JP3657822B2 - Spatial data search system, spatial data search method and data management method, and computer-readable recording medium - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a spatial data retrieval system for retrieving spatial data distributed in a network, a spatial data retrieval method, a data management method for managing metadata of a spatial object, and a computer implementing the system or method. The present invention relates to a computer-readable recording medium on which a program for recording is recorded.
[0002]
[Prior art]
As a method of searching for spatial data distributed on the network, the server or metadata that is accessed in advance on the client side is embedded in the program, or the metadata is searched for in the client like a clearing house and the metadata is sent to the client. There are known ways to return only. Specifically, for example, in order to acquire the necessary spatial data on the client side, the metadata about the distributed spatial object is searched, and further, the spatial object is converted from the search condition created by the client based on the metadata. A search request is made and spatial data is acquired.
[0003]
[Problems to be solved by the invention]
Conventionally, in order to search for spatial data distributed on the network, the name of the search target object managed in advance in the text file or the like is read on the client side, and the spatial object is directly searched from the information. Obtaining spatial data. This method can search for a spatial object for which an object name is prepared in advance, but when a new spatial object is added, the object name is added to the spatial object name list managed on the client side. If you do not add it, you cannot search for additional activated space objects. When considering a situation in which spatial objects are distributed innumerably, the conventional method cannot cope with the addition of spatial objects.
[0004]
In addition, when a space object is automatically or manually stopped (inaccessible), the client is not automatically notified of this, so the client is based on the space object name managed in the text file. There is a problem that a search request must always be executed regardless of the presence or absence of a spatial object.
[0005]
In the present invention, in view of the problems of the prior art, even if there is a space object newly added or stopped on the network, the space can be searched without changing the client-side program. An object is to provide a data search system and a spatial data search method. In addition, the present invention provides a spatial data search system and a spatial data search method capable of executing a search only for a spatial object necessary at the time of executing a search, depending on the activation state (accessibility) of the spatial object. The purpose is to do. Another object of the present invention is to provide a computer-readable recording medium recording a program for causing a computer to implement the spatial data search system and the spatial data search method.
Note that the “spatial object” in this specification includes spatial data and processing means for processing the spatial data. The processing means is realized by a program.
[0006]
[Means for Solving the Problems]
To achieve the above object, a spatial data search system according to the present invention stores spatial data in a plurality of spatial objects in a spatial data search system that searches spatial data stored in a plurality of spatial objects distributed on a network. A master metadata file for registering the metadata of the spatial data, a spatial object registration processing means for notifying the activation state of the spatial object (notifying whether the spatial object has become accessible or inaccessible), A master metadata file management method that matches the metadata registered in the master metadata file with the metadata of the spatial data stored in the spatial object that has been notified of being activated. Stepped Receiving a spatial data search request transmitted from the client and transmitting the spatial data obtained by performing the search to the client. The search processing means sets the metadata that matches the search condition as master metadata. Extracting from a file and acquiring spatial data corresponding to the metadata from a spatial object to which the extracted metadata belongs.
[0007]
The spatial data search system according to the present invention is also a spatial data search system for searching for spatial data stored in a plurality of spatial objects distributed on a network. The master metadata file for registering the metadata of the object, the spatial object monitoring processing means for registering the activated spatial object, and the spatial object monitoring processing means are notified of the activation status of the spatial object (whether the spatial object is accessible) The spatial object registration processing means for notifying whether access has become impossible) and the spatial object monitoring processing means are inquired, and the metadata registered in the master metadata file is stored in the activated spatial object. Me Master metadata file management means for matching data, and search processing means for receiving a spatial data search request sent from the client and sending the spatial data obtained by the search to the client. Metadata that matches the conditions is extracted from a master metadata file, and spatial data corresponding to the metadata is acquired from a spatial object to which the extracted metadata belongs.
