KR20210116971A - Spatial data clearing system based on OpenGIS - Google Patents

Abstract

The present invention relates to an open space distribution system based on a GIS, wherein spatial information and services can be distributed in a shared manner. In order to solve a problem of integration with sharing of spatial information in a distributed environment and to enhance reusability of a development application system, the open space distribution system is componentized on the basis of CORBA implementation specification of an open GIS suitable to support compatibility and interoperability between heterogeneous platforms in the distributed environment. The open space distribution system comprises: a spatial information distribution server which has spatial information on that a client intends to use and information on a person who provides a service and a place where the person exists; a spatial information distribution basic component which is installed in each of a COM-based data provider component, an application component, and a core common component, and provides data and services through mapping with a CORBA-based interface to enable a platform-independent use of spatial information and services provided by each of the components in a distributed environment. The spatial information distribution server and the COM-based data provider component, application component, and core common component are linked by the distributed environment. The client is supplied with spatial information and services from the COM-based data provider component, application component, and core common component by using information provided through the spatial information distribution server.

Description

Open space distribution system based on GIS {Spatial data clearing system based on OpenGIS}

The present invention relates to a geographic information system, and more particularly, to an open geographic information system-based spatial information distribution system.

With the development of information technology, the life cycle of hardware, software such as DBMS and GIS is shortening. Therefore, spatial information should be constructed so that it can be used regardless of the type of GIS engine or spatial DBMS. Accordingly, according to the recent change in the software paradigm, it is being developed as a component that is independent of the operating environment and can be operated individually beyond the limits of existing software, thereby pursuing reusability and efficiency in terms of time and cost of developing application software.

With the National Spatial Data Infrastructure (NSD) construction project, the amount of domestic spatial information continues to increase, creating new added value. potential is increasing. It requires the provision of remote civil service and administrative services using spatial information such as topographic maps, thematic maps, and cadastral maps, while also requiring services of spatial information verified and refined by digital map producers through a clearinghouse. However, spatial information based on a distributed environment is not only vast, but also very complex, and it is difficult to express information in a standardized form because it is used in different S/W or H/W environments.

International Organization for Standardization Technical Committee member (ISO/TC 211), OpenGIS for research on interoperability of spatial information

Consortium (OGC), Federal Geographic Information Standardization Commission (FGDC) in the United States, and European Standardization Commission (CEN) are at the center, and technical standardization of not only metadata but also model proposals and data formats is in progress. In particular, OGC's open GIS proposes an abstract specification based on object technology and an implementation specification in distributed environments such as CORBA and OLE/COM for interoperability of spatial information in a heterogeneous distributed computing environment. Make it available to software developers in the form of a common standard interface. As such, advanced countries are already investing a lot of budget for the efficient distribution and utilization of spatial information produced and managed by individual institutions, and are promoting the installation and utilization of spatial information distribution mechanisms.

Currently, in Korea, the specification of spatial information distribution components following the open GIS standard is clearly presented and

and the need for research and related technologies are not well recognized.

Since most of the GIS-related data and system construction currently being developed operate only on the GIS engine of a specific supplier, a huge cost is required to change the selected geographic information system. Therefore, it is necessary to introduce a technology that can construct spatial information so that it can be used regardless of the type of GIS engine or spatial DBMS. Accordingly, according to the recent change in software paradigm, the reusability of application S/W, reduction of development time, and efficiency in terms of cost are improved through the development of components that are independent of the operating environment and can operate individually beyond the limits of the existing S/W. is raising

Existing geospatial information is constructed in various formats, and geospatial information processing services are implemented with system-dependent data types and interfaces. Moreover, if you want to use spatial information from other places in a distributed environment, you need a technology that supports platform-independent use. In particular, in order to use COM-based spatial information and services in the information distribution system that operates CORBA as a standard distributed environment, additional work is required for interworking CORBA and COM for each information provider.

The technical problem to be achieved by the present invention is to solve the problem of integration with spatial information sharing in a distributed environment and to increase the reusability of the development application system. It aims to provide an open GIS-based spatial information distribution system that can share and distribute componentized spatial information and services based on the CORBA implementation specification of GIS.

According to the present invention, on the premise that different GIS engines are used, componentized spatial information and services are shared based on the CORBA implementation specification of an open GIS suitable for supporting compatibility and interoperability between heterogeneous platforms in a distributed environment. By establishing a spatial information distribution system that enables will be used as

In addition, users who need spatial information want to receive spatial information verified and refined by a spatial information producer through a clearing house. You need information that you can do. In addition, from the producer's point of view, data on spatial information is required to pursue the ease of access and retrieval of the information possessed by the institution. As such, the necessity of metadata and the need to construct efficient data are emerging. By accommodating them, producers of spatial information can easily obtain information about spatial information and access information that meets their needs by accommodating the standards for the format and components of metadata for the information they provide. do.

