JP4491423B2 - Map data providing method and map data providing program - Google Patents

Description

  The present invention relates to a map data providing program for causing a computer to function as an apparatus for providing map data to a client machine.

  Conventionally, map data is created and stored by each company as electronic data for electronically storing information related to maps. The contour is the contour of one section when the map is divided into several sections. When a predetermined Cartesian coordinate system is defined for the entire map, the contour data is expressed in the contour. As the line segment information, the coordinates of the start point and end point of each line segment when a building, road, river, and the like are expressed by several line segments are included.

  In recent years, a map display system has been developed that displays a map on a client machine that is communicably connected to a server machine that stores the outline data. In this map display system, when there is a request from the client machine to the server machine, map data is transmitted from the server machine to the client machine, and a map based on the map data is displayed on the client machine.

  The map data transmitted to the client machine was originally map image data generated by the server machine based on the outline data. However, if the map is frequently scrolled or scaled, the client machine Each time, the image data had to be read from the server machine. Therefore, in recent years, a method is being adopted in which the map data transmitted from the server machine to the client machine is not image data but map data itself. If this method is adopted, the client machine will perform processing related to scrolling and changing the scale. Therefore, once the map data is sent, the client machine needs to read the data frequently from the server machine. Disappear. However, it is necessary to install a client program for analyzing map data that is map data and displaying a map image on the client machine (see, for example, Patent Document 1).

  Also, recently, using the map display system as described above, business information such as equipment necessary for the work for the client machine of the gas pipe work, electric telephone wiring work, door inspection, or customer visit. There is a service to display a map with a mark. In this service, the service provider prepares map data including business information for each trader in advance, and the trader who is a user brings a client machine such as his / her portable information terminal to the work site, Map data including business information related to the current business is downloaded to the client machine and the map is displayed. Thereby, each user can utilize the map in which information, such as equipment required for work, is described at the work site.

JP 2002-229993A

  By the way, when a building in the map is represented by a line segment, at least four line segments are required even if the building has a simple rectangular shape. When this is a winding road or river, a large number of line segments are required to smoothly express the curve as a whole. Therefore, actual map data has a very large amount of line segment information.

  Because of such circumstances, in the map display system as described above, when map data is transmitted as map data to a client machine such as a portable information terminal with limited communication speed and processing speed, the client There was a problem that it took a very long time for the map to be displayed on the machine. If there is such a problem, when the gas pipe supplier or the electric wire supplier as described above brings his client machine to the work site and operates it, the map is not easily displayed, which hinders the work. Will be.

  The present invention has been made in view of the above-described problems of the prior art, and the problem is that map data including information related to the user's business is transmitted from the server machine to the client machine as map data. In some cases, a map data providing program for causing a server machine to function so that the amount of map data can be reduced as much as possible is provided.

  In order to solve the above problems, the map data providing program according to the first aspect of the present invention employs the following configuration.

  That is, the map data providing program according to the first aspect of the present invention includes a large number of map data that stores line segment information divided into hierarchies, a predetermined first type hierarchy, and a predetermined second type hierarchy. Information specifying one of the map data is sent from the client machine to the computer connected to the recording apparatus that records the correspondence information defined by associating with the client machine via the network. The map data and the correspondence information are read from the recording device, and the line corresponding to the first type of hierarchy defined by the correspondence information in the read map data is read. In the case where there is line segment information corresponding to all the first type hierarchies defined in the correspondence information in the read map data, it is determined whether or not the minute information exists. , The map data is sent as map data to the client machine as it is, and the read map data includes line segment information corresponding to any one of the first type layers defined in the correspondence information. If not, the map information is obtained by removing the line segment information corresponding to each second type hierarchy associated with the first type hierarchy in the correspondence information from the map data. It is characterized by transmitting to the client machine.

  In order to solve the above-described problem, the map data providing program according to the second aspect of the present invention employs the following configuration.

  That is, the map data providing program according to the second aspect of the present invention includes a large number of map data that stores line segment information divided into hierarchies, definition information that defines one or many predetermined first type hierarchies, And it connects with the recording apparatus which recorded many simple outline data produced | generated by removing the line segment information corresponding to one or many predetermined 2nd types of hierarchy from each said outline data. When information specifying any map data is sent from the client machine to a computer connected to the client machine via a network, the map data and the definition information are sent to the computer. Read out from the recording device, and in the read map data, determine whether or not line segment information corresponding to the first type of hierarchy defined in the definition information exists, and read out If there is line segment information corresponding to any of the first type defined in the definition information in the map data, the client machine is used as it is as map data. If there is no line segment information corresponding to all the first type layers defined in the definition information in the map data read and read, it corresponds to the map data The simple outline data to be read is read from the recording device, and the simple outline data is transmitted to the client machine as map data.

  In order to solve the above problem, the map data providing program according to the third aspect of the present invention employs the following configuration.

  That is, the map data providing program according to the third aspect of the present invention corresponds to a large number of map data that stores line segment information divided into hierarchies, a predetermined first type hierarchy, and a predetermined second type hierarchy. The correspondence information to be defined and the identification information indicating whether or not the line segment information corresponding to each first type hierarchy defined in the correspondence information exists in each map data are stored. When information specifying one of the outline data is sent from the client machine to a computer connected to the recording machine that records the table and connected to the client machine via the network, By reading out the outline data from the recording device and referring to the table, the readout outline data corresponds to the first type of hierarchy defined in the correspondence information. When it is determined whether or not line segment information exists, and line segment information corresponding to all the first type hierarchies defined in the correspondence information exists in the read map data Transmits the map data as map data to the client machine as it is, and in the read map data, the line segment information corresponding to any one type of hierarchy defined in the correspondence information is included. If it does not exist, the correspondence information is read from the recording device, and the line segment information corresponding to each second type hierarchy associated with the first type hierarchy by the correspondence information. Is removed from the map data and transmitted to the client machine as map data.

  When configured as described above, when the server machine is requested for map data from the client machine, the line data corresponding to the first type of hierarchy is included in the map data. The outline data is transmitted as it is from the server machine to the client machine. On the other hand, when the line segment information corresponding to the first type hierarchy is not included in the outline data, the line information corresponding to the second type hierarchy is removed from the outline data as the server Sent from machine to client machine. For this reason, one or a number of hierarchies that have line segment information for expressing the facilities necessary for the work are defined as the first type of hierarchies. If one or a plurality of hierarchies having line segment information for expression are defined as the second type of hierarchies, the above-described map data providing program according to the first to third aspects of the present invention is as follows. Make the computer function to work as follows. In other words, when a client machine with limited communication speed or processing speed is brought into the work site and a map is displayed on the client machine, map data that does not have a hierarchy of equipment required for work is displayed when there is no such equipment. After removing a hierarchy such as an unnecessary building, it is transmitted to the client machine as map data. That is, map data from which information unnecessary for business is deleted as much as possible is transmitted to the client machine. Accordingly, it is possible to suppress the time taken until the map is displayed on the client machine as much as possible, and as a result, the business is not hindered.

  In order to solve the above-described problem, the map data providing program according to the fourth aspect of the present invention employs the following configuration.