[0008]
The master metadata file management means periodically inquires the spatial object monitoring processing means, and when the metadata of the spatial object registered in the spatial object monitoring processing means does not exist in the master metadata file, the master metadata file management means Access, perform processing to acquire the metadata accumulated in the spatial object and register it in the master metadata file, and the metadata of the spatial object not registered in the spatial object monitoring processing means exists in the master metadata file In this case, it is possible to configure to delete the metadata from the master metadata file.
[0009]
The space object registration processing means is provided in the space object, and is configured to transmit a new registration message when the space object is activated and to transmit a registration deletion message when the space object shifts to a stopped state. be able to.
[0010]
The spatial data search system according to the present invention also sends a new registration message to a suspended state by sending a spatial data file storing a plurality of spatial data, a metadata file storing the metadata of each spatial data, and when activated. A plurality of spatial objects distributed on the network, and a spatial object that has received a message from the spatial object registration processing means and has transmitted a new registration message. The spatial object monitoring means that unregisters the spatial object that has transmitted the delete message and the spatial object to which the metadata belongs can be understood from the metadata of all the spatial objects registered in the spatial object monitoring means. Master meta registered as Master metadata creation means for creating data files and spatial data search requests from clients, search for metadata that matches the search conditions from the master metadata, and access and respond to the spatial object to which the metadata belongs Search means for acquiring the spatial data to be transmitted and returning the acquired spatial data to the client that has transmitted the search request.
[0011]
A data management method according to the present invention is a data management method for managing master metadata in which metadata of spatial data stored in a plurality of accessible spatial objects distributed and arranged on a network is registered. A step of registering the spatial object that has transmitted the message in the spatial object management table, and deregistering the spatial object that has transmitted the deletion message from the spatial object management table; When the metadata of the spatial object registered in the management table does not exist in the master metadata, the spatial object is accessed, the metadata accumulated in the spatial object is acquired and registered in the master metadata. A step of periodically referring to the spatial object management table and deleting metadata of a spatial object not registered in the spatial object management table in the master metadata when the metadata is present in the master metadata. It is characterized by including.
[0012]
A spatial data search method according to the present invention receives a spatial data search request transmitted from a client in a spatial data search method for searching spatial data stored in a plurality of spatial objects distributed on a network. Searching for master metadata in which metadata of spatial data stored in accessible spatial objects is registered, extracting metadata that matches the search condition, and space to which the extracted metadata belongs It includes a step of accessing an object and acquiring spatial data corresponding to the metadata, and a step of transmitting the acquired spatial data to the client. In this spatial data search method, master metadata can be managed by the data management method described above.
[0013]
A computer-readable recording medium according to the present invention is registered in a spatial object monitoring unit that registers a spatial object that has transmitted a new registration message and unregisters the spatial object that has transmitted a deletion message, and the spatial object monitoring unit. The master metadata creation means for creating a master metadata file that registers the metadata of all the spatial objects that are registered so that the spatial object to which the metadata belongs is received, and receives the spatial data search request from the client, Search for metadata that matches the search conditions from the metadata, access the spatial object to which the metadata belongs, acquire the corresponding spatial data, and return the acquired spatial data to the client that sent the search request Means A program for implementing spatial data search system in the computer that is a record.
[0014]
The computer-readable recording medium according to the present invention also registers a spatial object that has transmitted a new registration message in the spatial object management table, and deregisters the spatial object that has transmitted the deletion message from the spatial object management table. When the spatial object metadata registered periodically in the spatial object management table does not exist in the master metadata, the spatial object is accessed and stored in the spatial object. To acquire the registered metadata in the master metadata and periodically refer to the spatial object management table, and the metadata of the spatial objects not registered in the spatial object management table is mastered. When present in metadata is obtained by recording a program for realizing the master metadata management method and a step of deleting the metadata from the master metadata computer.
[0015]
According to the present invention, the spatial object distributed on the network notifies the spatial object monitoring processing means of its own activation or termination, so that the spatial object that can be accessed at the time of search execution is dynamically determined. can do. Therefore, an unnecessary inquiry is not made to the dormant space object, and the load on the network can be reduced.
