KR100671789B1 - Data transmission and data synchronization method between spatial data in wired and wireless distributed environment, and distributed spatial data synchronization system for implementing the method - Google Patents

Abstract

The present invention relates to a method for data transmission and data synchronization between spatial data in a wired / wireless distributed environment, and a synchronization system using the method. The method for synchronizing spatial data according to the present invention is based on which spatial database is modified. Recognizing the changed data among the spatial data, extracting the recognized changed spatial data through a standard query rather than a specific application program interface, converting the recognized changed spatial data into a standard synchronization protocol language, and Transmitting the converted change spatial data to the other spatial database, and reflecting the transmitted change spatial data to the other spatial database.

Geographic information, spatial data, data backup, synchronization, standard synchronization

Description

Method for synchronizing and transmitting data between spatial data in wired / wireless distributed environment, and for implementing the method {Method for Synchronizing and Transmitting Data Between Distributed Spatial Data and System therefor}

1 is a structural diagram of a synchronization system between distributed spatial data according to the present invention;

2 is a flowchart in which data synchronization is performed between distributed spatial data according to the present invention.

3 is a flowchart of a data synchronization method between distributed spatial data according to the present invention;

4 is a flowchart of a data synchronization method between distributed spatial data according to another embodiment of the present invention.

5 is a flowchart of a data synchronization method between distributed spatial data according to another embodiment of the present invention.

Figure 6 is a block diagram of a data warehouse using a data synchronization method and synchronization system between distributed spatial data according to the present invention.

The present invention relates to a method of synchronizing spatial data between distributed spatial data and to a synchronization system between spatial data using such a method, and more particularly, to a method and a system for allowing a large amount of spatial data to be synchronized securely and quickly.

In recent years, with the spread of the Internet, various services using the Geographic Information System have been widely spread, and at the national level, the government is actively introducing the geographic information system to integrate and manage the geographic information of the country.

Such geospatial data, so-called spatial data, differs from general data due to the enormous capacity of the capacity and the complexity of the relationship between each data, and the structure in which such geographic information is stored also differs from the general database.

Currently, a commercially available database for geographic information incorporates a so-called GIS engine into a general general database. Popular GS engines include ArcSDE of ESRI in the US and Zeus of Korea Telecom Data.

GIS data is different from general database in terms of its characteristics, and sometimes exists as a file database with a special structure.

The spatial database referred to herein refers to both the above-described database using ArcSDE for RDB (Relation Database), a Zeus of OODB (Object Oriented DataBase) structure, and a file database having its own structure in the form of a file.

Since the spatial data recorded in the GS database uses its own closed structure, there is no general database synchronization method when synchronizing spatial data with spatial data used by other systems. Therefore, synchronization and replication between data is not practical even between the same databases that are distributed or used for various purposes. This problem causes national / local governments / private institutions to spend enormous human management costs to manage vast amounts of geographic information and maintain integrity between databases. This is especially true if the system or database is heterogeneous or if the storage format is not a database but a file.

In building a data warehouse in a distributed environment, it is necessary to add spatial elements to provide more accurate and visible information.

In addition, as wireless communication develops, synchronization of spatial / non-spatial data of wireless terminals is required to provide more accurate information.

It is an object of the present invention to solve such problems of the prior art, and in particular, to provide a spatial data synchronization method for maintaining spatial data synchronized between heterogeneous spatial data and a synchronization system for implementing such synchronization method. The purpose.

It is another object of the present invention to provide a method of synchronizing spatial data to securely and securely achieve the transmission of spatial data for synchronization.

It is still another object of the present invention to provide a method for enabling spatial data generalization technology to be utilized in accordance with the purpose of spatial data when a large database in a decentralized environment is to be used for policy information such as decision making. To provide a system.

Still another object of the present invention is to provide a method and a system for applying wired / wireless synchronization when a data of a wireless terminal embedded based on changed spatial data is to be synchronized with latest data.