  In other words, the map data providing program according to the fourth aspect of the present invention corresponds to a large number of map data that stores line segment information divided into hierarchies, a predetermined first type hierarchy, and a predetermined second type hierarchy. Information that specifies any map data for a computer that is connected to a recording apparatus that records correspondence information to be defined and distance information related to a predetermined distance and is connected to a client machine via a network. Is sent from the client machine, the map data and the correspondence information are read from the recording device, and the first data defined in the correspondence information in the read map data is read. It is determined whether or not the line segment information corresponding to the type hierarchy exists, and the line segments corresponding to all the first type hierarchies defined by the correspondence information in the read outline data are determined. If the information is present, the map data is transmitted as map data to the client machine as it is, and any one of the first types defined in the correspondence information is read in the read map data. When there is no line segment information corresponding to the hierarchy, the map data and the distance information of all adjacent map figures adjacent to the map data of the map data are read from the recording device, Corresponding to the first type hierarchy defined by the correspondence information in the area from the border line on the contour side to the predetermined distance in the adjacent contour based on the contour data of the adjacent contour Whether or not line segment information is included is determined, and line segment information corresponding to all the first type hierarchies defined in the corresponding information is included in the region of any adjacent map. The map data is used as map data. When the line segment information corresponding to any one of the first type layers defined in the correspondence information is not included in the area of all adjacent maps, Transmits, as map data, data obtained by removing line segment information corresponding to each second type hierarchy associated with the first type hierarchy in the correspondence information to the client machine. It is characterized by making it.

  With this configuration, when the server machine requests map data from the client machine, if the line segment information corresponding to the first type of hierarchy is included in the map data, the map data is displayed. Data is sent as it is from the server machine to the client machine. On the other hand, even if the line segment information corresponding to the first type of hierarchy is not included in the outline data, it corresponds to the adjacent area on the boundary line side in the adjacent outline of the outline corresponding to the first type hierarchy. When the line segment information to be included is included, the outline data is transmitted as it is from the server machine to the client machine. And, when the line segment information corresponding to the first type hierarchy is not included in the adjacent area, the line segment information corresponding to the second type hierarchy is removed from the map data, Sent from the server machine to the client machine. For this reason, one or a number of hierarchies that have line segment information for expressing the facilities necessary for the work are defined as the first type of hierarchies. If one or a plurality of hierarchies having line segment information for expression are defined as the second type of hierarchies, the above-described map data providing program according to the fourth aspect of the present invention operates as follows. Make your computer function like. That is, when a client machine with limited communication speed or processing speed is brought into the work site and a map is displayed on the client machine, it is map data that does not have a hierarchy of equipment necessary for work, and Map data for which there is no equipment required for work in the adjacent area in the adjacent map box is sent to the client machine as map data after removing unnecessary layers such as buildings when there is no such equipment. . That is, map data from which information unnecessary for business is deleted as much as possible is transmitted to the client machine. Accordingly, it is possible to suppress the time taken until the map is displayed on the client machine as much as possible, and as a result, the business is not hindered.

  As described above, according to the present invention, when map data including information related to a user's business is transmitted as map data from the server machine to the client machine, the amount of map data can be reduced as much as possible. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1

  FIG. 1 is a block diagram schematically showing a computer network system to which the present invention is applied. This computer network system includes a client machine 10 and a server machine 20, and these machines 10 and 20 are connected to each other via a network N.

  FIG. 2 is a configuration diagram schematically showing the client machine 10. The client machine 10 includes a central processing unit (CPU) 10a, a random access memory (RAM) 10b, a display device 10c, an input device 10d, a communication control device 10e, and a recording device 10f.

  The CPU 10a is a central processing unit that controls the entire client machine 10. The RAM 10b is a recording device that temporarily records a part of a program used by the CPU 10a and frequently used data. The display device 10c is a display that displays various screens. The input device 10d is a keyboard having various keys, a trackball for operating a pointer, or a touch screen for pen input.

  The communication control device 10e is a device that controls transmission / reception of data by wired communication or wireless communication with a router connected to another computer via the network N. For example, a LAN (Local Area Network) connection board, A terminal adapter, modem, or radio frequency circuit.

  The recording device 10f is a device that reads and writes various data and programs, and specifically, is a hard disk device or a flash memory. The recording device 10f stores an operation system program for comprehensively managing hardware and software, and various data and programs. The programs stored in the recording device 10f include a web browser 11 and a map program 12.

  When the web browser 11 receives an input operation from the operator while being executed by the CPU 10a, the web browser 11 includes a URL (Uniform Resource Locator) set at that time in accordance with HTTP (HyperText Transfer Protocol) to the CPU 10a. An HTTP request is generated, and the HTTP request is transmitted to the server machine 20 indicated by the domain name in the URL. When the HTTP response is transmitted in response to the HTTP request, the web browser 11 displays a web browser screen indicating the web page or image indicated by the data in the main body of the HTTP response to the CPU 10a. To display.

  The map program 12 is a map display client program that is generally commercially available, and causes the CPU 10a to display a map on the display device 10c by using map data sent from the server machine 20. More specifically, the map program 12 has a search condition (address, telephone number, zip code, characteristic store name, or latitude and longitude) for searching a map to be displayed to the CPU 10a. It waits until it is input from the input device 10d by the operator, and when the search condition is input, the search condition is transmitted to the server machine 20 through the function of the web browser 11. The map program 12 causes the CPU 10a to wait until map data is transmitted from the server machine 20 through the function of the web browser 11, and when map data is received, the map program 12 is used for display based on the map data. Data is generated and a map is displayed on the display device 10c based on the display data.

  FIG. 3 is a configuration diagram schematically showing the server machine 20. The server machine 20 includes a CPU 20a, a RAM 20b, a display device 20c, an input device 20d, a communication control device 20e, a flexible disk drive (FDD) 20f, a compact disk drive (CDD) 20g, and a recording device 20h. The CPU 20a, RAM 20b, display device 20c, input device 20d, and communication control device 20e are the same as those of the client machine 10.

  The FDD 20f and the CDD 20g are devices that read data and programs stored in a flexible disk FD and a compact disk CD, which are computer-readable media, or write data and programs to the disks FD and CD. Data and programs read from the disks FD and CD by the drives 20f and 20g are installed in the recording device 20h.

  The recording device 20h is a device that reads and writes various data and programs. A large number of map data 21, a map management table 22, and a determination table 23 are recorded in the recording device 20h. In addition, an HTTP server program 24 and a map data distribution program 25 are recorded in the recording device 20h together with an operation system program for comprehensively managing hardware and software.

  The outline data 21 is so-called vector map data, and displays a large number of line segment information for representing identification objects such as buildings, roads, and rivers in the outline and the names of the identification objects in the outline. A large number of text information. In addition, the figure outline means the outline of one section when the map is divided into several sections, and the line segment information is the starting point of the line segment when a predetermined XY orthogonal coordinate system is defined for the entire map. X and Y coordinates and end point X and Y coordinates. Further, the map data 21 has a hierarchical data structure, and each segment has line segment information and text information.

