of map data is buffered In this case, there is a possibility that the map drawing memory is excessively consumed and the drawing speed is decreased. However, the map data before change and the map after change are buffered in the map drawing memory only for the current point side map data for slide display of the map data from the current map data to the current point side relay map data It is possible to buffer only the minimum range of map data necessary for grasping the positional relationship with the data in the map drawing memory, and it is possible to minimize the map drawing memory and improve the drawing speed Become.

  According to the map display system of claim 2, the change destination relay is performed by changing the display from the current map data to the change destination map data further via the display of the change destination relay point. Since the map data slides on the display means along the moving direction from the map data to the change destination map data, the positional relationship between the map data before the display change and the map data after the display change can be understood more easily. It is possible.

  Moreover, according to the map display system of claim 3, when the distance between the current point and the change destination point is relatively close, a change is made from the current map data by performing a slide display connecting these two points. Since the map data up to the destination map data can be displayed on the display means sequentially, in addition to the positional relationship between the map data before the display change and the map data after the display change, the current location and the destination location It is possible to visually grasp the distance.

  In addition, according to the map display system of claim 4, the destination relay map data displayed in the lower layer is smoothly displayed by increasing the transmittance of the current point side relay map data displayed in the upper layer. Therefore, the switching display from the current location side relay map data to the change destination side relay map data can be performed smoothly.

  According to the map display system of claim 5, the change destination side relay map data displayed on the upper layer can be smoothly displayed by reducing the transmittance of the change destination side relay map data displayed on the upper layer. Therefore, the switching display from the current location side relay map data to the change destination side relay map data can be performed smoothly.

It is a block diagram which illustrates in-vehicle navigation concerning Embodiment 1 of the present invention. It is a figure which shows the map data stored in map DB. It is a figure which shows each map data notionally. It is a flowchart of a display control process. 5 is a flowchart of a display control process following FIG. 5 is a flowchart of a display control process following FIG. It is a figure which represents the display of a display notionally, Comprising: (a) is a figure which represents the 1st step notionally, (b) is a figure which represents the 2nd step notionally, (c) is the figure which represents FIG. 3 is a diagram conceptually showing three stages, and FIG. 4D is a diagram conceptually showing a fourth stage. It is a figure which shows notion distance map data notionally. It is a flowchart of the display control process which concerns on Embodiment 2 of this invention. It is a figure which represents the display of a display notionally, Comprising: (a) is a figure which represents the 1st step notionally, (b) is a figure which represents the 2nd step notionally, (c) is the figure which represents FIG. 3 is a diagram conceptually showing three stages, and FIG. 4D is a diagram conceptually showing a fourth stage. It is a figure which shows the other moving directions roughly. It is a figure showing notionally the display of the display concerning a modification.

  Hereinafter, embodiments of a map display system, a map display method, and a map display program according to the present invention will be described in detail with reference to the drawings. However, the present invention is not limited by these embodiments.

[Embodiment 1]
First, the first embodiment will be described.

  The map display system according to the first embodiment is a map display system that changes a plurality of map data to each other and displays them on a display. In particular, the map display system according to the first embodiment uses map data around a position (hereinafter referred to as a current location) on map data of an in-vehicle navigation system (hereinafter referred to as in-vehicle navigation) specified by a known method. Display control processing to be described later when the map data around the current location is changed to map data around another location different from the current location (hereinafter referred to as a change destination location) in the state displayed on the display Is a map display system for executing Here, in the first embodiment, the case where the in-vehicle navigation functions as a map display system by installing the map display program in the in-vehicle navigation will be described. In addition, a portable type such as a smartphone or a tablet PC is described. You may comprise a map display system by the arbitrary apparatuses containing an information terminal. In addition, regarding the function as the in-vehicle navigation in the map display system, the configuration for achieving the map display function will be described in particular, and other functions can be obtained by the same configuration as the known in-vehicle navigation. The description will be omitted. Hereinafter, a vehicle equipped with this in-vehicle navigation will be referred to as “own vehicle” as necessary. The “vehicle” includes a two-wheeled vehicle and a bicycle in addition to a four-wheeled vehicle.

(Constitution)
First, the configuration of the in-vehicle navigation 1 according to the first embodiment will be described. FIG. 1 is a block diagram illustrating an in-vehicle navigation 1 according to Embodiment 1 of the present invention. As shown in FIG. 1, the in-vehicle navigation 1 schematically includes a speaker 2, a touch panel 3, a display 4, a current location detection unit 5, a control unit 6, a data storage unit 7, and a map drawing memory 8. Has been.

(Configuration-Speaker)
The speaker 2 is output means for outputting various sounds based on the control of the control unit 6. The specific form of the sound output from the speaker 2 is arbitrary, and it is possible to output a synthesized sound generated as necessary or a sound recorded in advance.