In order to achieve the object of the present invention described above, the spatial data synchronization method of the present invention, in the method of synchronizing data between distributed spatial data, includes: (1) recognizing changed data among any one of the spatial data modifications of the spatial data; (2) extracting the recognized change spatial data using a standard query; (3) converting the extracted change spatial data into a standard synchronization protocol language; 4) transmitting the transformed changed spatial data to the other spatial data system, (5) applying the spatial data generalization according to the purpose of the other, and (6) the transmission Reflecting the changed change spatial data to the other spatial database.

According to this method, both of the spatial data of one spatial database are recognized and converted into a standard synchronization protocol language, which is transferred to the other spatial database and reflected in the other spatial database. Synchronization is possible even if the spatial database of different databases is different. In addition, since all the spatial data is not transmitted after the change, only the changed spatial data is extracted and transmitted, and thus the transmission time may be significantly reduced.

In applying the changed data to the other spatial database, the same data can be maintained by synchronizing the data itself according to the purpose of use, or the large data can be effectively used by using the spatial data generalization technology.

Preferably, the standard synchronization protocol language is Synchronization Markup Language (SyncML). This can enable wired / wireless synchronization.

On the other hand, the step of extracting the changed spatial data, it is preferable to use a standard query statement in order to use the standardized agreement between homogeneous / heterogeneous spatial engine.

In order to receive the changed spatial data converted in the form of SYNMEL and reflect it to the other spatial data system, it is preferable to convert it into a query statement applicable to the other spatial data system.

Recognizing the changed data includes monitoring change data and generating a change log.

In addition, the transmitting of the spatial data converted into a standard synchronization protocol language may be performed by distributing the transmitted spatial data in a predetermined size. In general, the spatial data is very likely to not be synchronized smoothly when a problem such as a failure occurs during transmission due to the large capacity of the spatial data. Therefore, this problem can be prevented by dividing and transmitting the spatial data to be transmitted in a predetermined size, which is defined in consideration of various system elements in advance.

The converting of the data into the standard synchronization protocol language may include change data in a transaction unit.

By converting the spatial data changed in transaction units, even if a failure occurs, the integrity of the spatial data can be guaranteed.

In addition, the method of synchronizing data between the distributed spatial data preferably further comprises the step of compressing the change data converted in the standard synchronization protocol language, according to this method, because the capacity of the spatial data to be transmitted can be reduced This provides an advantage in shortening the time.

The step of reflecting the transmitted changed spatial data to the other spatial data system is preferably a step of processing and reflecting a transaction unit corresponding to the characteristics of the other spatial structure.

In the step of reflecting the transmitted changed spatial data to the other spatial data system, it is preferable to enable the condition processing so that the spatial data generalization technique can be applied according to the use of the other.

The step of reflecting the transmitted changed spatial data in the spatial database on the other side may be processed even if the other side is a wireless terminal.

The step of reflecting the transmitted change space data on the other side may be possible when the other side is a storage device in the form of a file rather than a database.

The system for synchronizing data between distributed spatial data according to the present invention includes (1) change management means for recognizing changed data of either system in which data modification occurs, and (2) using the recognized change spatial data as a standard query statement. Means for extracting the data using the method, (3) conversion means for converting the recognized change data into a standard synchronization protocol language form, and (4) change data converted by the conversion means is transmitted to the other system. Network management means for managing, and (5) synchronization management means for receiving the transmitted change data and processing the change data in accordance with the characteristics of the other system and reflecting the change data to the other spatial system.

According to a preferred embodiment of the present invention, the converting means performs a function of extracting the recognized change data using a standard query statement rather than a specific application program interface (API).

According to a preferred embodiment of the present invention, the conversion means performs a function of converting the recognized change data into a synchronization markup language (SyncML).

The conversion means preferably converts the changed data into a transaction unit.

It is preferable that the conversion means be able to incorporate spatial data generalization techniques in accordance with the purpose of use to the changed data.