  FIG. 4 is a table created for explaining the data structure of the map data 21. As shown in FIG. 4, the outline data 21 includes “key”, “layer name”, “start point X coordinate”, “start point Y coordinate”, “end point X coordinate”, “end point Y coordinate”, and “ It is configured by creating a record composed of item columns (fields) of “text” for each hierarchy.

  In the “key”, an identification number for uniquely identifying each layer is recorded. In the “layer name”, a name defined for each layer by the developer is recorded. In the “start point X coordinate”, “start point Y coordinate”, “end point X coordinate”, and “end point Y coordinate”, the start point X and Y coordinates and the end point X and Y coordinates of the line segment are recorded, respectively. However, in the case where the identification object to be expressed in the map is not composed of line segments, for example, a point or a description start position of text, the “end point X coordinate” and “end point Y coordinate” are blank. Yes. In the “text”, text information such as a local public organization name, a street name, a building name, and a store name is recorded. However, in the case of a hierarchy without text information, “text” is blank.

  The outline data 21 as shown in FIG. 4 is prepared for each outline defined on the map, and constitutes one outline data 21 group. Furthermore, a large number of such map data 21 groups are prepared for each customer of a service provider who performs a map data distribution service using the server machine 20. The customer of this service provider is, for example, a supplier who performs gas piping work, electric telephone wiring work, door inspection, or customer visit, and more specifically, a map on which work information such as equipment necessary for the work is described. Is a contractor using Then, the service provider creates the map data 21 group for the customer by incorporating the business information of one customer into the map data 21 group. In other words, the map data 21 is created by adding a hierarchy having business information of a service provider customer to many hierarchies created in advance by a map producer. In the example of FIG. 4, the layers having the identification numbers 1 to 9 are layers created in advance by the cartographer (that is, information common to all the map data 21 groups), and the identification numbers 10 to 10 are used. Thirteen hierarchies are hierarchies having the above-described business information (information different for each group of map data 21). However, FIG. 4 shows an example of the map data 21 including a hierarchy (business layer) having business information. However, if there is no equipment in the map, the map data 21 of the map is Does not include business layer.

  The outline management table 22 is a table for managing each outline data 21. The map management table 22 is prepared for each customer (that is, for each group of map data 21). FIG. 5 is a table created for explaining the data structure of the outline management table 22. As shown in FIG. 5, the outline management table 22 includes an “area name”, “lower left X coordinate”, “lower left Y coordinate”, “upper right X coordinate”, “upper right Y coordinate”, and It is configured by creating a record including an item field of “data storage position” for each outline data 21 (that is, for each outline).

  In the “map name”, a name defined in each map data 21 by the developer is recorded. In the “lower left X coordinate”, “lower left Y coordinate”, “upper right X coordinate”, and “upper right Y coordinate”, as shown in the explanatory diagram of FIG. The X and Y coordinates of the lower left corner and the X and Y coordinates of the upper right corner of the map in the coordinate system are recorded, respectively. In the “map data storage position”, an address that is a recording position of the map data 21 in the recording device 20h is recorded.

  The determination table 23 is a table used by a map data distribution program 25 described later. FIG. 7 is a table created for explaining the data structure of the determination table 23. As shown in FIG. 7, the determination table 23 is configured by creating a record composed of item fields of “business layer”, “unnecessary layer 1”, “unnecessary layer 2”,... For each business layer. Has been.

  In the “business layer”, a business layer that is added to the entire map data 21 group as a service provider that is a customer of the service provider (the identification number in the map data 21 of FIG. 4 has an identification number). 10 to 13 layer names) are recorded. In the “unnecessary layer 1”, “unnecessary layer 2”,..., The identification determined by the customer's supplier that it is not necessary to display in the map when there is no business layer in each map data 21 The layer name of the layer in which the object is included (the layer selected from the layers having identification numbers 1 to 9 in the map data 21 in FIG. 4) is recorded. Although only two “unnecessary layers” are shown in FIG. 7, in reality, the customer, who is the customer, may arbitrarily increase or decrease the number according to the business. When the number of unnecessary layers of any record in the determination table 23 is set to be smaller than that of other records, some “unnecessary layers” of the record are blank.

  The HTTP server program 24 is a so-called web server program, and when the CPU 20a receives an HTTP request from the client machine 10, it determines whether or not to call a function by another program based on the URL in the HTTP request. If not called, the data in the file indicated by the URL is sent to the client machine 10 as it is. If called, the function is called to execute the process, and the processed data is This program is transmitted to the client machine 10.

  The HTTP server program 24 is provided with a function for setting a correspondence relationship between a URL in the HTTP request and a function called corresponding to the URL. Which URL uses which function is set in advance by the developer of each application (web application) installed in the server machine 20. In the present embodiment, no function is called for the URL of text data described only in the markup language, and the function by the map data distribution program 25 is called only for the URL for calling the function by the map data distribution program 25. Is set to be.

  The processing executed by the CPU 20a by the map data distribution program 25 will be described later in detail with reference to FIG. 8 and FIG. 9, but the program 25 will be briefly described. The search condition sent together with the HTTP request from the machine 10 is received, the map data 21 to be transmitted to the client machine 10 is detected based on the received search condition, and the detected map data 21 is stored in the determination table 23. Is a program that causes the processed map data 21 to be transmitted to the client machine 10 as map data.

  Hereinafter, processing executed in the computer network system configured as described above will be described.

  First, in the server machine 20, the HTTP server program 24 and the map data distribution program 25 are read by the CPU 20a, so that the functions of both programs 24 and 25 are resident. Accordingly, the server machine 20 functions as a so-called map server.

  When the user of the client machine 10 operates the machine 10 to start up the map program 12, the search condition (address, telephone number, postal code, characteristic store name, or latitude and longitude) Is displayed on the display device 10c. Thereafter, when the user operates the input device 10d to input the search condition to a predetermined portion of the input screen and clicks the OK button, the function by the map program 12 is changed through the function by the web browser 11, The search condition is transmitted to the server machine 20 together with the HTTP request.

  On the other hand, the function of the HTTP server program 24 residing in the server machine 20 stands by until an HTTP request is sent from any of the client machines 10. When the function by the HTTP server program 24 receives an HTTP request, the function determines whether or not the URL in the HTTP request is a URL for which the function by the map data distribution program 25 should be called. If the URL has to call the function of the map data distribution program 25, the function of the map data distribution program 25 is called and the map data distribution process is executed. FIG. 8 is a flowchart showing the contents of the map data distribution process.

  In the first step S101 after the map data distribution process is started, the CPU 20a waits until a search condition is received from the client machine 10. When the search condition is received, the CPU 20a advances the process to S102.

  In S102, the CPU 20a executes a contour detection process. Since this outline detection processing is generally performed, it will not be described in detail. As an outline of the processing, the CPU 20a identifies one map name corresponding to the received search condition by referring to a table in which the search condition is associated with the map name of the map specified by the search condition. To do. In addition, when the client machine 10 needs to display a map adjacent to the map according to the position indicated by the search condition in the map with the map name, the CPU 20a The map name is also specified. After identifying one or several map names, the CPU 20a advances the process to S103.

  In S103, the CPU 20a reads all business layer names from the determination table 23 in the recording device 20h.

  In the next S104, the CPU 20a specifies the first map name among several map names specified in S102 as a processing target.

