JP4656586B2 - Mobile terminal, map distribution system, and program for displaying map data outside communication service area - Google Patents

Description

  The present invention relates to a portable terminal, a map distribution system, and a program that display map data outside a communication service area.

  Conventionally, a service for displaying map data on a display of a mobile terminal such as a mobile phone has been provided. The mobile terminal transmits position information measured by GPS (Global Positioning System) or the like to the map server via the mobile phone network, and receives map data around the position as a response. The received map data is displayed on the display of the mobile terminal. Such a service cannot be used unless the mobile terminal is located within a communication service area that can communicate with the base station.

  On the other hand, even when the mobile terminal is located outside the communication service area, the map data is downloaded in advance into the mobile terminal so that the map data can be displayed based on the measured position information. There is a technique (see Patent Document 1, for example). According to this technology, even if the mobile terminal is located outside the communication service area, map data corresponding to the position information can be displayed on the display.

JP 2006-010441 A

  However, according to the prior art, the mobile terminal must always download the latest map data. Since map data is image information, the data capacity is relatively large. In addition, as the map data becomes a high-definition image such as a photograph, the data capacity increases. In such a case, a broadband communication path is required to download map data from the map server. Therefore, according to Patent Document 1, an embodiment is described in which map data is downloaded by a personal computer via a wired connection, and the mobile terminal receives the map data from the personal computer.

  For example, it is assumed that a user who has a portable terminal is trying to climb a mountain and move from a communication service area to an outside area. At this time, the mobile terminal tries to download the latest mountain map data from the map server. Since the mobile access network is a narrow-band communication path, it takes time to download the latest and large-capacity map data. In particular, in the vicinity of the boundary of the communication service area, since the communication path of the wireless link is extremely narrow, it takes more time to download the map data, and eventually the download may be abandoned.

  Therefore, the present invention provides a mobile terminal capable of updating map data even when the mobile terminal moves out of the communication service area, even if it is near the boundary of the communication service area where only a narrow-band wireless link can be secured, and map distribution An object is to provide a system and a program.

According to the present invention, in a mobile terminal that communicates with a map server via a mobile network,
Mobile communication means for receiving, from a map server , terrain data that is an image in which coordinate system reference information in which SVG (Scalable Vector Graphics) image coordinates and latitude / longitude coordinates are associated is described and is not updated on the entire map;
Positioning means for positioning the current position information of the mobile terminal;
When the mobile terminal moves out of the communication service area, if it can only secure a wireless link with a narrow band less than or equal to a predetermined value, it is an image where coordinate system reference information is described and updated using mobile communication means and update map receiving unit that will receive the data,
Map data storage means for storing topographic data and point data;
The based rather topography data and location data to the current location information read out from the map data storing means, the spot data, are superposed with reference by a link to the image coordinates of latitude and longitude coordinates to match the SVG picture coordinates of the terrain data , a map superimposing means for generating one of the map data,
And map display means for displaying the superimposed map data on a display.

  According to another embodiment of the portable terminal of the present invention, the map update control means transmits a GET message including If-Modified-Since in the HTTP request header to the map server, and receives a response from the map server. It is also preferable to confirm the update of the point data.

According to a further embodiment of the mobile terminal of the present invention, the map data storage means, the terrain data one point data are linked even without less, it is preferable that is managed so as not to be deleted.

According to the present invention, there is provided a map distribution system having the above-described mobile terminal and a map server that communicates with the mobile terminal via a mobile network,
The map server
Map data storage means for storing and managing terrain data and point data based on an image in which coordinate system reference information is described ;
An update determination means for determining the update state of the point data using the map data storage means when receiving a request from the mobile terminal;
It has map data transmission means for transmitting topographic data and / or point data in response to a request from a portable terminal using map data storage means.

According to another embodiment of the map distribution system of the present invention,
About map server
Difference information deriving means for deriving difference information from the pre-update point data and the post-update point data;
A hash value calculating means for calculating an original hash value in the post-update point data;
The map data transmission means transmits the difference information and the original hash value,
For mobile devices,
The map update control means receives the difference information and the original hash value from the map server, and updates the difference information to the previous pre-update point data stored in the map data storage means.
It is also preferable to further include a hash verification unit that compares and verifies the calculated hash value in the post-update point data and the original hash value.