In addition, the conversion means is preferably to be able to provide the function without the distinction between wired and wireless in reflecting the changed data.

In addition, the data synchronization system preferably further comprises monitoring means capable of monitoring the status of the management means.

On the other hand, the system can be configured to perform the spatial data generalization function for building the changed spatial data data warehouse.

According to a preferred embodiment of the present invention, the system can perform data synchronization between spatial data and wireless data when the target data exists in the wireless terminal.

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

1 is a block diagram of a system for spatial data synchronization between heterogeneous distributed spatial data according to the present invention.

As shown in Fig. 1, the synchronization system according to the present invention comprises a change management means 1, a conversion means 2, a distributed network management means 3, a synchronization management means 4, and a monitoring means. (5) and the configuration manager 6 are included.

The change management means 1 includes a change monitor 11, a change log generator 12, and a change log 13. The converting means 2 comprises a synchronization manager 21, a transaction manager 22, a message manager 23, a standard synchronization protocol language manager 24, a failure manager 25, and an event manager 26. Include. The synchronization management means 4 comprises a synchronization manager 41, a transaction manager 42, a standard synchronization protocol language manager 43, a message manager 44, an event manager 46, and a data manager 47. It includes.

The monitoring means 5 comprises a synchronization daemon manager 51, a network failure manager 52, a database failure manager 53, other failure managers 54, and a statistics manager 55. The configuration manager 6 includes a synchronization preference manager 61 and a setting validation manager 62.

The change monitor 11 of the change management means 1 detects that the spatial data recorded in the source-side spatial database is changed, and the change log generator 12 changes the log 13 regarding the spatial data in which the change is detected. ) Is recorded.

The converting means 2 converts the changed spatial data detected and recorded by the change management means 1 into a standard synchronization protocol language, for example, SyncML (Syncchronization Markup Language). The following describes an embodiment in which the standard synchronization protocol language is SyncML, but it is obvious that the scope of the present invention is determined by the claims below and is not limited to the specific language. The synchronization manager 21 works in conjunction with the SMB manager 24 to control processing commands related to the SMB, and converts the changed spatial data into a SMB. Here, the synchronization manager 21 finds the changed spatial data, and the sync M manager 24 converts the changed spatial data into the sync M form.

As described above, the transaction manager 22 performs a function of making a transaction unit in changing the spatial data changed in the SYNM type, and the failure manager 25 converts the spatial data changed in the SYNM type. Manage and manage various obstacles that occur.

The event manager 26 manages various events in operating the spatial database.

The distributed network management means 3 monitors and manages communication tasks, such as transmitting the changed spatial data converted into the SYNM form as described above to the synchronization management means 4 of the target-side database through the network 150. . In addition, communication of the monitoring means 5 and the configuration manager 6, which will be described later, is also monitored and managed.

The synchronization management means 4 reflects the changed spatial data thus received in the target side database 200. This reflection process is first performed by converting the changed spatial data received in the SYNM form into a standard query statement that can be accepted by any database.

Each element of the synchronization management means 4 performs the same function as each of the elements of the conversion means 2 described above. However, the data manager 47 decodes and reflects the spatial data in a form suitable for the characteristic according to the type (database or wireless data) of the target database. In addition, when generalization of spatial data is required to build a data warehouse, spatial data generalization is performed.

Generalization work sets each transmitted geographic information by combining generalization operators by type (polygon, point, line, OpenGIS Simple Feature, etc.) and characteristics, and saves them based on the set rules. By the reflection on the target side. Here, generalization operators include simplification, reclassification, collation, object selection, elimination, and aggregation.

The monitoring means 5 comprises a synchronization daemon manager 51, a network failure manager 52, a database failure manager 53, other failure managers 54, and a statistics manager 55. The monitoring means 5 shows the progress of synchronization of the spatial data, and serves to confirm whether the conversion means 2 and / or the synchronization management means 4 are in operation.