[0016]
In addition, the application server collects all the metadata of the spatial data stored in the accessible spatial object and holds it as master metadata, and updates the master metadata in accordance with the activation and termination of the spatial object. When searching for spatial data, the client's inquiry destination is the application server, and the application server uses the master metadata to perform search processing. Search can be performed without being conscious of it, and a variety of spatial data can be provided to the client without changing the client-side program.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 is a conceptual diagram showing an overall configuration of an example of a spatial data search system according to the present invention. This spatial data retrieval system includes an application server 20, a spatial object monitoring server 30, and a plurality of spatial object servers 40a, 40b, 40c,... Connected to the network 10, and the client terminals 50a, 50b, 50c,. 20 is searched for the spatial data in the spatial object servers 40a, 40b, 40c,. In the illustrated example, the space object ABC is stored in the space object server 40a, the space object EFG is stored in the space object server 40b, and the space object XYG is stored in the space object server 40c. Although provided, one spatial object server may include a plurality of spatial objects.
[0018]
FIG. 2 is a functional block diagram showing the functions of the application server, the spatial object monitoring server, and the spatial object server, and their connection relationships. Although only one client terminal 50 and one spatial object server 40 are shown in the figure, there are usually a plurality of client terminals 50 and a connection relationship between a plurality of client terminals or spatial object servers and the application server 20 and the spatial object monitoring server 30 are shown. Is the same. The application server 20, the spatial object monitoring server 30, the spatial object server 40, and the client terminal 50 are all configured by a workstation or a personal computer.
[0019]
The application server 20 includes a spatial data search processing unit 21, a master metadata access processing unit 21, and a master metadata file 23. The application server 20 receives messages from the client terminal 50, and stores the spatial data metadata held by the spatial object 41. A search process for the space object group is performed in response to a search / store process and a search request from the client terminal 50. The spatial object monitoring server 30 includes a spatial object monitoring processing means 31 and a spatial object management table 32, and monitors which spatial object is activated (available) in real time. The spatial object monitoring server 30 may be integrated with the application server 20. That is, the spatial object monitoring processing unit 31 and the spatial object management table 32 may be included in the application server 20.
[0020]
Spatial objects 41 in the spatial object server 40 distributed on the network are respectively a spatial object registration processing unit 42, a metadata access processing unit 43, a database access processing unit 44, and spatial data. File 45 And the metadata file 46, notify the spatial object monitoring server 30 at the time of activation, and search and transmit metadata or spatial data in response to a request from the application server. The client terminal searches and displays the spatial data using the spatial data search system of the present invention.
[0021]
When the spatial object 41 is activated, the spatial object registration processing unit 42 of the spatial object 41 sends a message to the spatial object monitoring processing unit 31 of the spatial object monitoring server 30 that it has been activated (becomes available). When the use of the space object 41 is temporarily stopped for the purpose of updating or maintaining the space data, a deletion request message is transmitted to the space object monitoring processing means 31. When recovery is performed after sending a delete request message and performing maintenance or the like, a message is sent again indicating that it has been activated.
[0022]
The spatial data file 46 of the spatial object 41 stores a large number of spatial data (map data). The metadata file 45 stores metadata representing the configuration information of each spatial data stored in the spatial data file 46. The metadata access processing unit 43 performs processing for searching and transmitting metadata stored in the metadata file 45 in accordance with an instruction from the master metadata access processing unit 22 of the application server 20. Based on the search request issued from the spatial data search processing unit 21 of the application server 20, the database access processing unit 44 searches for spatial data that matches the search request from the spatial data file 46 and transmits it.