  In the next S105, the CPU 20a reads the map data 21 corresponding to the processing target map name from the recording device 20h with reference to the map management table 22 in the recording device 20h.

  In the next S106, the CPU 20a determines whether or not the line segment information corresponding to all business layer names read in S103 is included in the map data 21 read in S105. Then, if the line segment information corresponding to all business layer names is included in the map data 21, the CPU 20a advances the process to S108, and the line segment information corresponding to all business layer names is stored. If it is not included in the outline data 21, the process proceeds to S107.

  In S107, the CPU 20a executes map data processing. FIG. 9 is a flowchart showing the contents of this map data processing.

  In the first step S201 after the start of the map data processing, the CPU 20a identifies business layers that are not included in the map data 21, and records unnecessary layer names corresponding to these business layer names. All are read from the determination table 23 in 20h.

  In the next S202, if the map data 21 has line segment information corresponding to the unnecessary layer name read in S201, the CPU 20a uses the line segment data 21 corresponding to the unnecessary layer. Delete all information and text information. Thereafter, the CPU 20a ends the map data processing process, and advances the process to S108 in the main routine of FIG.

  In S108, the CPU 20a delivers the outline data 21 read in S105 or the outline data 21 processed in S107 to the function by the HTTP server program 24 as data included in the body of the HTTP response. On the other hand, the map data 21 is transmitted to the client machine 10 as map data.

  In the next S109, the CPU 20a determines whether or not there is an unprocessed name among the several map names specified in S102. Then, when there is an unprocessed map name, the CPU 20a advances the process to S110.

  In S110, the CPU 20a specifies the next processing target map name from the unprocessed map names, and returns the process to S105.

  If the unprocessed map name no longer exists during the execution of the processing loop of S105 to S110, the CPU 20a branches the process in S109 and ends the map data distribution process.

  Since the map data distribution process as described above is executed, the computer network system of the first embodiment has the following effects. That is, in the conventional system in which the unprocessed outline data 21 is distributed from the server machine 20, the client machine 10 must receive all the line segment information regardless of whether it is necessary for business. did not become. Therefore, as in the upper screen example in the explanatory diagram of FIG. 10, all the facilities necessary for business and all the identification objects have been expressed on the map. However, the server machine 20 according to the first embodiment does not have line segment information (in FIG. 10) that does not have line segment information for expressing facilities (circular electric poles A and B in FIG. 10) necessary for business. In the case of sending the map data 21 of Fig. 1 and Fig. 3) to the client machine 10 as map data, the identification data which is unnecessary for the business when there is no equipment from the map data 21 After the line segment information and text information of (C and E's buildings in FIG. 10) are removed, it is transmitted to the client machine 10 as map data. That is, map data in which information unnecessary for business is reduced as much as possible is sent to the client machine 20. Accordingly, the time until the client machine 10 such as a portable information terminal with a limited communication speed or processing speed displays a map is shortened as much as possible, and the lower screen in the explanatory diagram of FIG. As in the example, the identification objects necessary for the business are surely represented on the map. As a result, a trader who performs business using the client machine 10 can smoothly perform the business by relying on the maps sequentially displayed on the client machine 10.

  The computer network system of the first embodiment has a communication environment using HTTP, but is not limited to this communication environment. For example, it may have a communication environment using a communication line in accordance with this system-dedicated protocol, or may have a communication environment using a wireless communication line relayed by a communication satellite. Other communication environments may also be used.

  In the computer network system of the first embodiment, the map data 21 is transmitted as it is from the server machine 20 to the client machine 10, but this need not be the case. For example, the server machine 20 compresses the map data by the compression means generally used, the server machine 20 transmits the compressed map data to the client machine 10, and the client machine 10 decompresses the map data. The map data 21 may be transmitted from the server machine 20 to the client machine 10.

  In the computer network system according to the first embodiment, the figure has been described as having a rectangular shape (see FIGS. 6 and 10), but the shape is not limited to this. For example, the contour may be a parallelogram, a hexagon, or another polygon.

  In the first embodiment, the map data 21 is created by integrally creating a number of layers created in advance by the map producer and a layer having the business information of the customer of the service provider. Although configured, it need not be. That is, the map data 21 is managed by being separated into basic map data composed of a number of layers created in advance by a map producer and facility map data composed of layers having customer business information. It may be.

Embodiment 2

  FIG. 11 is a table created to explain the determination table 23 ′ of the second embodiment. As shown in FIG. 11, the second embodiment is an effective example in the case where only a combination of common unnecessary layer names is defined for all of one or many business layer names. That is, when the determination table 23 ′ is in the situation as shown in FIG. 11, processing for removing unnecessary layers from the outline data 21 (S107 in FIG. 8 and S201 in FIG. 9) as in the first embodiment. And S202), the effective line segment information and the text information corresponding to the unnecessary layers respectively indicated by the unnecessary layer names are removed from the map data 21 in advance and prepared in the recording device 20h. In this way, the processing speed in the server machine 20 can be improved. Therefore, as shown in the configuration diagram of FIG. 12, in the second embodiment, the simple outline data 21 ′ obtained by removing unnecessary layers from each outline data 21 is displayed together with the outline data 21 on the server machine 20. Is prepared in advance in the recording device 20h. In accordance with this, the content of the outline data processing is slightly changed from that of the first embodiment (see FIG. 9). Specifically, as shown in the flowchart of FIG. 13, in S301 after the start of the contour data processing process, the CPU 20a reads the simple contour data 21 ′ corresponding to the processing target contour name from the recording device 20h. Then, the outline processing data processing is finished. Therefore, when preparing the determination table 23 ′ as shown in FIG. 11, the map data processing process is executed in the server machine 20 so that the map is received after receiving a request from the client machine 20. The processing speed until data is returned can be improved as compared with the first embodiment.

Embodiment 3

  The third embodiment has the same configuration as that of the first embodiment except that the equipment management table 26 is added to the server machine 20 and the contents of the map data distribution process are slightly different. Therefore, only differences from the first embodiment will be described below.

  FIG. 14 is a configuration diagram schematically illustrating the server machine 20 according to the third embodiment. As is clear from comparison between FIG. 14 and FIG. 3 used in the description of the first embodiment, a facility management table 26 is added to the recording device 20h of the server machine 20 of the third embodiment. . This facility management table 26 is a table in which the number of facilities necessary for the business of the service provider, which is a customer of the service provider, is recorded in each map box. Every). FIG. 15 is a table created for explaining the data structure of the equipment management table 26. As shown in FIG. 15, the equipment management table 26 creates a record composed of item fields of “map name”, “number of power poles”, “number of wires”, and “number of switches” for each map. Is made up by. The name of the map is recorded in the “map name”, and the “number of utility poles”, “number of wires”, and “number of switches” are expressed in the map by a business layer having business information of a certain contractor. The number of utility poles, electric wires, and switches that are installed is recorded. Note that the number recorded here is an integer of 0 or more.