According to the present invention, in a program for functioning a computer mounted on a mobile terminal that communicates with a map server via a mobile network,
Mobile communication means for receiving, from a map server , terrain data that is an image in which coordinate system reference information that associates SVG image coordinates and latitude and longitude coordinates is described and is not updated in the entire map;
Positioning means for positioning the current position information of the mobile terminal;
When the mobile terminal moves out of the communication service area, if it can only secure a wireless link with a narrow band less than or equal to a predetermined value, it uses the mobile communication means and is an image in which coordinate system reference information is described and updated point data and update map receiving unit that will receive,
Map data storage means for storing topographic data and point data;
The based rather topography data and point data to the current location information read out from the map data storing means, the spot data, are superposed with reference by a link to the image coordinates of latitude and longitude coordinates to match the SVG image coordinates of terrain data , a map superimposing means for generating one of the map data,
The computer is caused to function as map display means for displaying the superimposed map data on a display.

  According to another embodiment of the mobile terminal program of the present invention, the map update control means transmits a GET message including If-Modified-Since in the HTTP request header to the map server, and sends a response from the map server. By receiving, the computer is made to function to confirm the update of the point data.

According to another embodiment of the portable terminal program according to the present invention, the map data storage means, the terrain data one point data are linked even without low, causing a computer to function so as to manage so as not to be deleted It is characterized by.

According to the present invention, there is provided a program for causing the above-described portable terminal to function as a computer mounted on a map server that communicates with the portable terminal via a mobile network,
Map data storage means for storing and managing terrain data and point data based on an image in which coordinate system reference information is described ;
An update determination means for determining the update state of the point data using the map data storage means when receiving a request from the mobile terminal;
Using the map data storage means, the computer functions as map data transmission means for transmitting terrain data and / or point data in response to a request from the portable terminal.

  According to the mobile terminal, the map distribution system, and the program of the present invention, when the mobile terminal moves out of the communication service area, the map data is updated even in the vicinity of the boundary of the communication service area where only a narrow-band wireless link can be secured. Therefore, the data can be received as much as possible by using small-capacity data of only point data (difference information + hash value). For the user, when moving out of the communication service area, the map data can be updated until just before that.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram according to the present invention.

  According to FIG. 1, the mobile terminal 1 communicates with the base station 2 via a wireless link. The base station 2 is connected to a mobile access network, and the mobile access network is interconnected to the Internet. A map server 3 is connected to the Internet. Thereby, the portable terminal 1 can receive desired map data from the map server 3.

  According to the present invention, the map server 3 stores and manages the map data by dividing it into terrain data and point data. The map server 3 first transmits the terrain data and the point data to the portable terminal 1, and then transmits only the updated point data to the portable terminal 1. The mobile terminal 1 displays one piece of map data in which the latest point data is superimposed on the terrain data on the display. The terrain data and the point data received from the map server 3 are stored in the map data storage unit of the mobile terminal 1.

  According to FIG. 1, the user who possesses the portable terminal 1 is moving out of the communication service area. When the mobile terminal 1 is located within the communication service area, the mobile terminal 1 accesses the map server 3 periodically or irregularly and receives the updated point data. The terrain data is high-definition and large-capacity image data such as photograph data, while the point data is small-capacity image data.

  When the mobile terminal 1 moves out of the communication service area, it cannot receive the updated point data from the map server 3. When the user wants to display the current position on the display of the mobile terminal 1, the mobile terminal 1 receives the radio wave of the GPS satellite 4 and measures the current position. And the portable terminal 1 searches the map data storage part for the terrain data and the point data based on the current position, superimposes the point data on the terrain data, and displays them on the display.

  FIG. 2 is map data in which terrain data and point data are superimposed.

  The mobile terminal 1 superimposes the point data on the terrain data and displays one map data. The terrain data means map data that is hardly updated, such as a mountain topographic map. On the other hand, the point data means point information that is updated on topographic data, such as mountain shooting spot information or transient event information that is updated according to the season.

  According to FIG. 2, the topographical data of the mountain is represented as the topographical data, and this is hardly updated. On the other hand, as spot data, spot data for summer shooting spots is different from spot data for winter shooting spots. Summer map data is displayed by superimposing summer point data on topographic data. Moreover, winter map data is displayed by superimposing winter point data on topographic data.

  FIG. 3 is a functional configuration diagram of the mobile terminal and the map server in the present invention.

  According to FIG. 3, the map server 3 includes a map data transmission unit 301, a map data storage unit 302, an update determination unit 303, a difference information derivation unit 304, and a hash value calculation unit 305. These functional units can also be realized by executing a program that causes a computer mounted on the map server to function.