[0023]
The spatial object monitoring processing means 31 of the spatial object monitoring server 30 receives the message transmitted from the spatial object registration processing means 42 of the spatial object 41, and dynamically creates the spatial objects distributed on the network. Monitoring. Specifically, when a new registration message is transmitted from the spatial object registration processing means, the identification ID of the spatial object is registered in the spatial object management table 32, and a deletion message is transmitted from the spatial object registration processing means. In this case, a process for deleting the identification ID of the space object from the space object management table 32 is performed, and the list of accessible space objects registered in the space object management table 32 is updated as needed.
[0024]
The spatial data search processing means 21 of the application server 20 receives the search request message from the client terminal 50 and executes search processing on behalf of the client terminal. That is, first, the master metadata access processing means 22 is instructed to acquire metadata matching the search request from the master metadata file 23, and then the database access processing means of the spatial object 41 to which the acquired metadata belongs. A search request for spatial data is made to 44. Then, the spatial data transmitted from the database access processing means 44 of the spatial object 41 is transmitted to the client terminal 50 as a search result.
[0025]
The master metadata access processing means of the application server 20 searches for the master metadata file 23 in response to an instruction from the spatial data search processing means 21 and responds to a search request from the client, and master metadata. Processing is performed to keep the contents of the file 23 up to date. For this purpose, the spatial object monitoring processing unit 31 of the spatial object monitoring server 30 is periodically inquired about the identification ID of the spatial object registered in the spatial object management table 32, and the metadata stored in the master metadata 23 file is stored. Is matched with the metadata of the spatial object registered in the spatial object management table 32. In the process, it connects to the metadata access processing means 43 of the necessary space object 41, acquires the metadata from the metadata file 45, and stores it in the master metadata file. If there is a spatial object deleted from the spatial object management table 32, the metadata related to the spatial object is deleted from the master metadata file 23.
[0026]
In this system, when searching for spatial data, the client terminal 50 makes a search request to the application server 20 and receives spatial data as a search result from the application server 20. In this way, the client terminal 50 does not directly search for spatial data on the spatial object 41 itself, but indirectly searches through the application server 20. Accordingly, the client side is not required to have knowledge about the structure of each spatial object, and manages the meta information of each spatial object in the application server 20 and performs a mutual conversion on different data formats based on the meta information. Can also be applied to spatial data of different data formats.
[0027]
The functions of the application server 20, the spatial object monitoring server 30, and the spatial object server 40 described above can be realized in software by programs loaded on the respective servers.
[0028]
FIG. 3 is a diagram showing an example of a record structure of metadata stored in the metadata file 45. As shown in FIG. One entry is one spatial data (graphic element unit) which is the minimum unit in the database of spatial objects. The metadata in this example is handled by the spatial data ID 451 that uniquely identifies the spatial data, the creation system name 452 that is the name of the map system that created the spatial data, the creation date 453 of the spatial data, the creation time 454, and the map system. A geospatial data representation format 455 indicating the data representation format, a spatial coordinate system name 456 indicating the coordinate system of the spatial data, a management range 457 that is a spatial range managed by the spatial data, and a data format that is a data format for each map system 458 includes spatial quality information 459 indicating the accuracy of the map. In addition, the item is treated as one set of the item name and the actual content, and even if metadata is added in the future, by newly setting the item name, it can be flexibly handled without changing the existing metadata configuration I can do it.
[0029]
FIG. 4 is a diagram illustrating a record configuration example of master metadata stored in the application server 20. The configuration of the master metadata record is basically the same as the configuration of the metadata record shown in FIG. 3, but in order to uniquely handle a plurality of distributed spatial objects, each spatial object has which spatial object. A spatial object identification ID 231 indicating whether it belongs to is added. Similarly to the metadata record, one entry is a unit of one spatial data (one graphic element) which is the smallest unit in the database of spatial objects. The other configuration is the same as that of the metadata record, and thus the description is omitted.
[0030]
Figure 5 shows a spatial object Monitoring 4 is a diagram illustrating an example of a space object management table 32 provided in the server 30. FIG. As shown in (a) or (b), the spatial object management table 32 records spatial object identification IDs in a list.