  In addition, a map data distribution program 25 ′ whose contents are slightly changed from the map data distribution program 25 of the first embodiment is recorded in the recording device 20h of the server machine 20 of the third embodiment. . FIG. 16 is a flowchart showing the contents of the map data distribution process of the third embodiment. However, the steps S401, S402 and S407 to S410 in FIG. 16 are the same as the steps S101, S102 and S107 to S110 in FIG. 8 used in the description of the first embodiment. Therefore, these steps will not be described below.

  In S403 of FIG. 16, the CPU 20a specifies the first map name among several map names specified in S402 as a processing target.

  In the next S404, the CPU 20a refers to the map management table 22 in the recording device 20h, and reads out the map data 21 corresponding to the processing target map name from the recording device 20h.

  In next step S405, the CPU 20a reads out a record including the processing target map name from the equipment management table 26 in the recording device 20h.

  In the next S406, the CPU 20a determines whether or not “0” is included in the record read in S405. If no “0” is included in this record, the CPU 20a includes line segment information corresponding to all business layer names in the map data 21. Assuming that the outline data 21 should be transmitted to the client machine 10 as it is, the process proceeds to S408. On the other hand, if at least one “0” is included in the record, the CPU 20a does not have line segment information corresponding to at least one business layer name in the map data 21. Since there is a possibility that an unnecessary layer exists in 21, the process proceeds to S407.

  In the third embodiment, whether or not there is a business layer in the map data 21 is determined by checking the equipment management table 26 in such map data distribution processing. For this reason, the processing speed from receiving a request from the client machine 20 to returning the map data is slightly improved rather than searching for the business layer from the map data 21 as in the first embodiment. Is done.

Embodiment 4

  The fourth embodiment has the same configuration as that of the first embodiment, except that a distance table 27 is added to the server machine 20 and the contents of the map data processing are slightly different. Therefore, only differences from the first embodiment will be described below.

  FIG. 17 is a configuration diagram schematically illustrating the server machine 20 according to the fourth embodiment. As is apparent from a comparison between FIG. 17 and FIG. 3 used in the description of the first embodiment, a distance table 27 is added to the recording device 20h of the server machine 20 of the fourth embodiment. FIG. 18 is a table created for explaining the data structure of the distance table 27. As shown in FIG. 18, the distance table 27 is configured by creating only one record having both item columns of “distance from vertical boundary line” and “distance from horizontal boundary line”. Has been.

  In “distance from vertical boundary line” and “distance from horizontal boundary line”, predetermined distances in the Cartesian coordinate system defined for the entire map are recorded. Specifically, as shown by the rectangular broken line in the explanatory diagram of FIG. 19, the predetermined distance is eight adjacent maps (figure 1) adjacent to the figure (figure A) to be processed. ˜8) is a distance from the boundary line with the processing target figure outline to a certain position inward. This distance is calculated when the equipment necessary for the business (for example, utility poles A and B in FIG. 10) does not exist in the map to be processed (when there is no business layer). When there is equipment necessary for business in the neighborhood, it is defined so that unnecessary layers are not deleted from the map to be processed. By defining such a distance, it is no longer necessary to delete line segment information and text information corresponding to an unnecessary layer from the map data 21 just because there is no equipment necessary for the work. The identification object indicated by the unnecessary layer can be left in the map box when it exists in the neighborhood. As a result, business convenience is achieved.

  In the fourth embodiment, in order to use this distance table 27, the contents of the outline data processing are slightly changed from those in the first embodiment (see FIG. 9). 20 and 21 are flowcharts showing the contents of the outline data processing according to the fourth embodiment.

  In the first step S501 after the start of the map data processing, the CPU 20a reads a record as distance information from the distance table 27 in the recording device 20h.

  In next step S502, the CPU 20a reads all business layer names from the determination table 25 in the recording device 20h.

  In next step S503, the CPU 20a specifies the first business layer name as a processing target among the several business layer names read in S502.

  In next step S504, the CPU 20a specifies the first adjacent map as the processing target among the adjacent maps (see FIG. 19) adjacent to the map of the processing target map name.

  In next step S505, the CPU 20a reads out the map data 21 of the processing target adjacent map from the recording device 20h.

  In the next step S506, the CPU 20a identifies a rectangular area from the boundary line with the processing target outline in the processing target adjacent outline to the distance indicated by the distance information as the adjacent area.

  In the next S507, the CPU 20a determines whether or not the line segment information of the equipment corresponding to the processing target business layer name exists in the adjacent area specified in S506 based on the map data 21 read in S505. Is determined. If the line segment information of the facility does not exist in the adjacent area, the CPU 20a advances the process to S508.

  In S508, the CPU 20a determines whether there is an unprocessed adjacent map. If an unprocessed adjacent map exists, the CPU 20a advances the process to step S509.

  In S509, the CPU 20a specifies the next adjacent map as an object to be processed among the unprocessed adjacent maps, and returns the process to S505.

  If there is no unprocessed adjacent map during execution of the processing loop of S505 to S509, the CPU 20a branches the process from S508 to S510. If there is an adjacent map where equipment line segment information exists in the adjacent area before there is no unprocessed adjacent map, the CPU 20a branches the process from S507 to S511. Let

  In S510, the CPU 20a reads out the unnecessary layer name corresponding to the processing target business layer name from the determination table 25 in the recording device 20h, and advances the process to S511.

  In S511, the CPU 20a determines whether or not an unprocessed business layer name exists. If an unprocessed business layer name exists, the CPU 20a advances the process to S512.

  In S512, the CPU 20a identifies the next business layer name among the unprocessed business layer names as a processing target, and returns the process to S504.

  If there is no unprocessed business layer name during the execution of the processing loop of S504 to S512, the CPU 20a branches the process from S511 to S513.

  In S513, the CPU 20a determines whether or not an unnecessary layer name has been read up to this point. If the unnecessary layer name has not been read, the CPU 20a ends the map data processing process, and if the unnecessary layer name has been read, the process proceeds to S514.

  In S514, the CPU 20a corresponds to each unnecessary layer name when the map data 21 of the processing target map read in S505 has line segment information corresponding to each unnecessary layer name that has been read. All the line segment information and text information are deleted from the map data 21 and the map data processing process is terminated.

  Since the map data processing as described above is executed, the computer network system of the fourth embodiment has the following effects. That is, in the first embodiment, whether or not an unnecessary layer is to be removed from the outline data 21 is simply determined based on whether or not the outline layer 21 has a business layer (S106 in FIG. 8). However, when equipment necessary for business exists near the edge of the map, it may be better not to delete the unnecessary layer in the map adjacent to the end. Therefore, in the fourth embodiment, if there is equipment necessary for business in a certain area (adjacent area) in the adjacent map adjacent to the processing target map, the processing target map The unnecessary data is not removed from the outline data (S507 in FIG. 20; YES), and the outline data 21 is transmitted to the web client machine 10 as it is. As a result, the time until the web client machine 10 such as a portable information terminal with a limited communication speed or processing speed displays a map is not as short as the first embodiment, but is necessary for business. An identification object such as a prospective building is surely represented on the map. Accordingly, a business operator who performs business using the web client machine 10 can smoothly perform the business by relying on the maps sequentially displayed on the web client machine 10.

