JP2009156605A - Communication type navigation system, and method and program thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide more guide information, even in a situation where communication is disabled, by receiving and holding map data on different reduced scales. <P>SOLUTION: This communication type navigation system has a communication part which transmits the present location to a center system and receives the map data on a plurality of reduced scales which are related to a prescribed range including the present location; a storage part which holds the map data that the communication part has received; and a display control part which reads out the map data on the set reduced scale from the storage part and makes a display part display the same. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a communication-type navigation apparatus, method, and program for acquiring map data having a plurality of scales by communication and displaying a map.

  The communication type navigation device in the prior art acquires map data stored in the center device via a computer network such as the Internet or a mobile communication network. Further, the communication type navigation device includes a current position calculation unit that calculates current position information represented by latitude and longitude, and displays a map around the current position using the calculated current position information and the acquired map data. Display on the screen.

  Such a communication-type navigation apparatus has an advantage that it can always refer to the latest map, and requires only a small amount of data to be held, and can be reduced in size and weight.

However, when the communication status is poor or the communication speed is slow, there is a problem that a part of the map data cannot be received and the map display is lost. On the other hand, for example, it has been proposed to receive and hold the entire route map from the departure point to the destination in advance, and display the entire route map when the reception state deteriorates (for example, Patent Document 1).
JP 2003-240578 A

  However, the conventional communication type navigation device can display a map with a different scale only by displaying the entire route map until the communication state is recovered when the map data cannot be acquired due to a change in the communication state. There wasn't.

  The present invention has been made to solve the conventional problems, and provides a communication type navigation apparatus, method, and program capable of displaying a map with a reduced scale even when data cannot be acquired through communication. Objective.

  A first aspect of the communication type navigation device according to the present invention is a communication type navigation device that transmits / receives data to / from a center device, transmits a current position to the center device, and includes a plurality of predetermined ranges including the current position. A communication unit that periodically receives map data at a reduced scale, a storage unit that selects and holds the map data received by the communication unit under predetermined conditions, and map data that is stored in the storage unit. And a display control unit that reads out the scaled map data and displays the map data on the display unit.

  With this configuration, when the communication becomes impossible and the map data cannot be received, the map data of another scale received in advance can be displayed.

  The storage unit is characterized by holding map data of all scales within a predetermined range including the current position.

  With this configuration, when it becomes impossible to communicate and map data can no longer be received, when displaying the map data in a wide area, even when you want to display the detailed map data at a larger scale, It can be displayed without interruption.

  In addition, the storage unit holds map data having at least a scale displayed on the display unit as a widest scale.

  In addition, the storage unit stores map data having a scale including at least the destination and the entire route as a widest scale.

  In addition, the storage unit stores map data of a scale displayed on the display unit first, and thereafter stores map data of a more detailed scale.

  In addition, the storage unit is characterized by first holding the map data of the widest scale including the destination and all routes, and thereafter holding the map data of a more detailed scale.

  Also, when the user gives an instruction to change the scale via the input unit, if there is no map data of the scale instructed in the storage unit and reception by the communication unit is not possible, the user is notified that the scale cannot be changed. And a control unit.

  With this configuration, even when the communication becomes impossible and the map data cannot be received, it is possible to present to the user whether or not the scale can be changed.

  The second aspect is a communication-type navigation method for transmitting / receiving data to / from a center device, wherein a current position is transmitted to the center device, and a plurality of scale map data in a predetermined range including the current position is periodically transmitted. The communication step to be received in the communication step, the storage step for selecting the map data received in the communication step under a predetermined condition and holding it in the storage unit, and the map data of the instructed scale from the map data held in the storage unit Is read from the storage unit and displayed on the display unit.

  A third aspect is a communication-type navigation program for sending and receiving data to and from the center apparatus that causes the computer to execute the following steps, transmitting the current position to the center apparatus, and a predetermined range including the current position, A communication step for periodically receiving a plurality of scale map data, a storage step for selecting the map data received in the communication step under a predetermined condition and holding it in the storage unit, and the map data held in the storage unit And a display control step of reading out map data of the instructed scale from the storage unit and displaying the map data on the display unit.

  In the present invention, map data with different scales is acquired in advance through communication and stored in the storage unit, so that even when communication is impossible, the map scale can be changed and displayed. A possible communication type navigation device can be provided.

  Hereinafter, a communication navigation apparatus 1 according to an embodiment of the present invention will be described with reference to the drawings. In each drawing, components that are not directly related to the present invention are not shown.

  FIG. 1 is a block diagram showing a configuration of a communication type navigation apparatus 1 according to the first embodiment of the present invention.

  The communication navigation device 1 includes a communication unit 2, a storage unit 3, a positioning unit 4, a control unit 5, a display control unit 6, a display unit 7, and an input unit 8.