Next, a search process for searching for spatial data from spatial objects arranged in a distributed manner will be described with reference to the flowchart of FIG.
[0031]
As shown in step 11, the spatial data search processing means 21 of the application server 20 operates while waiting for a message such as a search request from the client terminal 50. When a spatial data search request message is received from the client terminal 50 in this state, the process proceeds to step 12 where the spatial data search processing means 21 instructs the master metadata access processing means 22 to execute a master metadata access process described later. Let Next, in step 13, the spatial data search processing means 21 sends the space corresponding to the extracted metadata to the database access processing means 44 of the spatial object 41 to which the metadata searched / extracted from the master metadata belongs. Request data retrieval. In the next step 14, the spatial data search processing means 21 transmits the spatial data transmitted from the database access processing means 44 of the spatial object 41 to the client, and ends the search processing.
[0032]
Next, the above-described master metadata access processing (the processing in step 12 in FIG. 6) performed by the master metadata access processing means 22 will be described with reference to the flowchart in FIG. As shown in step 21, the master metadata access processing means 22 of the application server 20 operates in a state waiting for a message from the spatial data search processing means. When a message is transmitted from the spatial data search processing means 21, the process proceeds to step 22, and if the message content is an end message of the master metadata access processing means, the process ends. If the message is not an end message, the process proceeds to step 23 to determine the message content. If the message is not a metadata search request, the process returns to step 21 and again waits for a message from the spatial data search processing means 21. .
[0033]
If the message transmitted from the spatial data search processing means 21 is a metadata search request, the process proceeds from step 23 to step 24, and the master metadata access processing means 22 is registered in the master metadata file 23. The metadata corresponding to the search request parameter is extracted from the existing metadata. Now, for example, as a search request parameter, a coordinate system (for example, longitude 33 ° 12′00 ″ .00 and latitude 129 ° 15′00 ″ .00) specifying the center position of spatial data and a spatial range (for example, 10 km × 10 km square), the master metadata access processing means 22 refers to the management range 457 of the master metadata record illustrated in FIG. 4 and refers to the spatial data ID “ABC” in the spatial object ID “ABC”. 1 "metadata is extracted. When the metadata search is completed, the process proceeds to step 25, where the master metadata access processing means 22 transmits the searched metadata to the spatial data search processing means 21, and then returns to step 21 to return from the spatial data search processing means 21. Wait for message. It should be noted that the example of the search parameter and the example of the search method using the search parameter described here are merely for the purpose of explanation, and the present invention can be applied to any search parameter assignment method or search method. Can be applied.
[0034]
While the master metadata access processing means 22 of the application server 20 is operating in a state of waiting for a message from the spatial data search processing means 21, the spatial object monitoring processing means of the spatial object monitoring server 30 is periodically generated by a timer interrupt. 31 is inquired to access the metadata of a newly activated spatial object among the spatial objects distributed and arranged in the network, and the content of the master metadata file 23 is updated. Next, the master metadata creation process will be described with reference to the flowchart of FIG.
[0035]
As described with reference to FIG. 7, the master metadata access processing means 22 of the application server 20 operates in a state waiting for a message from the spatial data search processing means 21 (step 21 in FIG. 7). When a timer interruption occurs, the master metadata access processing means 22 moves to the processing of step 31 shown in FIG. 8 and inquires the spatial object monitoring processing means 31 of the spatial object monitoring server 30 and registers it in the spatial object management table 32. Get the spatial object identification ID. In the next steps 32, 33 and 34, the master metadata access processing means 22 checks whether or not the acquired spatial object identification ID already exists in the master metadata file 23. Returning to 32, the next spatial object identification ID is searched from the master metadata file 23.
[0036]
If it is determined in step 34 that the spatial object identification ID acquired in step 31 does not exist in the master metadata file 23, the process proceeds to step 35. In step 35, the master metadata access processing means 22 makes an inquiry to the metadata access processing means 43 of the spatial object 41 by using the spatial object identification ID, and acquires the metadata from the metadata file 45. Then, processing for registering the metadata acquired in the next step 36 in the master metadata file 23 is performed, and the process returns to step 32.