The synchronization daemon manager 51 manages the failures of the conversion means 2 and the synchronization management means 4 and allows the user to recognize them. The network failure manager 52 manages whether a network failure between the source-side spatial database 100 and the target-side spatial database 200 occurs and allows a user to recognize the failure. The database failure manager 53 monitors failures of the source-side spatial database 100 and the target-side spatial database 200 so that the user can recognize them. The other fault manager 54 monitors other faults in addition to the aforementioned faults and allows the user to recognize them. The statistical manager 55 can manage various statistical values in the operation of the spatial databases 100 and 200 and provide the statistical data to the user.

The configuration manager 6 includes a synchronization preference manager 61 and a setting validation manager 62.

The synchronization preference manager 61 configures an environment setting for spatial database synchronization, for example, source and target relationship setting, transmission period, data to be transmitted, change spatial data transmission unit through the network 150, whether generalization is applied, or generalization is applied. It is possible to set rules such as city generalization. The setting validity checking manager 62 checks whether the various environment settings set by the user are valid setting values allowed by the system and whether the data is matched by synchronization or by various errors.

2 is a flowchart illustrating data synchronization between distributed spatial data according to the present invention according to the present invention.

As shown in Fig. 2, when the spatial data of the source-side spatial database 100 is changed, the spatial data changed in the SYNM form by the change management means 1 and the conversion means 2 are converted and distributed network management means. By the control of (3), it transmits to the synchronization management means 4 of the target side spatial database 200 via the network 150. FIG. The changed spatial data of the sync-el type received by the synchronization management means 4 is converted into a query applicable to the target-side spatial engine by the spatial engine adapter 250 and reflected in the target-side spatial database 200. .

Since the change spatial data transmitted between the source-side spatial database 100 and the target-side spatial database 200 is a Sync-M type, synchronization is possible regardless of the type, and communication through the network 150 also performs TCP / IP communication. Data communication is convenient because only one TCP / IP port needs to be open for communication between spatial data.

3 is a flowchart illustrating a data synchronization method between spatial data according to an embodiment of the present invention.

First, when the spatial data is changed in the source-side database 100, it is recognized (step S300). The changed spatial data thus recognized is a standard synchronization protocol language, for example, SyncML (Synchronization Markup) in step S310. Language). The change space data converted into the standard synchronization protocol language format is transmitted in step S320. This transfer communication protocol is preferably TCP / IP as described above. In step S330, the data transmitted in step S320 is received and processed according to the characteristics of the target-side spatial database 200. As described above, according to the preferred embodiment of the present invention, the changed spatial data received in the form of SYNC is converted into a standardized query and reflected in the target-side spatial database 200.

When generalization of spatial data is required to build a data warehouse, it is preferable to perform spatial data generalization. In this generalization operation, a generalization operator is set for each type and characteristic of each transmitted geographic information. Based on the rule, the data is stored in the target side by the stored rule. Here, generalization operators include simplification, reclassification, collation, object selection, elimination, and aggregation.

4 is a flowchart illustrating a data synchronization method between spatial data according to another embodiment of the present invention.

The method shown in FIG. 4 is different from the synchronization method shown in FIG. 3 in that the spatial data recognized as changed in the source-side spatial database 100 in step S310 'is converted into a sync-el form for each transaction unit. This transaction-by-transaction conversion provides the effect of maintaining the integrity of data even if a failure occurs in the middle.

In step S330, the received data is processed for each transaction unit because the transaction is converted for each transaction unit.

5 is a flowchart illustrating a data replication method between spatial data according to another embodiment of the present invention.

In the synchronization method shown in FIG. 5, when the amount of change spatial data to be transmitted is enormous, the data to be transmitted is compressed in step S340, and the compressed data is divided and transmitted again by a predetermined size unit. S350)) In this way, even if a failure occurs in the middle of transmission, it is efficient because it is necessary to retransmit from the partition where the transmission is interrupted without having to transmit again from the beginning.