  The communication unit 2 transmits / receives data to / from the communication type navigation device 1 and the center device 20 including the map database 21 via communication means such as mobile phone data communication or wireless LAN. The map stored in the map database 21 is updated so that the map is always in the latest state.

  The storage unit 3 temporarily stores map data acquired from the center device 20.

  The positioning unit 4 is for measuring the current position, speed, and traveling direction of the host vehicle, and is, for example, a GNSS (Global Navigation Satellite System) receiver, a vehicle speed sensor, a gyro (angular velocity) sensor, an acceleration sensor, or the like. . The GNSS receiver is a GPS receiver, for example, which receives radio waves from a plurality of satellites and demodulates them to measure the absolute position of the receiver. The current position, speed, and direction of travel of the vehicle can be measured using a GNSS receiver and various sensors alone or in combination.

  The control unit 5 controls the operation of the communication navigation device 1 as a whole. The control unit 5 includes a CPU or MPU, a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. When the CPU or MPU executes a program stored in the ROM, the operation of each functional block shown in FIG. 1 is controlled. The CPU and MPU use the RAM as a work area during execution of the program.

  The display control unit 6 has a function of displaying a map image around the current position temporarily stored in the storage unit 3 on the screen of the display unit 7 together with a vehicle position mark, an optimum route, and the like as necessary. The optimal route indicates a route from the current position to the destination designated by the user, and a line segment is often superimposed on the road.

  The display unit 7 is a display device such as a liquid crystal display or an organic EL display, for example.

  The input unit 8 is for a user to input an operation instruction. As an example of the input unit 8, for example, a predetermined number of push-type switches arranged, a touch panel type, a remote control type, a user's voice is recognized and converted into input information to the communication navigation device 1. A microphone, a speech recognition engine, etc. can be mentioned. Examples of instruction contents from the user include destination search, waypoint setting, destination setting, route search condition setting, route search execution, scale change (enlargement / reduction) instruction, and the like.

  The operation of the map display process of the communication navigation device 1 configured as described above will be described with reference to FIG.

  First, the control unit 5 transmits the current position measured by the positioning unit 4 (step S101) to the center device 20 via the communication unit 2 (step S102). As shown in FIG. 3, the map database 21 stored in the center device 20 stores block data divided into a certain size for each map data having different scales, and the center device 20 stores the map data. Send in blocks.

  For example, in the center device 20 in which map data of 1 / 500,000, 1/1000, and 1/1500 / 10,000 is accumulated in order from a wide area, the latitude / longitude information transmitted from the communication type navigation device 1 is stored. Based on this, the stored map data in a predetermined range is transmitted to the communication type navigation device 1. The communication unit 2 receives the map data transmitted from the center device 20 (step S103).

  FIG. 4 shows the map data transmitted from the center device 20, and all the scales stored in the center device 20 with map data around the current position, here as an example, 1 / 500,000 / 100,000 / min. 1. Map data of a scale of 1/1000 and 2500/1. Next, the received map data is stored in the storage unit 3 (step S104). The display control unit 6 controls the display unit 7 to display the map data of the scale set from the stored map data or the scale selected by the user (step S105). Thus, the map display process ends. This map display process is repeated at predetermined time intervals, and map data corresponding to the current position is held in the storage unit 3.

  As described above, according to the communication type navigation device 1 of the present embodiment, by receiving all the scale map data around the current position accumulated in the center device 20, communication becomes impossible and map data cannot be received. Even when a situation arises, you can display everything from detailed maps to wide-area maps.

  Next, in the above example, map data of all scales within a predetermined range is received by the communication unit 2 and all stored in the storage unit 3, but only map data of a necessary scale is received or stored. Another screen display example in the case of the above will be described with reference to FIG.

  FIG. 5 shows a state where the current position and 1 / 10,000 map data are displayed on the display unit 7. At this time, when the map data of 1/2500 of the detailed scale is present in the range divided by the dotted line, the communication type navigation device 1 indicates the map data of 1/10000 through the communication unit 2. Map data of 1/2500 of a more detailed scale of the map range is received from the center device 20.

  In this way, even when communication becomes impossible and map data cannot be received, by changing to a detailed map within the range displayed on the display unit 7, according to the movement of the current position, A detailed map can be displayed without interruption.

  Next, the map data acquisition procedure will be described in detail with reference to the flowchart of FIG.

  One-2,500 map data set to be displayed by the user is received and displayed (step S601). Next, the control unit 5 determines whether or not the destination and the route are set. When the destination and the route are not set (No in step S602), the control unit 5 starts from the wide area map data in order of 1 / 500,000. 1 / 10,000 and 1 / 10,000 map data are received (steps S606, S607, S608) and stored in the storage unit 3.