(Configuration-touch panel)
The touch panel 3 receives various manual inputs from the user when pressed by a user's finger or the like. The touch panel 3 is formed to be transparent or translucent, and is provided on the front surface of the display 4 so as to overlap the display surface of the display 4. As the touch panel 3, for example, a publicly known touch panel provided with operation position detecting means by a resistance film method or a capacitance method can be used.

(Configuration-Display)
The display 4 is a display unit that displays various images based on the control of the control unit 6, and particularly a display unit that displays a map based on map data stored in a map DB 7 a described later. The specific configuration of the display 4 is arbitrary, and a flat panel display such as a known liquid crystal display or organic EL display can be used.

(Configuration-Current location detection unit)
The current location detection unit 5 is current location detection means for detecting the current location of the host vehicle. For example, the current position detection unit 5 has at least one of a GPS, a geomagnetic sensor, a distance sensor, and a gyro sensor (all of which are not shown), and the current position (coordinates) and direction of the in-vehicle navigation 1 are known. Detect by method. In the first embodiment, it is assumed that the current location detection unit 5 is a GPS.

(Configuration-control unit)
The control unit 6 is a control means for controlling the in-vehicle navigation 1, and specifically, a CPU, various programs interpreted and executed on the CPU (basic control programs such as OS, and specific functions activated on the OS And an internal memory such as a RAM for storing the program and various data. In particular, the map display program according to the first embodiment is substantially installed in the in-vehicle navigation 1 via an arbitrary recording medium or network, thereby substantially configuring each unit of the control unit 6.

  The control unit 6 includes a movement direction specifying unit 6a, a relay point specifying unit 6b, a buffer unit 6c, and a display control unit 6d in terms of functions.

  The movement direction identification unit 6a is a movement direction identification unit that identifies the movement direction from the current point to the change destination point. Here, the “movement direction” is a direction that indicates in which direction the change destination point is located with respect to the current point of the vehicle, and is specifically expressed as a straight line from the current point to the change destination point. Direction. The relay point specifying unit 6b is a relay point specifying unit that specifies a current point side relay point that has moved a predetermined distance from the current point along the movement direction specified by the movement direction specifying unit 6a. The buffer unit 6 c is a buffer unit that reads map data from a map DB 7 a (described later) and buffers it in the map drawing memory 8. The display control section 6d is a display control means for causing the display 4 to sequentially perform slide display from the current map data to the current location side relay map data, switching display from the current location side relay map data to the change destination map data, and the like. It is. Specific processing performed by each unit of the control unit 6 will be described later.

(Configuration-data storage unit)
The data storage unit 7 is a storage unit that stores a program and various data necessary for the operation of the in-vehicle navigation 1, and is configured using, for example, a hard disk (not shown) as an external recording device. However, any other recording medium including a magnetic recording medium such as a magnetic disk or an optical recording medium such as a DVD or a Blu-ray disk can be used instead of or together with the hard disk.

  The data storage unit 7 includes a map database (hereinafter, the database is referred to as “DB”) 7a.

  The map DB 7a is map information storage means for storing map data. “Map data” includes, for example, road link data (road link number, connection node number, road coordinates, road type, number of lanes, travel regulations, etc.), node data (node number, coordinates), feature data (signals, Road signs, guardrails, buildings, etc.), target feature data (intersections, temporary stop lines, railroad crossings, curves, ETC toll gates, highway exits, etc.), facility data (location of each facility, type of each facility, etc.), topographic data The map display data for displaying the map on the display 4 is included.

(Configuration-map drawing memory)
The map drawing memory 8 is temporary storage means for buffering map data, and is formed as a RAM, for example. Here, in the map drawing memory 8, “current location side map data” and “change destination side map data” are appropriately buffered in the processing described later. Here, FIG. 2 is a diagram showing map data stored in the map DB 7a. FIG. 3 is a diagram conceptually showing each map data. Hereinafter, referring to FIG. 2 and FIG. 3, “current map data” and “change destination map data”, and “current map data” which is map data necessary to explain these map data ”,“ Current location side relay map data ”,“ change destination map data ”and“ change destination side relay map data ”will be described.

  First, the “current map data” is map data including the current location currently displayed on the display 4. Specifically, the map data is obtained by reading out the display range centered on the current location from the map data stored in the map DB 7a. Here, the “display range” is a rectangular range having a size substantially corresponding to the display range of the display 4 based on the display magnification set by the user or automatically set under a predetermined condition. It is a range that has been enlarged or reduced.

  Similarly to the current map data, the current location side relay map data, the change destination map data, and the change destination relay map data are also part of the map data stored in the map DB 7a. Although the map data is enlarged or reduced based on the same display magnification, these are map data centered on different positions.