  The map data transmission unit 301 uses the map data storage unit 302 to transmit terrain data and / or point data according to a request from the mobile terminal 1. Here, if the point data is not updated, a 304 response is transmitted to the mobile terminal 1. Further, the map data transmission unit 301 transmits the difference information output from the difference information deriving unit 304 and the original hash value output from the hash value calculation unit 305 as point data.

  The map data storage unit 302 stores and manages terrain data and point data.

  When the update determination unit 303 receives a request from the mobile terminal 1, the update determination unit 303 uses the map data storage unit 302 to determine the update state of the point data. Specifically, when a GET message including If-Modified-Since in the HTTP request header is received from the mobile terminal 1, the time of If-Modified-Since is compared with the update time of the point data.

  The difference information deriving unit 304 derives difference information from the pre-update point data and the post-update point data.

  The hash value calculation unit 305 uses the post-update point data as an argument to calculate an original hash value that is output from the hash function. An example of the hash function is MD5.

According to FIG. 3, the mobile terminal 1 includes a mobile communication unit 101, a positioning unit 102, a map update control unit (corresponding to an update map receiving unit) 103, a map data storage unit 104, a map superimposing unit 105, A map display unit 106 and a hash value verification unit 107 are provided. These functional units can also be realized by executing a program that causes a computer mounted on the mobile terminal to function.

  The mobile communication unit 101 receives from the map server 3 terrain data that is not updated for the entire map and point data that is updated.

  The positioning unit 102 uses the radio wave from the GPS satellite 4 to measure the current position information of the mobile terminal.

The map update control unit 103 controls reception of the point data updated by the map server 3. Specifically, the map update control unit 103 transmits to the map server 3 a GET message including If-Modified-Since (last update time) in the HTTP request header as follows.
GET photo.tar HTTP / 1.1
Host: foo.bar
If-Modified-Since: Mon, 21 Aug 2006 18:13:40 JST

  The map server 3 that has received this HTTP request, if the point data photo.tar has been updated after the If-Modified-Since time, stores the point data (difference information in the case of update) in the entity body of the HTTP response. ) Is included. Conversely, if it has not been updated after the If-Modified-Since time, a 304 response is returned. Thereby, the map update control part 103 of the portable terminal 1 can confirm the update of point data. Tar represents the map data archive method.

When updated point data (x-tar format) is included in the HTTP response, the following response header is added.
svg-name: Shooting point
svg-about: http://foo.bar/photo.tar
Last-Modified: Mon, 21 Aug 2006 18:13:40 JST
Content-Length: 4096
Content-Type: application / x-tar
requires: http://foo.bar/map.tar

When the updated point data includes difference information (gdiff format) and the original hash value (F7D2F84588A88304CE352E2B2A1FFB76), the following response header is added.
svg-about: http://foo.bar/photo.tar
Last-Modified: Tue, 23 Aug 2006 15:00:00 JST
Content-Length: 1024
Content-Type: application / gdiff
requires: http://foo.bar/map.tar
svg-check: F7D2F84588A88304CE352E2B2A1FFB76

  The map update control unit 103 receives the difference information and the original hash value from the map server, applies the difference information to the previous pre-update point data stored in the map data storage unit 104, and derives post-update point data. The post-update point data and the original hash value are notified to the hash value verification unit 107. When the map update control unit 103 receives a notification of “valid” from the hash value verification unit 107, the map update control unit 103 stores the updated point data in the map data storage unit 104. On the other hand, if the notification of “invalid” is received from the hash value verification unit 107, the updated point data is not accumulated in the map data accumulation unit 104.

  The map data storage unit 104 stores the terrain data and point data received from the map server 3. Here, the map data storage unit 104 manages the terrain data by linking the point data, and the terrain data to which at least one point data is linked is managed so as not to be deleted.

  Based on the current position information, the map superimposing unit 105 uses the map data storage unit 104 to superimpose the spot data on the terrain data to generate one map data.

  The map display unit 106 displays the superimposed map data on the display.

  The hash verification unit 107 receives the post-update point data and the original hash value from the map update control unit 103. Then, the hash verification unit 107 calculates a calculated hash value from the hash function using the post-update point data as an argument. The calculated hash value is verified by comparison with the original hash value. As a result of the verification, “valid” and “invalid” are notified to the map update control unit 103.

  Here, the correspondence of the position between the terrain data and the point data will be described. The map superimposing unit 105 associates positions using, for example, CRS.