  When the destination and the route are set in step S602 (Yes in step S602), the control unit 5 determines from the detailed map data whether or not there is map data of a scale including the destination and all the routes. When the determination is made in order (steps S603, S604, and S605) and it is determined that the destination and all the routes are included, the map data of the scale and the map data more detailed than the scale are received from the center device 20. For example, when the destination and all routes are included in map data of a scale of 1: 100,000 (Yes in step S605), map data of 1: 100,000 and 1: 10,000 are stored in the storage unit 3 (step S607). And step S608). If it is determined that the destination and the entire route are not included (No in step S605), the map data is received in order from the scale data of 1 / 500,000.

  As described above, when the destination and route are set, when the destination is close to the current position and map data of a wide area such as 1 / 500,000 is not required, unnecessary map data Map data can be received efficiently without reception.

  Next, a process for determining whether the content instructed by the user can be performed will be described.

  FIG. 7 is a flowchart for determining whether or not a scale map instructed by the user can be displayed at the current position.

  First, it is determined whether or not the map data of the point designated by the user and the scale (step S709) is held in the storage unit 3 of FIG. 1 (step S710), and if held, the display unit 7 of FIG. (Step S714). If not, it is determined whether communication is possible at the current position (step S711). If communication is possible, map data is acquired from the center device 20 and displayed. If communication is impossible at the current position (No in step S711), information that cannot be executed is presented to the user, and the process ends.

  As described above, when the map cannot be processed because the map of the scale instructed by the user cannot be communicated at the current position, the user can be notified of whether the scale can be changed without communication.

  In the present invention, a software program (in the embodiment, a program corresponding to the flowchart shown in the figure) is supplied to the apparatus, and the computer of the apparatus reads the supplied program. And the case where it is achieved by executing. Therefore, in order to implement the functional processing of the present invention on a computer, the program itself installed in the computer also implements the present invention. That is, the present invention also includes a navigation program for realizing the functional processing of the present invention.

  As described above, the communication type navigation apparatus according to the present invention is useful as a communication type navigation apparatus that can present more guidance information in response to a user's operation instruction.

The block diagram which shows the communication-type navigation apparatus in embodiment of this invention Flow chart showing the flow of map display processing The figure which shows an example of the map database hold | maintained at the center apparatus 20 The figure which shows an example of the map data acquired from the center apparatus 20 The figure which showed the state in which the present position and 1 / 10,000 map data are displayed on the display part 7. Flow chart showing map data acquisition procedure The flowchart which shows the process which determines whether execution of a user instruction is possible

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Communication type navigation apparatus 2 Communication part 3 Storage part 4 Positioning part 5 Control part 6 Display control part 7 Display part 8 Input part 20 Center apparatus

Claims (9)

A communication type navigation device for sending and receiving data to and from a center device,
A communication unit that transmits a current position to the center device and periodically receives a plurality of scale map data in a predetermined range including the current position;
A storage unit that selects and holds the map data received by the communication unit under a predetermined condition;
A display control unit that reads out map data of an instructed scale from the map data held in the storage unit, and displays the map data on a display unit;
A communication type navigation device comprising: The communication type navigation device according to claim 1, wherein the storage unit holds map data of all scales within a predetermined range including the current position. The communication type navigation device according to claim 1, wherein the storage unit holds map data having a scale displayed on the display unit as a widest scale. The communication type navigation device according to claim 1, wherein the storage unit holds map data having a scale including at least a destination and all routes at a scale of the widest range. The communication type navigation device according to claim 3, wherein the storage unit first holds map data of a reduced scale displayed on the display unit, and thereafter holds map data of a more detailed scale. 5. The communication type according to claim 4, wherein the storage unit first holds map data of a widest scale including a destination and all routes, and thereafter holds map data of a more detailed scale. Navigation device. When the user gives an instruction to change the scale via the input unit, if there is no map data of the scale instructed in the storage unit and reception by the communication unit is not possible, a control for presenting to the user that the scale cannot be changed The communication type navigation apparatus according to claim 1, further comprising a unit. A communication-type navigation method for sending and receiving data to and from a center device,
A communication step of transmitting the current position to the center device and periodically receiving a plurality of scale map data in a predetermined range including the current position;
A storage step of selecting the map data received in the communication step under a predetermined condition and holding it in a storage unit;
A display control step of reading out map data of an instructed scale from the map data held in the storage unit and displaying it on the display unit;
A communication type navigation method comprising: A communication type navigation program for sending / receiving data to / from a center device, which causes a computer to execute the following steps:
A communication step of transmitting the current position to the center device and periodically receiving a plurality of scale map data in a predetermined range including the current position;
A storage step of selecting the map data received in the communication step under a predetermined condition and holding it in a storage unit;
A display control step of reading out map data of an instructed scale from the map data held in the storage unit and displaying it on the display unit
Communication-type navigation program with

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