  Specifically, the “current location side relay map data” is a location on the line connecting the current location and the change destination location that has moved a predetermined distance from the current location along the direction of travel (hereinafter referred to as the current location side). This is rectangular map data centered on the relay point. The “change destination map data” is map data including a destination point for route guidance that is a change destination point, and is a rectangular map that is finally displayed on the display 4 by executing a display control process described later. It is data. In addition, “change destination relay map data” is a point on the line connecting the current point and the change destination point that has moved from the change destination point by a predetermined distance along the direction opposite to the movement direction (hereinafter “current”). This is rectangular map data centered on a point-side relay point.

  The “current location side map data” is map data for slidingly displaying the map data so as to reach the current location side relay map data described above from the current map data described above. Specifically, at least, Current map data, current location side relay map data, and map data between these current map data and current location side relay map data, and specific setting examples will be described later.

  The “change-destination-side map data” is map data for slidingly displaying map data from the change-destination-side relay map data to the change-destination map data. Specifically, at least the change-destination map data Map data in a range including both the map data and the change destination side map data, and a specific setting example will be described later.

(processing)
Next, display control processing executed by the vehicle-mounted navigation 1 configured as described above will be described. Here, FIG. 4 is a flowchart of the display control process. 5 and 6 are flowcharts of the display control process following FIG. Hereinafter, the display control process will be described with reference to FIGS. 4, 5, and 6 as appropriate.

  First, the start conditions of this display control process will be described. This display control process is activated when the current map data displayed on the display 4 is changed to change destination map data including the change destination point and displayed on the display 4. Specifically, in the first embodiment, the user operates the touch panel 3 to input the name of the destination point, and the control unit 6 stores the point of the name that matches the input destination point name in the map DB 7a. When searching from the searched map data, the present map data is displayed when the current map data displayed on the display 4 is changed to the change destination map data including the searched destination point and displayed on the display 4. In addition, since the process in which the control unit 6 searches for the destination point as described above can be executed in the same manner as a known route search process, detailed description thereof is omitted.

(Processing-Display control processing)
First, the control unit 6 acquires current map data (SA1). Here, a specific method for acquiring the current map data is arbitrary. For example, the current location of the vehicle can be detected by the current location detection unit 5, and rectangular map data centered on the detected current location of the vehicle can be retrieved from the map DB 7a. However, in the first embodiment, since the display control process is started in the state where the current map data is already displayed on the display 4 as described above, the acquisition of the current map data can be omitted.

  Next, the control part 6 acquires change destination map data (SA2). Here, a specific method for acquiring the change destination map data is arbitrary. For example, a point searched from the map data based on the name of the destination point input by the user as described above is specified as the change destination point, and rectangular map data centered on this change destination point is read from the map DB 7a. Can be obtained. At this time, based on the display magnification of the current map data (display magnification set by the user or automatically set under a predetermined condition), the map data of a rectangular range having a size substantially corresponding to the display range of the display 4 (Hereinafter, the same applies to the acquisition of other map data).

  Next, the moving direction specifying unit 6a specifies the moving direction (SA3). Specifically, the coordinate position (latitude and longitude) of the current point and the coordinate position of the change destination point are specified based on the map data stored in the map DB 7a, and based on the difference between the two specified coordinate positions. The moving direction is specified by extracting the angle from the current point to the change destination point. In the first embodiment, as shown in FIG. 2, since the change destination point is located in the direction illustrated by the dotted line with the current point as a reference, this direction is specified as the moving direction.

  Next, the display control unit 6d determines whether or not the distance between the current point and the change destination point is equal to or less than a predetermined distance (SA4). Specifically, it is possible to specify the position coordinates of the current point and the change destination point stored in the map DB 7a, and obtain the distance between the current point and the change destination point based on the difference between these position coordinates. . The predetermined distance can be set to an arbitrary value. For example, the user may input and set the predetermined distance using the touch panel 3.

  And when it determines with the distance of both points not being below a predetermined distance (SA4, No), the relay location specific | specification part 6b specifies present location side relay map data (SA5). Specifically, the relay point specifying unit 6b first specifies a point that has moved a predetermined distance along the moving direction from the current point detected by the current point detecting unit 5 as the current point side relay point. The predetermined distance may be any value as long as the movement from the current point to the current point side relay point cannot be confirmed. However, the change in display 4 on the display 4 from the current map data to the current location-side relay map data is preferably viewed by the user as if the map data has moved on the display 4 by a certain distance. The geographical distance is preferably a different distance depending on the display magnification of the current map data. For example, when the display magnification of the current map data is relatively large (when the scale of the map is relatively large), the predetermined distance is relatively large, and when the display magnification of the current map data is relatively small (map In the case where the scale is relatively small), the predetermined distance is preferably relatively small.