6 is a block diagram of a data warehouse of an overall environment including a spatial data synchronization system according to the present invention.

As shown in Fig. 6, a plurality of local-side database servers 300-1, 300-2, ..., 300-n are connected to the source-side database server 100 by a network. Each of the local side database servers 300-1, 300-2, ..., 300-n is connected to the spatial data editing means and the attribute management means, and preferably the intranets 400-1, 400-2. , ..., 400-n).

In addition, the source-side database server 100 may be able to view the spatial data in the mobile environment by the mobile communication means (80). The source-side database server 100 is also configured to perform metadata management and source-side database management by means connected by the intranet 90. When applying the data to the source-side database server 100 is configured to apply the spatial data generalization function.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the scope of the present invention is determined by the claims below and should not be construed as being limited to the embodiments or drawings described above. It is also apparent that modifications, improvements or modifications apparent to those skilled in the art described in the claims are included in the scope of the present invention.

According to the present invention, since only a part changed in the form of a standard synchronization protocol language can be operated in synchronizing a large amount of spatial data, it can be operated in hardware and software under various environments, and the existing legacy system can be operated as it is and used. It is possible to establish a synchronization environment between spatial data without affecting the current application.

In addition, according to the present invention, not only can one-to-one, N-to-one, bidirectional spatial data synchronization is possible, but also real-time synchronization is possible, and periodical and batch synchronization is also possible.

In addition, the present invention can be utilized as a spatial data backup system in preparation for a failure or natural disaster without putting a load on the system.

Claims (15)

In the data transmission and synchronization method between wired and wireless distributed spatial data, Recognizing the changed data among any one of the spatial data to which the spatial data is modified; Extracting the recognized change spatial data using a standard query statement; Converting the recognized change spatial data into a standard synchronization protocol language on a transaction basis; Dividing the converted change spatial data into a predetermined size and transmitting the converted spatial data to the other spatial database; Applying spatial data generalization to the transmitted changed spatial data according to the use of the other side; Reflecting the transmitted change spatial data to the other spatial database, The step of reflecting the transmitted change spatial data to the other spatial database is a step of reflecting by processing in a transaction unit corresponding to the characteristics of the other database Method of data transmission and synchronization between distributed spatial data. The method of claim 1, wherein the standard synchronization protocol language is a synchronization markup language (SyncML). The method of claim 1 or 2, wherein recognizing the changed data includes monitoring change data to generate a change log. delete delete The method according to claim 1 or 2, further comprising compressing the change data converted into the standard synchronization protocol language. delete In the data transmission and synchronization system between wired and wireless distributed spatial data, Change management means for recognizing the changed data of either data in which the correction of the data occurs; Means for extracting the recognized data using a standard query statement; Conversion means for converting the recognized change data into a standard synchronization protocol language in a transaction unit; Network management means for managing that the change data converted by the conversion means is divided into a predetermined size and transmitted to the other database; A synchronization management means for receiving the transmitted change data and processing the change data in accordance with characteristics of the other data and reflecting the change data to the other data; The synchronization management means processes and reflects the change data in transaction units corresponding to the characteristics of the other database.  Data transmission and synchronization system between distributed spatial data. The system of claim 8, wherein the conversion means converts the recognized change data into a synchronization markup language (SyncML). delete 10. The system of claim 8 or 9, further comprising monitoring means capable of monitoring the status of said management means. 10. The system of claim 8 or 9, comprising means for performing spatial data generalization functions for building modified spatial data for a data warehouse. 10. The system of claim 8 or 9, wherein the converting means performs data synchronization between the spatial data and the wireless data when the target data exists in the wireless terminal. The system of claim 12, wherein the generalization is performed by processing and storing the transmitted data by designating a spatial operator for each type and characteristic. 15. The method of claim 14, wherein the generalization is performed by storing a spatial operator based on a rule based on a type and a characteristic when the change data is reflected on the other data, and performing data transmission between distributed spatial data. Synchronization system.

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