The open GIS-based spatial information distribution system according to the present invention for solving the above technical problems is a spatial information distribution for using COM-based spatial information and services in an information distribution system that operates CORBA as a standard distributed environment. A system comprising: a spatial information distribution server having information on who provides spatial information and services that a client intends to use, where and where; And it is installed in each of the COM-based data provider component, application component, and core common component, and is mapped with a CORBA-based interface in order to use the spatial information and services provided by each component independently of the platform in a distributed environment. a spatial information distribution basic component that provides data and services through It is characterized in that spatial information and services are provided from the COM-based data provider component, application component, and core common component using the information provided through the information distribution server. In addition, the spatial information distribution server may include: a metadata database for storing spatial information and information on who provides where and where the service is provided; a search component for retrieving information desired by a client in the metadata database; a transmission component for transmitting information desired by the client; and a metadata management component that registers, modifies, and deletes the metadata.

In addition, the spatial information distribution basic component is characterized in that it is connected to the COM-based data provider component, application component, and core common component by an OLE/COM interface.

In addition, the basic spatial information distribution component for the data provider component accesses the data source after authentication for the user's ID and password, generates a result rowset, and uses the generated result rowset in an open geographic information system. It is characterized in that it is converted into CORBA's Simple Feature and transmitted to the client using the transmission component.

In addition, the spatial information distribution basic component is characterized in that it is provided to users of spatial information who want to use spatial information and services provided by the COM-based data provider component, application component, and core common component.

In addition, the spatial information distribution basic component for spatial information users is characterized in that it is classified into an information distribution basic component for users in environments other than OLE/COM and an information distribution basic component for users in an OLE/COM environment.

In addition, the basic information distribution component for users in environments other than OLE/COM operates on platforms other than OLE/COM environments, and people who want to develop systems according to the CORBA implementation specification of open GIS or OLE/COM-based data It is characterized as a component for clients who want to use spatial information provided by the provider or services provided by other components. Hereinafter, the present invention will be described in detail with reference to the drawings.

The present invention proposes a model for enabling the data and services provided by each component to be used independently of the platform in a distributed environment.

1 is a block diagram illustrating an open GIS-based spatial information distribution system according to the present invention. A spatial information distribution server 100, a core common component 110, a data provider component 120, an application component 130, and Information Distribution Basics

It consists of components 140 .

The spatial information distribution server 100 is a metadata database 101 that stores information about where and who provides spatial information and services, and a search component that searches the information desired by the client in the metadata database 101. (104), a transmission component 103 for transmitting information desired by the client, and a metadata management component 102 for registering, modifying, and deleting the metadata.

The Data Provider Component (120), Application Component (130), and Core Common Component (Base Component: 110) are all components developed based on OLE/COM and operating monolithically.

The information distribution basic component 140 is installed in each of the COM-based data provider component 120, the application component 130, and the core common component 110, and provides spatial information and services provided by each component in a distributed environment. Data and services are provided through CORBA-based interface and mapping in order to be used independently of the platform.

And, each component can be used as a stand-alone system, and is a basic component of spatial information distribution.

By installing 140, it can be extended so that anyone can use it even in a distributed environment. 2 shows the structure of a spatial information distribution server.

The server for spatial information distribution has information on who provides the data and services that the end client wants to use, where and where. The spatial information distribution server is largely composed of a metadata database, a search component, a transmission component, and a metadata management component.

As research on information interoperability in a heterogeneous distributed environment started, metadata includes extended information such as location information. In addition, research on standardization and exchange of metadata has been conducted centering on information retrieval systems that require information sharing between different systems, and it is also applied to GIS-related systems. The metadata in the information distribution basic model proposed in the present invention is registered in the metadata database of the spatial information distribution server by the information provider, and consumers who need spatial information and spatial information processing services individually constructed in a heterogeneous distributed environment In order to be provided to users, the location information along with the information required for search is managed by the information storage server.

The spatial information distribution basic component is an essential component for information distribution. The most important function is to provide data and services provided by Microsoft's COM-based data provider component, core common component, and application component independently of the platform in a distributed environment. CORBA-based in order to be able to use

It provides data and services through interfaces and mappings.

Based on what has been mentioned so far, the information distribution component is divided into the information distribution basic component for the data provider component, the information distribution basic component for the core common component, the information distribution basic component for the application component, and an environment other than OLE/COM It can be classified into information distribution basic component for users of OLE/COM environment and information distribution basic component for users of OLE/COM environment.

Geospatial information distribution basic components for data and service providers in OLE/COM environment are classified as follows. ● Geospatial information distribution basic component for data provider component - Geospatial information distribution basic component for Shape Data Provider component - Spatial information distribution basic component for SDE Data Provider component - Geospatial information distribution basic component for Geus Data Provider component - MGE Data Geospatial Information Distribution Basic Component for Provider Component - Geospatial Information Distribution Basic Component for GeoMania Data Provider Component

● Information distribution basic component for core common component ● Information distribution basic component for application component

In the present invention, the spatial information distribution basic component for the data provider component is used by the data provider using the data provider component to provide spatial data. The functions of the spatial information distribution basic component for the data provider component are as follows.

1. Go through the authentication process for the user's ID and password. 2. Access the Data Source and create the result Rowset.