(Appendix 1)
For a recording device that records a large number of map data that holds line segment information divided into hierarchies, and correspondence information that defines predetermined first type hierarchies and predetermined second type hierarchies in association with each other. For computers that are connected and connected to a client machine via a network,
When information specifying any map data is sent from the client machine, the map data and the corresponding information are read from the recording device,
In the read outline data, it is determined whether or not line segment information corresponding to the first type of hierarchy defined in the correspondence information exists,
If there is line segment information corresponding to all the first type layers defined in the correspondence information in the read outline data, the client uses the outline data as map data as it is. To the machine,
If there is no line segment information corresponding to any of the first type hierarchies defined in the correspondence information in the read map data, the first type in the correspondence information. A map data providing program that causes the client machine to transmit, as map data, information obtained by removing line segment information corresponding to each of the second type layers associated with the second layer from the map data.

(Appendix 2)
Corresponds to a large number of map data that holds line segment information divided into layers, definition information that defines one or many predetermined first type hierarchies, and one or many predetermined second type hierarchies Connected to a recording device that records a large number of simple outline data generated by removing line segment information from each outline data, and a computer connected to a client machine via a network,
When information specifying any map data is sent from the client machine, the map data and the definition information are read from the recording device,
In the read outline data, it is determined whether or not line segment information corresponding to the first type of hierarchy defined in the definition information exists,
In the read outline data, if there is line segment information corresponding to any of the first type layers defined in the definition information, the outline data is used as map data as it is. Send it to the client machine,
If there is no line segment information corresponding to all the first type layers defined in the definition information in the read outline data, the simplified outline corresponding to the outline data is not present. A map data providing program for reading data from the recording device and transmitting the simple outline data to the client machine as map data.

(Appendix 3)
Defined by a large number of map data that stores line segment information divided into hierarchies, correspondence information that defines a predetermined first type hierarchy and a predetermined second type hierarchy in association with each other, and the correspondence information Connected to a recording apparatus that records a table storing identification information indicating whether or not line segment information corresponding to each first type hierarchy exists in each map data, and via a network. For computers connected to client machines,
When information specifying any map data is sent from the client machine, the map data is read from the recording device,
By referring to the table, it is determined whether or not there is line segment information corresponding to the first type hierarchy defined in the correspondence information in the read outline data,
If there is line segment information corresponding to all the first type layers defined in the correspondence information in the read outline data, the client uses the outline data as map data as it is. To the machine,
If there is no line segment information corresponding to any of the first type layers defined in the correspondence information in the read outline data, the correspondence information is read from the recording device. The map information is obtained by removing line segment information corresponding to each second type hierarchy associated with the first type hierarchy in the correspondence information as map data to the client machine. A map data providing program characterized by causing transmission.

(Appendix 4)
A large number of map data that holds line segment information divided into hierarchies, correspondence information that defines and associates predetermined first type hierarchies with predetermined second type hierarchies, and distance information related to predetermined distances For the computer connected to the recording device and connected to the client machine via the network,
When information specifying any map data is sent from the client machine, the map data and the corresponding information are read from the recording device,
In the read outline data, it is determined whether or not line segment information corresponding to the first type of hierarchy defined in the correspondence information exists,
If there is line segment information corresponding to all the first type layers defined in the correspondence information in the read outline data, the client uses the outline data as map data as it is. To the machine,
If there is no line segment information corresponding to any of the first type defined in the correspondence information in the read outline data, it is adjacent to the outline of the outline data. To read out the map data of all adjacent map boxes and the distance information from the recording device,
Based on the map data of each adjacent map, the first type hierarchy defined in the correspondence information in the area from the border on the map side to the predetermined distance in the adjacent map Determine whether the corresponding line segment information is included,
When line segment information corresponding to all the first type hierarchies defined in the correspondence information is included in the region of any adjacent map, the map data is used as map data. Send it to the client machine as it is,
If the line segment information corresponding to any of the first type hierarchy defined in the correspondence information is not included in the region of all adjacent map figures, the correspondence information Map data provision characterized by causing the client machine to transmit, as map data, information obtained by removing line segment information corresponding to each second type hierarchy associated with one type of hierarchy from the map data program.

(Appendix 5)
The map data providing program according to any one of appendices 1 to 4, wherein the server machine and the client machine transmit and receive data according to HTTP (HyperText Transfer Protocol).

(Appendix 6)
For a recording device that records a large number of map data that holds line segment information divided into hierarchies, and correspondence information that defines predetermined first type hierarchies and predetermined second type hierarchies in association with each other. For computers that are connected and connected to a client machine via a network,
When information specifying any map data is sent from the client machine, the map data and the corresponding information are read from the recording device,
In the read outline data, it is determined whether or not line segment information corresponding to the first type of hierarchy defined in the correspondence information exists,
If there is line segment information corresponding to all the first type layers defined in the correspondence information in the read outline data, the client uses the outline data as map data as it is. To the machine,
If there is no line segment information corresponding to any of the first type hierarchies defined in the correspondence information in the read map data, the first type in the correspondence information. Storing a map data providing program for sending, to the client machine, map data obtained by removing line segment information corresponding to each of the second type of hierarchy associated with each hierarchy from the map data A computer-readable medium.

(Appendix 7)
Corresponds to a large number of map data that holds line segment information divided into layers, definition information that defines one or many predetermined first type hierarchies, and one or many predetermined second type hierarchies Connected to a recording device that records a large number of simple outline data generated by removing line segment information from each outline data, and a computer connected to a client machine via a network,
When information specifying any map data is sent from the client machine, the map data and the definition information are read from the recording device,
In the read outline data, it is determined whether or not line segment information corresponding to the first type of hierarchy defined in the definition information exists,
In the read outline data, if there is line segment information corresponding to any of the first type layers defined in the definition information, the outline data is used as map data as it is. Send it to the client machine,
If there is no line segment information corresponding to all the first type layers defined in the definition information in the read outline data, the simplified outline corresponding to the outline data is not present. A computer readable medium storing a map data providing program for reading data from the recording device and transmitting the simple outline data as map data to the client machine.

(Appendix 8)
Defined by a large number of map data that stores line segment information divided into hierarchies, correspondence information that defines a predetermined first type hierarchy and a predetermined second type hierarchy in association with each other, and the correspondence information Connected to a recording apparatus that records a table storing identification information indicating whether or not line segment information corresponding to each first type hierarchy exists in each map data, and via a network. For computers connected to client machines,
When information specifying any map data is sent from the client machine, the map data is read from the recording device,
By referring to the table, it is determined whether or not there is line segment information corresponding to the first type hierarchy defined in the correspondence information in the read outline data,
If there is line segment information corresponding to all the first type layers defined in the correspondence information in the read outline data, the client uses the outline data as map data as it is. To the machine,
If there is no line segment information corresponding to any of the first type layers defined in the correspondence information in the read outline data, the correspondence information is read from the recording device. The map information is obtained by removing line segment information corresponding to each second type hierarchy associated with the first type hierarchy in the correspondence information as map data to the client machine. A computer-readable medium storing a map data providing program to be transmitted.