  Next, the relay point specifying unit 6b specifies the change destination side relay map data (SA6). Specifically, first, the relay point specifying unit 6b specifies a point moved by a predetermined distance along the direction opposite to the moving direction from the change destination point input by the user as the change destination side relay point. The predetermined distance may be any value as long as the movement from the change destination relay point to the change destination point cannot be confirmed. However, since the change in the display on the display 4 from the change destination side relay map data to the change destination map data is preferably viewed by the user as if the map data has moved on the display 4 by a certain distance, the predetermined distance described above is used. The (geographic distance) is preferably a different distance depending on the display magnification of the current map data. Further, the predetermined distance may not be the same distance as the predetermined distance in SA5 described above. And the relay point specific | specification part 6b reads rectangular map data centering on a change destination side relay point from map DB7a similarly to SA5, and specifies change destination relay map data.

  Next, the buffer unit 6c buffers the current location side map data (SA7). Specifically, the buffer unit 6c reads the map data in the map DB 7a, and slides the map data on the display 4 so as to reach the current location side relay map data specified in SA5 from the current map data acquired in SA1. The possible range is specified as the current location side map data and buffered in the map drawing memory 8. Here, as described above, the current location side map data is map data in a range including at least both the current map data and the current location side relay map data. However, depending on processing convenience, etc. , It may be configured as map data including a range beyond that. For example, in the first embodiment, as shown in FIG. 3, the intersection of the extension of the left side of the current map data and the extension of the upper side of the current point side relay map data is the upper left point, and the lower left point of the current map data Is the lower left point, the intersection of the extension of the lower side of the current map data and the extension of the right side of the current location side relay map data is the lower right point, and the upper right point of the current location side relay map data is the upper right point. The map data of the rectangular range formed by connecting the lower left point, the lower right point, and the upper right point is specified as the current location side map data and buffered in the map drawing memory 8. Of the current point side map data that has been buffered in this way, an area above the straight line connecting the upper left point of the current map data and the upper left point of the current point side relay map data, and the lower right point of the current map data The area below the straight line connecting the lower right point of the current location side relay map data is the area that is not used for actual display. This is because the processing load and the processing time increase when the area is excluded (the same applies to the buffer of the map data on the change destination side and the map data at the short distance described later).

  Next, the buffer unit 6c buffers the change destination side map data (SA8). Specifically, the buffer unit 6c reads the map data of the map DB 7a, and slides the map data on the display 4 so as to reach the change destination map data acquired in SA2 from the change destination relay map data acquired in SA6. The possible range is specified as the change-destination side map data and buffered in the map drawing memory 8. Here, the change-destination side map data is map data in a range including at least the change-destination map data and the change-destination side map data, as described above. , It may be configured as map data including a range beyond that. For example, in the first embodiment, as shown in FIG. 3, the intersection of the extension line on the left side of the change destination side relay map data and the extension line on the upper side of the change destination map data is the upper left point, and the change destination side relay map data The lower left point of is the lower left point, the intersection of the extension line of the lower side of the destination relay map data and the extension side of the right side of the destination map data is the lower right point, and the upper right point of the destination map data is the upper right point. Map data in a rectangular range formed by connecting the upper left point, lower left point, lower right point, and upper right point is specified and buffered as change destination side map data.

  Next, the process proceeds to FIG. Here, FIG. 7 is a diagram conceptually showing the display on the display 4. In FIG. 7, map data indicated by a dotted line represents map data having a transmittance of 100%, and map data indicated by a solid line represents map data having a transmittance of 0% (the same applies to FIG. 10 described later). To do). As shown in FIG. 7, in the first embodiment, two types of map data are displayed separately in upper and lower layers, and the display mode is changed by appropriately changing the upper layer transmittance. For example, assuming that the transmittance of the lower layer is always 0% and the transmittance of the upper layer is 0%, the map data of the upper layer completely blocks the map data of the lower layer, so that only the upper layer is displayed on the display 4. Looks like. When the upper layer transmittance is 50%, the display of the upper layer map data is transparent to about half, so that the lower layer map data appears on the display 4 over the upper layer map data. Further, when the upper layer transmittance is 100%, the upper layer map data is completely transparent and cannot be displayed, so that only the lower layer map data appears on the display 4.

  First, as shown in the diagram conceptually showing the first stage in FIG. 7A, the display control unit 6d displays the current map data on the upper layer (SA10), and the change destination relay map data on the lower layer. Display (SA11). In this first stage, the transmittance of the upper layer is set to 0%, and the transmittance of the lower layer is set to 0%. That is, in this first stage, only the upper-level current map data appears on the display 4.