3. Convert the resulting Rowset to OpenGIS CORBA Simple Feature. (COM-CORBA linkage) 4. Transmit the converted Simple Feature using the transmission component.

3 shows a structure and an operation process of an information distribution basic component for a data provider component. In order to access the data source requested by the client, the basic information distribution component for the data provider component first goes through the authentication process for the ID and password received as parameters. One information distribution basic component for data provider component exists for each data provider that provides OLE/DB interface using OGISDataProvider component implemented according to OLE/COM specification of open GIS. Information distribution basic components for each data provider component access each data source using the OLE/DB interface provided by each data provider. In order to access the data source and create the result rowset, the standard interfaces provided by Microsoft's OLE/DB are Data Source Interface, Session Interface, Command Interface, and Rowset Interface. As a result, we get a Rowset object. In this part, the OLE/COM specification of OpenGIS is accepted and implemented.

In order to enable anyone to use COM-based Rowset object independently of the platform in a distributed environment, it is converted into Simple Feature suggested by the CORBA specification of open GIS and provided to the client. A COM-CORBA linkage method is required to convert the generated result Rowset into CORBA's Simple Feature, and the entity to be transmitted to the client is implemented by accepting the OpenGIS CORBA specification.

The converted Simple Feature is transmitted to the client using a transmission component. If the client complies with the standard interface of Simple Feature presented in the CORBA specification of open GIS, the transmitted Simple Feature can be used on any platform.

Each basic component of geospatial information distribution for data providers has different access rights and access methods to the data source, but other than that, they function the same.

Information distribution basic components are also required for users of spatial information who want to use data and services provided by data provider components, application components, and core common components.

Geospatial information distribution basic components for data and service users are classified as follows. ● Information distribution basic component for users in environments other than OLE/COM ● Information distribution basic component for users in OLE/COM environment

Among them, the basic component for spatial information distribution for users in environments other than OLE/COM operates in other platforms, such as Unix, not in OLE/COM environments, It is a basic component of spatial information distribution for clients who want to use spatial information provided by OLE/COM-based data providers or services provided by other components. This spatial information distribution basic component is implemented according to the CORBA implementation specification of open GIS, and anyone can use it as long as it follows the standard CORBA implementation specification of OGC.

4 shows the basic components of spatial information distribution for data users.

The client first searches for information about who provides spatial data and services that they want to use through metadata search. When there is a request from the client, the metadata search component of the information distribution server searches the metadata database and informs the client of the location information of the requested data and information about the data content. The client checks the location of the data to be used by the application and stores the location information so that it can be used in its own application. The client performs operations on spatial data by calling the standard interface provided by the CORBA specification of open GIS, that is, the interface for the Simple Feature of the Open GIS CORBA specification, for the spatial data needed using the stored location information. For the requested Simple Feature, the data provided by the data provider through the spatial information distribution basic component is processed through the transmission component of the spatial information distribution server.

In the application, for data distributed through the information distribution component implemented according to the open GIS standard specification, screen output, enlargement, and reduction, in addition to equal, touches, contains, within, disjoint, crosses, overlaps, You can use spatial operations such as intersects. In other words, the client can perform operations on the spatial data that exist in the remote as if it exists in their local area.

The drawings and the specification are merely illustrative of the present invention, which are used only for the purpose of describing the present invention, and are not used to limit the meaning or scope of the present invention described in the claims. Therefore, it will be understood by those of ordinary skill in the art that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

Claims (4)

In a spatial information distribution system for using COM-based spatial information and services in an information distribution system that operates CORBA as a standard for a basic distributed environment,

a geospatial information distribution server having information on who provides the geospatial information and services that the client intends to use, where and where; and

It is installed in each of the COM-based data provider component, application component, and core common component, and CORBA-based interface and mapping are implemented so that spatial information and services provided by each component can be used independently of the platform in a distributed environment. It includes basic components of spatial information distribution that provide data and services through

The spatial information distribution server and the COM-based data provider component, application component, and core common component are linked by a distributed environment,

The client receives spatial information and services from the COM-based data provider component, application component, and core common component by using the information provided through the spatial information distribution server.

An open GIS-based spatial information distribution system.
According to claim 1, wherein the spatial information distribution server

a metadata database that stores information about where geospatial information and services exist and who provides them;

a search component for retrieving information desired by a client in the metadata database; a transmission component for transmitting information desired by the client; and

An open GIS-based spatial information distribution system, characterized in that it includes a metadata management component that registers, modifies, and deletes the metadata.
The method of claim 1, wherein the spatial information distribution basic component is

An open GIS-based spatial information distribution system, characterized in that the COM-based data provider component, application component, and core common component are connected by an OLE/COM interface.
According to claim 1, wherein the spatial information distribution basic component for the data provider component

After the user ID and password are authenticated, the data source is accessed to generate the result rowset, and the resultant rowset is converted into CORBA's Simple Feature of the open geographic information system and transmitted to the client using the transmission component. An open GIS-based spatial information distribution system characterized by