[0037]
This is the case, for example, when the master metadata file 23 is in the state shown in FIG. 4 and the object space management table 32 is in the state shown in FIG. Although the spatial object identification ID “FFF” is registered in the spatial object management table 32 shown in FIG. 5B, the spatial object identification ID “FFF” does not exist in the master metadata file 23 shown in FIG. . Therefore, according to the above processing, the master metadata access processing means 22 queries the metadata access processing means of the spatial object “FFF”, acquires the metadata of the spatial object, and additionally registers it in the master metadata file 23.
[0038]
Next, when all matching of the spatial object identification ID acquired in step 31 and the spatial object identification ID of the metadata registered in the master metadata file 23 is completed, the process proceeds from step 33 to step 37. In step 37, it is determined whether or not a spatial object identification ID other than the spatial object identification ID acquired in step 31 exists in the master metadata file 23. If this determination is “NO”, the process exits the process of FIG. 8 and returns to the message reception waiting state in step 21 of FIG. This is the case, for example, when the space object management table 32 is as shown in FIG. 5A and the master metadata file 23 is as shown in FIG. All the spatial object identification IDs “ABC”, “EFG”, and “XYG” of the metadata registered in the master metadata file 23 are registered in the spatial object management table 32 and are not registered in the spatial object management table 32. There is no spatial object identification ID.
[0039]
If the determination in step 37 is “YES”, that is, if metadata having an identification ID of a spatial object other than the spatial object registered in the spatial object management table 32 exists in the master metadata file 23, the metadata The data is metadata of a spatial object that is currently suspended. Therefore, in order not to perform a useless search, it is necessary to delete the metadata of the spatial data stored in the spatial object whose operation is suspended from the master metadata file 23. Therefore, the process proceeds to step 38, where the master metadata is searched with an ID other than the spatial object identification ID acquired at step 31. Next, the process proceeds to step 39 where the searched metadata is deleted from the master metadata file 23. Thereafter, the process exits from the process in FIG. 8 and returns to the message reception waiting state in step 21 in FIG.
[0040]
Next, the contents of processing in the spatial object monitoring processing means 31 of the spatial object monitoring server 30 will be described with reference to the flowchart of FIG.
As shown in step 41, the spatial object monitoring processing unit 31 of the spatial object monitoring server 30 waits for a message from the master metadata access processing unit 22 of the application server 20 or the spatial object registration processing unit 42 of the spatial object server 40. It is working. If a message to end the space object monitoring processing means 31 is transmitted from the application server 20, the process ends from step 42 as it is.
[0041]
When the message transmitted to the space object monitoring processing means 31 is other than the end message, the process proceeds from step 42 to step 43, and it is determined whether or not the message is a space object identification ID discard message. If the message content is deletion of the space object identification ID, the process proceeds to step 44, where the space object monitoring processing means 31 deletes the specified ID from the space object management table 32, and then proceeds to step 41 to return to the message waiting state. . The discard message for the spatial object identification ID is transmitted from the registration processing unit of the spatial object when the spatial object is suspended for the purpose of updating the spatial data.
[0042]
If the message content is other than the deletion of the space object identification ID, the process proceeds from step 43 to step 45 to determine whether the message is a new registration message of the space object identification ID from the space object registration processing means 42. If the message content is a new registration message of the space object identification ID, the process proceeds to step 46, where the space object monitoring processing means 31 adds the specified ID to the space object management table 32 and then proceeds to step 41 to return to the message waiting state. . For example, when the space object “FFF” is activated when the space object management table has the contents shown in FIG. 5A, and a new registration message is transmitted from the space object registration processing means, the processing of step 46 is performed. Thus, as shown in FIG. 5B, the space object identification ID “FFF” is additionally registered in the space object management table 32.