(Appendix 9)
A large number of map data that holds line segment information divided into hierarchies, correspondence information that defines and associates predetermined first type hierarchies with predetermined second type hierarchies, and distance information related to predetermined distances For the computer connected to the recording device and connected to the client machine via the network,
When information specifying any map data is sent from the client machine, the map data and the corresponding information are read from the recording device,
In the read outline data, it is determined whether or not line segment information corresponding to the first type of hierarchy defined in the correspondence information exists,
If there is line segment information corresponding to all the first type layers defined in the correspondence information in the read outline data, the client uses the outline data as map data as it is. To the machine,
If there is no line segment information corresponding to any of the first type defined in the correspondence information in the read outline data, it is adjacent to the outline of the outline data. To read out the map data of all adjacent map boxes and the distance information from the recording device,
Based on the map data of each adjacent map, the first type hierarchy defined in the correspondence information in the area from the border on the map side to the predetermined distance in the adjacent map Determine whether the corresponding line segment information is included,
When line segment information corresponding to all the first type hierarchies defined in the correspondence information is included in the region of any adjacent map, the map data is used as map data. Send it to the client machine as it is,
If the line segment information corresponding to any of the first type hierarchy defined in the correspondence information is not included in the region of all adjacent map figures, the correspondence information Stored a map data providing program that causes the client machine to transmit, as map data, information obtained by removing line segment information corresponding to each second type hierarchy associated with one type of hierarchy from the map data A computer-readable medium characterized by:

(Appendix 10)
In a computer network where a client machine is connected to a server machine via a network,
For a recording device connected to the server machine,
A large number of map data that holds line segment information divided into layers, and correspondence information that defines and defines a predetermined first type hierarchy and a predetermined second type hierarchy are recorded,
The server machine is
When information specifying any of the map data is sent from the client machine, the map data and the correspondence information are read from the recording device and defined in the correspondence information. It is determined whether line segment information corresponding to one kind of hierarchy exists in the map data,
If line segment information corresponding to all the first type layers defined in the correspondence information exists in the map data, the map data is directly used as map data to the client machine. Send
If line segment information corresponding to any of the first type hierarchy defined in the correspondence information does not exist in the map data, the first type hierarchy in the correspondence information A map data providing method comprising: transmitting, as map data, information obtained by removing line segment information corresponding to each second type hierarchy associated with the map data to the client machine.

(Appendix 11)
In a computer network where a client machine is connected to a server machine via a network,
For a recording device connected to the server machine,
Corresponds to a large number of map data that holds line segment information divided into layers, definition information that defines one or many predetermined first type hierarchies, and one or many predetermined second type hierarchies A large number of simple outline data generated by removing line segment information to be removed from each outline data,
The server machine is
When information specifying any map data is sent from the client machine, the map data and the definition information are read from the recording device and defined in the definition information. It is determined whether line segment information corresponding to one kind of hierarchy exists in the map data,
If line segment information corresponding to any one of the first type layers defined in the definition information exists in the map data, the map data is used as the map data as it is in the client machine. Send to
When the line segment information corresponding to all the first type hierarchies defined in the definition information does not exist in the outline data, the simplified outline data corresponding to the outline data is displayed. A map data providing method comprising: reading out from the recording device and transmitting the simple outline data as map data to the client machine.

(Appendix 12)
In a computer network where a client machine is connected to a server machine via a network,
For a recording device connected to the server machine,
Defined by a large number of map data that stores line segment information divided into hierarchies, correspondence information that defines a predetermined first type hierarchy and a predetermined second type hierarchy in association with each other, and the correspondence information A table storing identification information indicating whether or not line segment information corresponding to each of the first type of hierarchies is present in each map data;
The server machine is
When information specifying any map data is sent from the client machine, the map data is defined by the correspondence information by reading the map data from the recording device and referring to the table. Determining whether or not line segment information corresponding to the first type of hierarchy exists in the map data,
If line segment information corresponding to all the first type layers defined in the correspondence information exists in the map data, the map data is directly used as map data to the client machine. Send
When the line segment information corresponding to any of the first type hierarchy defined in the correspondence information does not exist in the map data, the correspondence information is read from the recording device, Sending, as map data, to the client machine, the map information obtained by removing the line segment information corresponding to each second type hierarchy associated with the first type hierarchy in the correspondence information. A method for providing map data.

(Appendix 13)
In a computer network where a client machine is connected to a server machine via a network,
For a recording device connected to the server machine,
A large number of map data that holds line segment information divided into hierarchies, correspondence information that defines and associates predetermined first type hierarchies with predetermined second type hierarchies, and distance information related to predetermined distances Record it,
The server machine is
When information specifying any of the map data is sent from the client machine, the map data and the correspondence information are read from the recording device and defined in the correspondence information. It is determined whether line segment information corresponding to one kind of hierarchy exists in the map data,
If line segment information corresponding to all the first type layers defined in the correspondence information exists in the map data, the map data is directly used as map data to the client machine. Send
If the line segment information corresponding to any one of the first type layers defined in the correspondence information does not exist in the map data, all the lines adjacent to the map data of the map data are displayed. Read out the map data of the adjacent map and the distance information from the recording device, and based on the map data of each adjacent map, from the border line on the map side in the adjacent map to the predetermined distance It is determined whether or not line segment information corresponding to the first type hierarchy defined in the correspondence information is included in the area,
When line segment information corresponding to all the first type hierarchies defined in the correspondence information is included in the region of any adjacent map, the map data is used as map data. Sent as it is to the client machine,
If the line segment information corresponding to any of the first type hierarchy defined in the correspondence information is not included in the region of all adjacent map figures, the correspondence information Map data providing, wherein map data obtained by removing line segment information corresponding to each second type of hierarchy associated with one type of hierarchy is sent to the client machine as map data Method.

(Appendix 14)
14. The map data providing method according to any one of appendices 10 to 13, wherein the server machine and the client machine perform data transmission / reception according to HTTP (HyperText Transfer Protocol).

(Appendix 15)
When a client connected to a server machine via a network receives map data having a lot of line segment information from the server machine, the map display system displays a map based on the map data,
A recording device connected to the server machine,
A large number of map data that holds line segment information divided into hierarchies, and correspondence information that defines and defines predetermined first type hierarchies and predetermined second type hierarchies, are recorded,
The server machine is
When information specifying any of the map data is sent from the client machine, the map data and the correspondence information are read from the recording device and defined in the correspondence information. It is determined whether line segment information corresponding to one kind of hierarchy exists in the map data,
If line segment information corresponding to all the first type layers defined in the correspondence information exists in the map data, the map data is directly used as map data to the client machine. Send
If line segment information corresponding to any of the first type hierarchy defined in the correspondence information does not exist in the map data, the first type hierarchy in the correspondence information A map display system that transmits information obtained by removing line segment information corresponding to each of the second type of hierarchy associated with the map data from the map data to the client machine as map data.