  Next, the display control unit 6d starts the upper layer slide display (SA12). Here, the “slide display” is to change the display of the display 4 as if the display position of the display 4 in the entire map data slides in the moving direction. The map data from the map data to the current location side relay map data is sequentially acquired from the current location side map data buffered in the map drawing memory 8 and displayed on the display 4. In this way, the display control unit 6d performs slide display until the upper layer reaches from the current map data to the current location side relay map data. Then, the display control unit 6d determines whether or not the current location side relay map data is displayed on the display 4 (SA13). And it waits until it determines with the present location side relay map data having been displayed (SA13, No), and when it determines with having displayed (SA13, Yes), the display control part 6d is 2nd of FIG.7 (b). As shown in the diagram conceptually showing the stage, the upper layer slide is stopped (SA14).

  Subsequently, the display control unit 6d performs switching display of map data. Here, the “switching display” is to change the display of the display 4 in an arbitrary manner, and includes the above-described display change by the slide display and the display change without the slide. The switching display in 1 will be described on the assumption that the display is changed by changing the transmittance of the layer. Specifically, first, the display control unit 6d increases the transmittance of the current point side relay map data displayed in the upper layer (SA15). Here, the pace of increase is arbitrary, but conceptually, the image is smoothly switched (transition display is performed) by gradually increasing the transmittance from 0% to 100%. Then, the display control unit 6d determines whether or not the transmittance of the upper layer has reached 100% (SA16).

  And it waits until the transmittance | permeability of an upper layer reaches 100% (SA16, No), and when it determines with having reached | attained (SA16, Yes), that is, only the change destination side relay map data of a lower layer seems to be displayed. When it becomes (as shown in the figure which represents the 3rd step of FIG.7 (c) conceptually), the display control part 6d starts the lower layer slide display (SA17). Specifically, map data from the change destination side relay map data to the change destination map data is sequentially acquired from the change destination side map data buffered in the map drawing memory 8 and displayed on the display 4. In this way, the display control unit 6d performs slide display until the lower layer reaches the change destination map data from the change destination side relay map data. Then, the display control unit 6d determines whether the change destination map data is displayed on the display 4 (SA18). And it waits until it determines with change destination map data having been displayed (SA18, No), and when it determines with having displayed (SA18, Yes), the display control part 6d performs the 4th step of FIG.7 (d). As shown in the conceptual diagram, the lower slide is stopped (SA19). This completes the display control process.

  In this way, the display control unit 6d converts the current map data to the current point side relay map data based on the current point side map data and the change destination side map data buffered in the map drawing memory 8 by the buffer unit 6c. The display 4 sequentially performs slide display, switching display from the current location side relay map data to the change destination side relay map data, and slide display from the change destination side relay map data to the change destination map data. At this time, since the display on the display 4 appears to have moved along the moving direction of the entire map data, the user can visually check the display on the display 4 to change in which direction the current location is used as a reference. It is possible to grasp visually and intuitively whether a point is located.

  If it is determined in SA4 of FIG. 4 that the distance between the current location and the change destination location is less than or equal to the predetermined distance (SA4, Yes), the buffer unit 6c buffers near-distance map data (SA9). . Here, FIG. 8 is a diagram conceptually showing the short-distance map data. As shown in FIG. 8, “short-range map data” is map data for slidingly displaying map data from the current map data to the change destination map data, specifically, at least the current map data. It is the map data of the range containing the map data of both map data and change destination map data.

  Further, as such a range, what kind of range is specifically buffered is arbitrary, but in the first embodiment, an extension line on the left side of the current map data and an extension line on the upper side of the change destination map data Is the upper left point, the lower left point of the current map data is the lower left point, the intersection of the extension line of the lower side of the current map data and the extension line of the right side of the destination map data is the lower right point, and the upper right side of the destination map data The map data in the rectangular range formed by connecting these upper left point, lower left point, lower right point, and upper right point is specified as the near-distance map data to the map drawing memory 8. Buffer.

  Then, moving to FIG. 6, the display control unit 6d displays the current map data (SA20) and starts slide display (SA21). Specifically, the map data from the current map data to the change destination map data is acquired from the near-distance map data buffered in the map drawing memory 8 and displayed on the display 4. By performing the slide display in this way, in the state where the change destination map data is displayed on the display 4 (SA22), the slide is stopped (SA23), and the display control process is ended. In addition, since the specific content of these slide displays was mentioned above, the description is abbreviate | omitted.

  As described above, when the distance between the current point and the change destination point is equal to or smaller than the predetermined distance, the capacity of the map data at the short distance does not increase so much. Even if the map data at the short distance is acquired, the in-vehicle navigation 1 The processing load does not increase extremely. Therefore, even if the display on the display 4 is a slide display from the current map data to the change destination map data, the processing load does not increase excessively, and the switching display such as the transition display described above is not performed. By consistently displaying slides, it is possible to more easily grasp the positional relationship between the current map data and the change destination map data, and to visually grasp the distance between the current location and the change destination point. It is possible.