  According to SVG1.1 Specification, coordinate system reference information is defined as CRS (Coordinate Reference System). The coordinate system reference information refers to information in which SVG image coordinates are associated with actual latitude / longitude coordinates. The SVG image coordinates are represented by the x axis (rightward is positive) and the y axis (downward is positive), and the latitude and longitude coordinates are represented by east longitude and north latitude.

  The CRS is added in the “metadata” of the top-level “svg” element describing the map data. Specifically, it is described by RDF that defines 'crs: CoordinateReferenceSystem'.

  The definition of CRS follows the XML grammar described in the OpenGIS Recommendation on the Definition of Coordinate Reference System [OpenGIS Coordinate Systems]. An affine transformation parameter is used for the conversion of the two-dimensional data, and the parameter is described as an 'svg: transform' attribute. The 'svg: transform' attribute is added in the 'crs: CoordinateReferenceSystem' element.

The map represented in a rectangle with the SVG image coordinates (0, 0) as the upper left vertex and (100, 100) as the lower right vertex, and its metadata are expressed as follows.
<svg viewBox = “0 0 100 100”>
<svg>
<metadata>
<rdf: RDF xmlns: rdf = "http: //www.w3.og/1999/02/22-rdf-syntax-ns#"
xmlns: crs = "http://www.ogc.org/crs" xmlns: svg = "http://www.w3.org/svg">
<rdf: Description>
<crs: CoordinateReferenceSystem rdf: resource = "http://www.svg.ne.jp/wgs84"
svg: transform = "matrix (800.00,0,0, -1200.00, -111200.00,43200.00)"/>
</ rdf: Description>
</ rdf: RDF>
...
</ metadata>
...
</ svg>

The following description of the coordinate system reference information will be described.
<crs: CoordinateReferenceSyste m df: resource = "http://www.svg.ne.jp/wgs84"
svg: transform = "matrix (800.00,0,0, -1200.00, -111200.00,43200.00)"/>

'rdf: resource =' represents the coordinate system to be referenced. 'svg: tranform =' represents what transformation is applied from the coordinate system to be referred to when encoding into SVG. Six numerical values in matrix () correspond to 3 × 3 conversion matrices a, b, c, d, e, and f. The SVG image coordinates correspond to the original latitude and longitude coordinates from which the SVG image coordinates are calculated using a matrix.

  FIG. 4 is an explanatory diagram of difference information and hash values in the present invention.

  According to FIG. 4, a plurality of point data a, b and c are linked to the terrain data A. Therefore, the map data storage unit 104 of the mobile terminal 1 and the map data storage unit 302 of the map server 3 manage the terrain data by linking the point data. At this time, the terrain data to which at least one point data is linked is managed so as not to be deleted. Otherwise, there will be no terrain data superimposed on the point data.

Moreover, according to FIG. 4, difference information a1, a2, and a3 are created stepwise with respect to the point data a. The point data and the difference information have the following relationship.
Point data a
Point data a1 (= point data a + difference information a1)
Point data a2 (= point data a1 + difference information a2)
Point data a3 (= point data a2 + difference information a3)
In this case, it is possible to reduce the data capacity to be transferred when only the difference information a1 is transmitted to the portable terminal 1 than when the updated spot data a1 is transmitted to the portable terminal 1.

Furthermore, according to FIG. 4, a hash value is calculated for each piece of point data a1, a2, and a3. The point data and the hash value have the following relationship.
Point data a
Point data a1 (point data a + difference information a1)-> hash value a1
Point data a2 (point data a1 + difference information a2)-> hash value a2
Point data a3 (point data a2 + difference information a3)-> hash value a3

  The map server 3 transmits the difference information and the original hash value to the mobile terminal 1 as the updated point data. The mobile terminal 1 updates the received difference information to the previous point data (pre-update point data) to derive post-update point data. A calculated hash value is calculated from a predetermined hash function using the post-update point data as an argument. Then, the calculated hash value and the original hash value are compared, and if they match, they are updated normally, and if they do not match, they are updated erroneously.

  As described above in detail, according to the mobile terminal, the map distribution system, and the program of the present invention, when the mobile terminal moves out of the communication service area, near the boundary of the communication service area where only a narrow-band wireless link can be secured. Even so, it is possible to receive the data as much as possible by making the data for the update of the map data a small-capacity data of only the point data (difference information + hash value). For the user, when moving out of the communication service area, the map data can be updated until just before that.