[0043]
If the message content is other than the new registration of the spatial object identification ID, the process proceeds from step 45 to step 47, where the message is a search for the spatial object identification ID from the master metadata access processing means 22 of the application server 20. Determine whether. If the message content is a search for the space object identification ID, the process proceeds to step 48, where the space object monitoring processing means 31 transmits the contents list of the space object management table 32 to the request destination, and then returns to the message waiting state at step 41. . Also, if all the determinations in steps 43, 45, and 47 are “NO”, the process proceeds to step 41 and returns to the message waiting state.
[0044]
FIG. 10 is a diagram for explaining an example of a search result in the map search system shown in FIGS. 1 and 2. Here, a procedure example of the search process will be described with reference to FIG. 10A and 10B are examples of spatial data searched by the spatial data search processing means 21 of the application server 20, and FIG. 10C is a search displayed on the display screen of the client terminal 50. It is an example of a result.
[0045]
(1) First, a search parameter for spatial data is input from the client terminal 50. Here, in order to search the rectangular range, it is assumed that the longitude and latitude, width and height of the center point of the search range are specified as follows, and a search request is transmitted to the spatial data search processing means 21 of the application server 20. To do.
Center point [33 ° 30'00 ", 129 ° 30'00"]
Width [100 (m)]
Height [80 (m)]
[0046]
(2) The spatial data search processing means 21 of the application server 20 that has received the search request from the client terminal 50 inquires of the master metadata access processing means 22 whether there is metadata that matches the search parameters. Here, the spatial data search processing means 21 also inquires about a search parameter obtained by converting the search parameter into an expression format of another spatial coordinate system so that it can cope with different data formats.
[0047]
(3) The master metadata access processing means 22 searches the master metadata file 23 while paying attention to the management range 457, acquires metadata matching the search parameters, and notifies the spatial data search processing means 21. Here, it is assumed that there are two pieces of metadata whose management range matches the search parameter described above.
[0048]
(4) The spatial data search processing unit 21 that has received metadata matching the search parameter from the master metadata access processing unit 22 belongs to the metadata based on the spatial object identification ID included in the metadata. An inquiry is made to the database access processing means 44 of the spatial object.
[0049]
(5) The database access processing unit 44 of the spatial object that receives the inquiry from the spatial data search processing unit 21 of the application server 20 is requested from the spatial data file 46 based on the spatial data ID included in the metadata. The obtained spatial data is searched and transmitted to the spatial data search processing means 21 of the application server 20.
[0050]
(6) Thus, the spatial data search processing means 21 of the application server 20 receives the spatial data shown in FIG. 10A and the spatial data shown in FIG. 10B from two spatial objects. Here, the spatial data shown in FIG. 10A represents the arrangement of sewer pipes and manholes, and the spatial data shown in FIG. 10B represents the arrangement of roads, general buildings, and utility poles. The spatial data search processing means 21 determines what spatial coordinate system information the searched spatial data is based on the spatial coordinate system name of the spatial data, etc., and synthesizes the plurality of searched spatial data. Thus, the synthesized spatial data (map) is displayed on the client terminal. Spatial data synthesis may be performed on the client terminal side.
[0051]
【The invention's effect】
According to the present invention, since it is possible to dynamically determine whether or not a spatial object distributed on the network is in an activated state, a search is performed only for the spatial object that is in an activated state when performing a search. Network load can be reduced. The system of the present invention is a system in which the application server performs a search process on behalf of the client, and the client can search without being aware of the space object. However, it is possible to provide a wide variety of spatial data to the client without changing the client-side program.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing the overall configuration of an example of a spatial data search system according to the present invention.
FIG. 2 is a functional block diagram showing functions and connection relationships of servers.
FIG. 3 is a configuration diagram of an example of a metadata record.
FIG. 4 is a configuration diagram of an example of a master metadata record.
FIG. 5 is a configuration diagram of an example of a spatial object management table.
FIG. 6 is a flowchart showing an outline of a processing procedure of a spatial data search processing unit.