(Appendix 16)
When a client connected to a server machine via a network receives map data having a lot of line segment information from the server machine, the map display system displays a map based on the map data,
A recording device connected to the server machine,
Corresponds to a large number of map data that holds line segment information divided into layers, definition information that defines one or many predetermined first type hierarchies, and one or many predetermined second type hierarchies Record a large number of simple outline data generated by removing line segment information from each outline data,
The server machine is
When information specifying any map data is sent from the client machine, the map data and the definition information are read from the recording device and defined in the definition information. It is determined whether line segment information corresponding to one kind of hierarchy exists in the map data,
If line segment information corresponding to any one of the first type layers defined in the definition information exists in the map data, the map data is used as the map data as it is in the client machine. Send to
When the line segment information corresponding to all the first type hierarchies defined in the definition information does not exist in the outline data, the simplified outline data corresponding to the outline data is displayed. A map display system which reads out from the recording device and transmits the simple outline data as map data to the client machine.

(Appendix 17)
When a client connected to a server machine via a network receives map data having a lot of line segment information from the server machine, the map display system displays a map based on the map data,
A recording device connected to the server machine,
Defined by a large number of map data that stores line segment information divided into hierarchies, correspondence information that defines a predetermined first type hierarchy and a predetermined second type hierarchy in association with each other, and the correspondence information A table storing identification information indicating whether or not line segment information corresponding to each of the first type of hierarchies is present in each map data;
The server machine is
When information specifying any map data is sent from the client machine, the map data is defined by the correspondence information by reading the map data from the recording device and referring to the table. Determining whether or not line segment information corresponding to the first type of hierarchy exists in the outline data;
If line segment information corresponding to all the first type layers defined in the correspondence information exists in the map data, the map data is directly used as map data to the client machine. Send
When the line segment information corresponding to any of the first type hierarchy defined in the correspondence information does not exist in the map data, the correspondence information is read from the recording device, Sending, as map data, to the client machine, the map information obtained by removing the line segment information corresponding to each second type hierarchy associated with the first type hierarchy in the correspondence information. A map display system characterized by

(Appendix 18)
When a client connected to a server machine via a network receives map data having a lot of line segment information from the server machine, the map display system displays a map based on the map data,
A recording device connected to the server machine,
A large number of map data that holds line segment information divided into hierarchies, correspondence information that defines and associates predetermined first type hierarchies with predetermined second type hierarchies, and distance information related to predetermined distances Record,
The server machine is
When information specifying any of the map data is sent from the client machine, the map data and the correspondence information are read from the recording device and defined in the correspondence information. It is determined whether line segment information corresponding to one kind of hierarchy exists in the map data,
If line segment information corresponding to all the first type layers defined in the correspondence information exists in the map data, the map data is directly used as map data to the client machine. Send
If the line segment information corresponding to any one of the first type layers defined in the correspondence information does not exist in the map data, all the lines adjacent to the map data of the map data are displayed. Read out the map data of the adjacent map and the distance information from the recording device, and based on the map data of each adjacent map, from the border line on the map side in the adjacent map to the predetermined distance It is determined whether or not line segment information corresponding to the first type hierarchy defined in the correspondence information is included in the area,
When line segment information corresponding to all the first type hierarchies defined in the correspondence information is included in the region of any adjacent map, the map data is used as map data. Sent as it is to the client machine,
If the line segment information corresponding to any of the first type hierarchy defined in the correspondence information is not included in the region of all adjacent map figures, the correspondence information A map display system that transmits information obtained by removing line segment information corresponding to each second type of hierarchy associated with one type of hierarchy from the map data to the client machine as map data .

(Appendix 19)
The map display system according to any one of appendices 15 to 18, wherein the server machine and the client machine transmit and receive data according to HTTP (HyperText Transfer Protocol).

Configuration diagram schematically showing the first embodiment Configuration diagram schematically showing the client machine Configuration diagram schematically showing the server machine A table created to explain the data structure of map data Table created to explain the data structure of the map box management table Explanatory drawing for explaining the coordinates of the four corners of the map on the Cartesian coordinate system Table created to explain the data structure of the judgment table Flow chart showing the contents of map data distribution processing Flow chart showing contents of map data processing Sample screen showing a map before and after removing unnecessary layers Table created to explain the data structure of the judgment table The block diagram which shows schematically the server machine of 2nd Embodiment Flow chart showing contents of map data processing The block diagram which shows roughly the server machine of 3rd Embodiment Table created to explain the data structure of the equipment management table Flow chart showing the contents of map data distribution processing The block diagram which shows schematically the server machine of 4th Embodiment A table created to explain the data structure of the distance table Explanatory drawing for demonstrating the area set around the attention map Flow chart showing contents of map data processing Flow chart showing contents of map data processing

Explanation of symbols

10 Client machine 10a CPU
10b RAM
10c Display device 10d Input device 10e Communication control device 10f Recording device 11 Web browser 12 Map program 20 Server machine 20a CPU
20b RAM
20c Display device 20d Input device 20e Communication control device 20f FDD
20g CDD
20h Recording device 21 Map data 21 ′ Simple map data 22 Map data management table 23 Judgment table 23 ′ Judgment table 24 HTTP server program 25 Map data distribution program 26 Equipment management table 27 Distance table

Claims (3)

A map data providing method in which a server machine transmits map data for each predetermined section stored in a storage device to the client machine based on a request from a client machine on a network,
The server machine is
Identifying map data to be transmitted based on the request received from the client machine;
A first determination step of determining whether or not first identification object information for displaying a predetermined first identification object exists in the map data to be transmitted identified in the identifying step;
If it is determined in the first determination step that the first identification object information does not exist, it is adjacent to the section of the map data to be transmitted based on information defining a predetermined area in the adjacent section. A second determination step of determining whether or not the first identification object information located in the predetermined area exists in the map data of the section to be;
When it is determined in the second determination step that the first identification object information exists, the map data to be transmitted is transmitted to the client machine as it is, and in the second determination step, the first identification information is transmitted. When it is determined that there is no identification object information, the first identification object is referred to by referring to the determination table that defines the first identification object and the predetermined second identification object in association with each other. The corresponding second identification object is specified, second identification object information for displaying the specified second identification object is removed from the map data to be transmitted, and the second identification object information is Transmitting the removed map data to the client machine;
The map data provision method characterized by performing. The map according to claim 1, wherein the determination table defines, for each of a plurality of first identification objects, a second identification object corresponding to the first identification object in association with each other. Data provision method. A map data providing program for causing a server machine to function so as to transmit map data for each predetermined section stored in a storage device to the client machine based on a request from a client machine on a network,
The server machine,
Means for identifying map data to be transmitted based on the request received from the client machine;
First discriminating means for discriminating whether or not there is first discriminating object information for displaying a predetermined first discriminating object in the transmission target map data identified by the identifying unit;
Adjacent to the section of the map data to be transmitted based on the information defining the predetermined area in the adjacent section when it is determined by the first determining means that the first identification object information does not exist Second discriminating means for discriminating whether or not the first identification object information located in the predetermined area exists in the map data of the section to be
When the second discriminating means discriminates that the first identification object information exists, the map data to be transmitted is transmitted to the client machine as it is, and the second discriminating means transmits the first identification information. When it is determined that there is no identification object information, the first identification object is referred to by referring to the determination table that defines the first identification object and the predetermined second identification object in association with each other. The corresponding second identification object is specified, second identification object information for displaying the specified second identification object is removed from the map data to be transmitted, and the second identification object information is Transmitting means for transmitting the removed map data to the client machine;
Map data providing program characterized by functioning.