(Effect of the first embodiment)
As described above, according to the first embodiment, the current direction relay map including the current point side relay point that is located on the specified moving direction from the current point is specified from the current point to the change destination point. By changing the display from the current map data to the change destination map data through the slide display to the data, the map data is displayed along the moving direction from the current map data to the current location side relay map data. Because of the slide display, the positional relationship between the map data before the display change and the map data after the display change is easy without adding a new display such as an arrow to the display 4 before and after the display change of the map data. Can be grasped.
In order to quickly display additional map data such as the current location side relay map data in this way, it is preferable to buffer the map data in the map drawing memory 8, but many map data are buffered. In this case, there is a possibility that the map drawing memory 8 is excessively consumed and the drawing speed is lowered. However, the map data before the change and the map data after the change are buffered in the map drawing memory 8 by buffering only the current point side map data for the slide display of the map data from the current map data to the current point side relay map data. Only the minimum necessary range of map data can be buffered in the map drawing memory 8 for grasping the positional relationship with the map data, and the map drawing memory 8 can be minimized and the drawing speed can be improved. Is possible.

  In addition, by changing the display from the current map data to the change destination map data while further passing through the display of the change destination relay point, the map data is changed from the change destination relay map data to the change destination map data. Since it is slide-displayed on the display 4 along the movement direction, it is possible to more easily grasp the positional relationship between the map data before the display change and the map data after the display change.

  In addition, when the distance between the current location and the change destination location is relatively close, the map data from the current map data to the change destination map data is sequentially displayed on the display means by performing a slide display connecting these two locations. Therefore, in addition to the positional relationship between the map data before the display change and the map data after the display change, it is possible to visually grasp the distance between the current point and the change destination point.

  Also, by increasing the transparency of the current location side relay map data displayed in the upper layer, it becomes possible to display the change destination side relay map data displayed in the lower layer smoothly, so from the current location side relay map data The switching display to the change destination side relay map data can be performed smoothly.

[Embodiment 2]
Next, a second embodiment of the present invention will be described. This form is a form in which switching display is performed by reducing the transmittance of the change destination side relay map data displayed on the upper layer. However, structures and processes not particularly described are the same as those in the first embodiment, and the same components as those in the first embodiment are the same as those used in the first embodiment as necessary. The description is abbreviate | omitted and attached | subjected.

(processing)
Since each component of the in-vehicle navigation 1 can be configured in the same manner as in the first embodiment, the description of the configuration of the in-vehicle navigation 1 will be omitted below, and the display according to the second embodiment will be described. The control process will be described.

(Processing-Display control processing)
FIG. 9 is a flowchart of display control processing according to Embodiment 2 of the present invention. The steps from SB1 to SB10 in FIG. 9 are steps corresponding to SA10 to SA19 in FIG. 5. Steps other than the steps from SB1 to SB10 are the steps from SA1 to SA9 and SA20 to SA25 in the first embodiment. Since it can be performed in the same manner, detailed description thereof is omitted.

  Here, FIG. 10 is a diagram conceptually showing the display on the display 4. As shown in FIG. 10, in the second embodiment, as in the first embodiment, two types of map data are displayed separately in upper and lower layers, and the transmittance of the upper layer is appropriately changed. To change the display mode.

  First, as shown in a diagram conceptually showing the first stage of FIG. 10A, the display control unit 6d displays the current map data in the lower layer as the first stage of display on the display 4 (SB1). ), The change destination relay map data is displayed on the upper layer (SB2). As described above, in the second embodiment, the current map data and the change-destination relay map data are displayed on the layers opposite to those in the first embodiment. Here, in the first embodiment, the upper layer transmittance is set to 0% in the first stage. However, in the second embodiment, in the first stage, the upper layer transmittance is set to 100%, The transmittance is set to 0%. That is, in this first stage, the upper layer change destination relay map data is not displayed because it is completely transparent, and only the lower layer current map data appears to be displayed on the display 4.

  Next, the display controller 6d starts lower layer slide display (SB3). Specifically, the map data from the current map data to the current location side relay map data is sequentially acquired from the current location side map data buffered in the map drawing memory 8 and displayed on the display 4. In this way, the display control unit 6d performs slide display until the lower layer reaches from the current map data to the current location side relay map data. Then, the display control unit 6d determines whether or not the current location side relay map data is displayed on the display 4 (SB4). And it waits until it determines with the present location side relay map data having been displayed (SB4, No), and when it determines with having displayed (SB4, Yes), the display control part 6d is 2nd of FIG.10 (b). As shown in the diagram conceptually showing the stage, the lower layer slide is stopped (SB5).

  Subsequently, the display control unit 6d performs switching display of map data. Specifically, the display control unit 6d decreases the transmittance of the change destination side relay map data displayed on the upper layer (SB6). Note that the pace at which the transmittance is reduced is arbitrary as in the first embodiment. Then, the display control unit 6d determines whether or not the transmittance of the upper layer has reached 0% (SB7).