  According to the various embodiments of the present invention described above, those skilled in the art can easily make various changes, modifications and omissions within the scope of the technical idea and the viewpoint of the present invention. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

It is a system configuration diagram in the present invention. This is map data in which topographic data and point data are superimposed. It is a functional block diagram of the portable terminal and map server in this invention. It is explanatory drawing of the difference information in this invention, and a hash value.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile terminal 101 Mobile communication part 102 Positioning part 103 Map update control part 104 Map data storage part 105 Map superimposition part 106 Map display part 2 Base station 3 Map server 301 Map data transmission part 302 Map data storage part 303 Update determination part 304 Difference Information deriving unit 305 Hash value calculating unit 4 GPS satellite

Claims (9)

In a mobile terminal that communicates with a map server via a mobile network,
Mobile communication means for receiving, from the map server , terrain data that is an image in which coordinate system reference information in which SVG (Scalable Vector Graphics) image coordinates and latitude and longitude coordinates are associated is described and is not updated on the entire map;
Positioning means for positioning the current position information of the mobile terminal;
When the mobile terminal moves out of the communication service area, if only a predetermined narrow band wireless link can be secured, the mobile communication means is used to update the image in which the coordinate system reference information is described . and update map receiving unit that will receive the point data,
Map data storage means for storing the terrain data and the point data;
Wherein to read out the topography data and the location data rather based on the current location information from the previous SL map data storing means, linking the spot data, the image coordinates of latitude and longitude coordinates to match the SVG image coordinates of the terrain data reference superposed by a map superimposing means for generating one of the map data,
A portable terminal comprising map display means for displaying the superimposed map data on a display. The updated map receiving means transmits a GET message including If-Modified-Since in an HTTP request header to the map server and receives a response from the map server to confirm the update of the point data. The mobile terminal according to claim 1. The map data storage means, the terrain data one point data are linked even without least the portable terminal according to claim 1 or 2, characterized in that it is managed so as not to be deleted. A map distribution system comprising: the portable terminal according to any one of claims 1 to 3; and a map server that communicates with the portable terminal via the mobile network,
The map server
Map data storage means for storing and managing the topographic data and the point data based on an image in which coordinate system reference information is described ;
An update determination unit that determines an update state of the point data using the map data storage unit when receiving a request from the mobile terminal;
A map distribution system comprising: map data transmission means for transmitting the terrain data and / or the point data in response to a request from the portable terminal using the map data storage means. About the map server
Difference information deriving means for deriving difference information from the pre-update point data and the post-update point data;
A hash value calculating means for calculating an original hash value in the post-update point data;
The map data transmission means transmits the difference information and the original hash value,
About the mobile terminal
The update map receiving means receives the difference information and the original hash value from the map server, and updates the difference information to the previous pre-update point data stored in the map data storage means,
5. The map distribution system according to claim 4, further comprising hash verification means for comparing and verifying the calculated hash value in the post-update point data and the original hash value. In a program for functioning a computer mounted on a mobile terminal that communicates with a map server via a mobile network,
Mobile communication means for receiving, from the map server , terrain data that is an image in which coordinate system reference information that associates SVG image coordinates and latitude and longitude coordinates is described and is not updated in the entire map;
Positioning means for positioning the current position information of the mobile terminal;
When the mobile terminal moves out of the communication service area, if only a predetermined narrow band wireless link can be secured, the mobile communication means is used to update the image in which the coordinate system reference information is described . and update map receiving unit that will receive the point data,
Map data storage means for storing the terrain data and the point data;
Wherein to read out the topography data and the location data rather based on the current location information from the previous SL map data storing means, linking the spot data, the image coordinates of latitude and longitude coordinates to match the SVG image coordinates of the terrain data reference superposed by a map superimposing means for generating one of the map data,
A program for a portable terminal, which causes a computer to function as map display means for displaying the superimposed map data on a display. The updated map receiving means transmits a GET message including If-Modified-Since in an HTTP request header to the map server, and receives a response from the map server, thereby confirming the update of the point data. 7. The portable terminal program according to claim 6, wherein the computer is caused to function. The map data storage means, the terrain data one point data are linked even without least the portable terminal according to claim 6 or 7, characterized in that causes a computer to manage so as not to be deleted Program. A program for causing a mobile terminal according to any one of claims 1 to 3 to function as a computer mounted on a map server that communicates with the mobile terminal via the mobile network,
Map data storage means for storing and managing the topographic data and the point data based on an image in which coordinate system reference information is described ;
An update determination unit that determines an update state of the point data using the map data storage unit when receiving a request from the mobile terminal;
A program for a map server, which causes a computer to function as map data transmission means for transmitting the terrain data and / or the point data in response to a request from the portable terminal using the map data storage means.

Images