FIG. 7 is a flowchart showing an outline of processing in the master metadata access processing means.
FIG. 8 is a flowchart showing an overview of master metadata creation processing;
FIG. 9 is a flowchart showing an outline of processing in the space object monitoring processing means.
FIG. 10 is a diagram showing an example of a search result by map search.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Network, 20 ... Application server, 21 ... Spatial data search processing means, 22 ... Master metadata access processing means, 23 ... Master metadata file, 30 ... Spatial object monitoring server, 31 ... Spatial object monitoring processing means, 32 ... Spatial object management table, 40, 40a, 40b, 40c ... Spatial object server, 41 ... Spatial object, 42 ... Spatial object registration processing means, 43 ... Database access processing means, 44 ... Database access processing means, 45 ... Metadata file, 46: Spatial data file, 50, 50a, 50b, 50c ... Client terminal

Claims (5)

In a spatial data search system for searching spatial data stored in a plurality of spatial objects distributed on a network,
A master metadata file for registering metadata of spatial data stored in a plurality of spatial objects, a spatial object monitoring processing means for registering a spatial object in an activated state, and a spatial object activation state in the spatial object monitoring processing means The spatial object registration processing means for notifying the spatial object monitoring processing means, and the metadata registered in the master metadata file matches the metadata of the spatial data stored in the activated spatial object. A master metadata file management means for receiving, and a search processing means for receiving a spatial data search request transmitted from the client and transmitting the spatial data obtained by the search to the client,
The search processing means extracts metadata that matches a search condition from the master metadata file, and acquires spatial data corresponding to the metadata from a spatial object to which the extracted metadata belongs. Spatial data retrieval system. 2. The spatial data search system according to claim 1 , wherein the master metadata file management means periodically inquires the spatial object monitoring processing means, and the metadata of the spatial object registered in the spatial object monitoring processing means is obtained. When the master metadata file does not exist, the spatial object monitoring processing means accesses the spatial object, acquires the metadata stored in the spatial object, and registers the metadata in the master metadata file. When the metadata of a spatial object that is not registered in the master metadata file exists in the master metadata file, a process for deleting the metadata from the master metadata file is performed. 3. The spatial data search system according to claim 1 , wherein the spatial object registration processing means is provided in the spatial object, transmits a new registration message when the spatial object is activated, and the spatial object shifts to a stopped state. A spatial data search system, wherein a registration deletion message is transmitted when the registration is deleted. Registration processing means for transmitting a spatial data file storing a plurality of spatial data, a metadata file storing metadata of each spatial data, and transmitting a new registration message when activated and a deletion message when shifting to a stopped state A plurality of spatial objects distributed on the network, and
Receiving a message from the registration processing means of the spatial object, and registers the spatial object that transmitted the new registration message, the spatial object monitoring processing means for deregistering a space object that has transmitted the deletion message,
Master metadata creating means for creating a master metadata file that is registered so that the spatial object to which the metadata belongs is recognized as metadata of all the spatial objects registered in the spatial object monitoring processing means;
A spatial data search request from a client is received, metadata that matches a search condition is searched from the master metadata, a spatial object to which the metadata belongs is accessed to acquire corresponding spatial data, and the acquired space A spatial data search system comprising: search means for returning data to a client that has transmitted the search request. Spatial object monitoring processing means for registering the spatial object that has transmitted the new registration message and unregistering the spatial object that has transmitted the deletion message;
Master metadata creating means for creating a master metadata file that is registered so that the spatial object to which the metadata belongs is recognized as metadata of all the spatial objects registered in the spatial object monitoring processing means;
A spatial data search request from a client is received, metadata that matches a search condition is searched from the master metadata, a spatial object to which the metadata belongs is accessed to acquire corresponding spatial data, and the acquired space A computer-readable recording medium recording a program for causing a computer to implement a spatial data search system having search means for returning data to a client that has transmitted the search request.

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