  And it waits until the upper layer transmittance reaches 0% (SB7, No), and when it is determined that it has reached (SB7, Yes), that is, only the upper layer change destination relay map data appears to be displayed. When it becomes (as shown in the figure which represents the 3rd step of FIG.10 (c) conceptually), the display control part 6d starts the upper layer slide display (SB8). Specifically, map data from the change destination side relay map data to the change destination map data is sequentially acquired from the change destination side map data buffered in the map drawing memory 8 and displayed on the display 4. In this way, the display control unit 6d performs slide display until the upper layer reaches the change destination map data from the change destination relay map data. Then, the display control unit 6d determines whether the change destination map data is displayed on the display 4 (SB9). And it waits until it determines with the change destination map data having been displayed (SB9, No), and when it determines with having displayed (SB9, Yes), the display control part 6d performs the 4th step of FIG.10 (d). As shown in the conceptual diagram, the upper layer slide is stopped (SB10). This completes the display control process.

(Effect of the second embodiment)
As described above, according to the second embodiment, it is possible to smoothly display the change destination side relay map data displayed in the upper layer by reducing the transmittance of the change destination side relay map data displayed in the upper layer. Therefore, it is possible to smoothly perform switching display from the current location side relay map data to the change destination side relay map data.

[Modifications to Embodiment]
Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention can be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. Can do. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above contents, and may vary depending on the implementation environment and details of the configuration of the invention. May be solved, or only some of the effects described above may be achieved. For example, even if map display cannot be performed completely accurately, the convenience of map display can be improved slightly compared to the conventional case, or the convenience of map display comparable to the conventional case is If it can be achieved by a different technique, the problem of the present invention has been solved.

(About distribution and integration)
Further, each of the electrical components described above is functionally conceptual and does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution and integration of each part is not limited to the one shown in the figure, and all or a part thereof may be functionally or physically distributed or integrated in arbitrary units according to various loads or usage conditions. Can be configured. For example, each component of the map display system may be distributed and connected to each other via a network.

(About moving direction)
In each embodiment, the moving direction is an oblique direction, but the present invention is not limited to this. FIG. 11 is a diagram schematically showing other moving directions. As shown in FIG. 11, the moving direction is not limited to an oblique direction, and may be a vertical direction or a horizontal direction. Even in such a case, similarly, the range including the current map data and the current location side relay map data is set as the current location side map data, and the range including the change destination map data and the change destination side relay map data is set as the change destination side. Map data.

(About slide display)
Any one of the slide display from the change destination side relay map data to the change destination map data and the slide display from the current map data to the current point side relay map data may be omitted. Even if one of them is omitted, it is possible to specify the moving direction by performing the other slide display which is not omitted.

  Also, the slide speed in the slide display need not be constant. For example, the slide speed may be gradually increased near the start of the slide, or the slide speed is gradually decreased near the slide stop. You may let them.

  In the first embodiment, the slide display is stopped when the current point side relay map data is displayed, and then the switching display is started. However, the switching display is started without stopping the slide display. You may do it. That is, when the current location side relay map data is displayed while gradually increasing the transmittance of the current location side map data while performing a slide display from the current map data to the current location side relay map data. By making the transmittance 100%, it is possible to display the change destination side relay map data smoothly without stopping the slide display. The same applies to the second embodiment.

  In the example of the display screen in FIG. 2, the north-up display (true north is displayed at the top of the screen) is shown, but the head-up display (the traveling direction of the host vehicle is displayed at the top of the screen) is performed. Even if it is a case, each process can be performed similarly to the above.

(About switching display)
In each embodiment, when performing switching display, the upper layer transmittance is gradually increased from 0% to 100%. However, the present invention is not limited to this, and the upper layer transmittance is instantaneously changed from 0% to 100%. It may be increased.

(About relay points)
In each embodiment, the current point side relay point is specified so that the current map data and the current point side relay map data overlap, but the current point side relay point is specified so that these map data do not overlap. Also good. The same applies to the change destination relay point.

  A plurality of relay points may be specified. That is, the second current point side relay point is specified at a position moved a predetermined distance along the moving direction from the current point side relay point, and the second current point side relay map data including the second current point side relay point and Map data including the current location side relay map data is buffered in the map drawing memory 8 as current location side map data, and the current map data is transferred from the current map data via the current location side relay map data based on the current location side map data. You may perform the slide display which leads to 2 present location side relay map data. The same applies to the change destination relay map data.

(About the buffer)
In each embodiment, the current-point-side map data and the change-destination-side map data are buffered for speeding up the drawing process, but map data is sequentially obtained from the map DB 7a when performing slide display without buffering. You may get it.

(About start conditions)
In each embodiment, it has been described that the display control process is executed when the map data including the current point is changed to map data for displaying the destination point searched by the in-vehicle navigation 1 and displayed on the display 4. The display control process according to the present embodiment can be executed in any case as long as the display is changed from specific map data to other map data. FIG. 12 is a diagram conceptually showing the display of the display 4 according to the modification. As shown in FIG. 12, the display control process according to each embodiment is executed also when calling a plurality of points (points A to F in FIG. 12) registered as destination point candidates in the in-vehicle navigation 1 You may do it. For example, as shown in FIG. 12, when a point B is selected from a plurality of points, map data including the current point is changed to map data around the position of the point B and displayed on the display 4. The display control process according to the embodiment may be executed. Alternatively, nothing may be displayed on the display 4 in the initial state before the screen change, or any content other than the map may be displayed.

DESCRIPTION OF SYMBOLS 1 Car navigation system 2 Speaker 3 Touch panel 4 Display 5 Current location detection part 6 Control part 6a Movement direction specific | specification part 6b Relay point specific | specification part 6c Buffer part 6d Display control part 7 Data storage part 7a Map DB
8 Map drawing memory

Claims (7)

A map display system that mutually changes a plurality of map data stored by the map information storage means and displays the map data on the display means,
In the case where the current map data including the current location currently displayed on the display means is changed to change destination map data including a change destination location different from the current location and displayed on the display means, the current location A moving direction specifying means for specifying a moving direction from to the change destination point;
A relay point specifying unit for specifying a current point side relay point that has moved a predetermined distance from the current point along the moving direction specified by the moving direction specifying unit;
From the current map data, the current point side map data for sliding the map data so as to reach the current point side relay map data including the current point side relay point specified by the relay point specifying means, Buffer means for reading from the map information storage means and buffering it in the map drawing memory;
Based on the current location side map data buffered in the map drawing memory by the buffer means, a slide display from the current location data to the current location side relay map data and the change from the current location side relay map data Display control means for causing the display means to sequentially perform switching display to the destination map data;
A map display system comprising: The relay point specifying means specifies a change destination relay point that has moved a predetermined distance from the change destination point along a direction opposite to the moving direction,
The buffer means is a change destination for slidingly displaying map data so as to reach the change destination map data from the change destination relay map data including the change destination relay point specified by the relay point specifying means. Side map data is read from the map information storage means and buffered in the map drawing memory,
The display control means, based on the current location side map data and the change destination side map data buffered in the map drawing memory by the buffer means, from the current map data to the current location side relay map data. The display means sequentially displays a slide display, a switching display from the current location side relay map data to the change destination side relay map data, and a slide display from the change destination side relay map data to the change destination map data. Let the
The map display system according to claim 1. The display control means determines whether or not a distance between the current location and the change destination location is a predetermined distance or less, and determines that the change destination is determined from the current map data when it is determined that the distance is a predetermined distance or less. Display slides that lead to map data,
The map display system according to claim 2. The display control means includes
When performing switching display from the current location side relay map data to the change destination side relay map data,
In the state where the change-destination-side relay map data is displayed below the current-point-side relay map data, the transmission rates of the current-point-side relay map data and the change-destination-side relay map data are expressed as the current-point-side relay map data. With a transmissivity that only displays
Displaying at least the change destination side relay map data by increasing the transparency of at least the current location side relay map data;
The map display system according to claim 2 or 3. The display control means includes
When performing switching display from the current location side relay map data to the change destination side relay map data,
In the state where the current location side relay map data is displayed below the change destination side relay map data, the current location side relay map data and the transmission rate of the change destination side relay map data are determined as the current location side relay map data. With a transmissivity that only displays
Displaying at least the change destination side relay map data by reducing the transmittance of at least the change destination side relay map data;
The map display system according to claim 2 or 3. A map display method for changing a plurality of map data stored by a map information storage means and displaying them on a display means,
In the case where the current map data including the current location currently displayed on the display means is changed to change destination map data including a change destination location different from the current location and displayed on the display means, the current location A moving direction specifying step for specifying a moving direction from to the change destination point;
A relay point specifying step for specifying a current point side relay point that has moved a predetermined distance from the current point along the moving direction specified in the moving direction specifying step;
From the current map data, the current point side map data for sliding the map data to reach the current point side relay map data including the current point side relay point specified in the relay point specifying step, A buffer step for reading from the map information storage means and buffering it in the map drawing memory;
Based on the current location side map data buffered in the map drawing memory in the buffer step, a slide display from the current location data to the current location side relay map data and the change from the current location side relay map data A display control step for causing the display means to sequentially perform switching display to the destination map data;
Map display method including   A map display program for causing a computer to execute the method according to claim 6.

Images