KR100466215B1 - Implementation of Web-GIS system for sharing geospatial data - Google Patents

Abstract

The present invention relates to providing geographic information on the web, and the present invention relates to providing geographic information on the web. In particular, when providing geographic information data in a vector format, it is a standard form of geographic information transmission and exchange. (Geography Markup Language: GML) is used to provide interoperability of geographic information on the web, regardless of the type and format of geographic data server, and to provide geographic information in various image formats and vector formats according to user needs. It is about compatible geographic information on the Web that can provide data.

The present invention is intended to support not only interoperability but also interoperability in a web service level for a large amount of geographic information stored in a distributed geographic data server. In addition, it is not a unilateral service of geographic information in an image or vector format, but provides compatible geospatial data on the web that can provide data in a form that meets a user's needs.

Description

Apparatus and method for providing compatible geographical information on the web {Implementation of Web-GIS system for sharing geospatial data}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to providing geographic information on the web. In particular, when providing geographic data in a vector format, geographic markup language (GML), which is a standard format for transmitting and exchanging geographic information, uses geography on the web. Provides compatible geospatial information on the web that can provide information interoperability, and can provide geospatial data in various image formats and vector formats according to the user's needs, regardless of the type and format of the geospatial data server. An apparatus and method are provided.

In general, since the 1990s, the rapid growth of the Internet-based World Wide Web has made it possible for most of the information in various fields to be accessed through the Internet. Among them, the demand for web geographic information system that can grasp and use geographic information quickly and accurately by using the web greatly increased. Web geographic information system has three general characteristics. First, it is not a system that receives data constructed as an interactive system in only one direction, but has a search function and an analysis function like an application program of general geographic information system using the web, and responds to requests repeatedly. do. Second, since it provides a platform irrespective of model or operating system, information can be used anytime and anywhere. Third, it provides a distributed computing environment that can perform the necessary functions by combining data and applications distributed on numerous servers connected to the Internet according to the user's needs. Web geographic information system provides users with the geographic information data set that users of the World Wide Web access to geographic information server. Until now, web geographic information system has been based on vector or geographic information. Only one type of geographic information has been focused on providing it to Web service users. In addition, since each institution or company has its own format, image-based data format or vector data format has a problem that is heterogeneous and complicated and does not interoperate.

Conventional Korean Patent Publication No. 2000-0058609 "Regional Information Providing System and Method Using the Internet" includes various types of regional information provided from a plurality of regional information media, and provides information on national Geographic Information System (GIS) and administrative networks. The present invention relates to a system and a method for providing local information using the Internet, which can be quickly and conveniently searched systematically by enabling simultaneous viewing. A user terminal that accesses the operator computer through the Internet and receives various local information from the operator computer, a local information medium providing various kinds of local information, a database storing local information provided from the local information medium, a local information medium or a database By providing various types of local information to the user terminal through the GIS information and administrative network at the same time, it is composed of the operator computer to provide the information of the administrative network by category. According to the system and method for providing local information using the Internet according to the prior patent, various kinds of local information provided from a plurality of local information media, for example, agencies / groups, consultation / introduction, local news, discount market, discount coupons, Information such as clothing / decoration, food / restaurant, housing / furniture, education, shopping, transportation / tourism, sports / leisure, medical / hygiene and religion / rites can be viewed simultaneously through national GIS information and administrative network. By doing so, there is a very useful effect that can be quickly and conveniently searched systematically.

In addition, Korean Patent Publication No. 1998-066384 "Host Operation Method for Geographic Information Processing in a Client Server Environment" can display and transmit geographic information for each layer in order to effectively handle the requirements of multiple PCs. The present invention relates to a host operation method for processing geographic information in a client server environment.

Prior patents in the host operating method for processing geographic information in a client server environment, the step of verifying the subscriber when the user is connected to the host system, the step of inputting the receipt and history of the user's subscription or withdrawal to the operation DB In order to provide the service to the user, the menu system is operated to provide statistical processing, bulletin board processing, e-mail, GIS information processing, and announcement menu and receive a selection menu. After the finishing process, the process is terminated, and the menu is repeatedly performed as a menu providing and selection step when a re-run is requested.

Prior patents provide an operation method that can efficiently process geographic information in a client server environment, a visualization method for each layer, and a method of compressing geographic information, and thus, there are many problems in providing high value-added geographic information services to general users due to the huge amount of data. Solving what was there.

1 is a schematic diagram of an apparatus for providing geographic information on a conventional Internet.

As shown in FIG. 1A, the web client 110 receives the geographic information data from the same type of geospatial data server 140, but the web application A and the web server B of the web server A 120 that provide the geographic information. When the web application B 130 of the 130 provides the geographic information in different forms, there is a problem in that it cannot be interoperable with each other since the geographic data is not compatible.

In addition, as shown in FIG. 1 (b), the geographic information received through the web servers A and B (160 and 170) by receiving geographic information from different geospatial data servers A and B (180 and 190) is shown in FIG. Since each web server (160, 170) has its own format for geographic information, there is a problem that can not be interoperable because there is no compatibility.

The conventional web geographic information providing system provided a service limited to one of an image data format and a vector data format. To explain the advantages and disadvantages of image data and vector data, when receiving a large amount of geospatial data in a vector format, it takes a lot of time in a slow network environment and the user takes a long time.

On the other hand, if a relatively small amount of geospatial data is provided in the image format, it is impossible to analyze the geospatial information requested by the client due to the nature of the image format, so that even a small analysis is continuously requested to the server, which may cause an overload of the server.

As described above, in the conventional web geographic information system, since each institution or company providing a service provides geographic information in a unique format, there is a problem that it cannot be interoperable.

The present invention has been made to solve the problems described above, when providing the Internet-based geographic information (GIS), the geographic information provided in the extensible notation language (XML) and geographic information transmission and exchange standard format Geography Markup Language (GML) can be used to ensure interoperability between geospatial information systems, as well as to ensure compatibility with geospatial information on a variety of different types of data servers. By supporting the interoperability between web and geographic information (GIS) servers that are being serviced, the geographic information provided by various web servers can be used simultaneously. In addition, GML documents can be converted into various image data formats such as GIF, PCX, PNG, SVG, JEPG, etc. according to the user's needs, and coordinate transformation components can be provided between data servers using different coordinate systems. Through geographic information of various coordinate systems can be provided.

In conclusion, the present invention aims to support not only the interoperability of the infrastructure but also the interoperability at the web service level for a large amount of geographic information stored in a distributed geographic data server. It is also an object of the present invention to provide an apparatus and method for providing a compatible geographical information on the web that can provide data in a form that meets a user's request, rather than an image or vector format.

1 is a schematic diagram of a device for providing conventional geospatial data.

2 is a schematic diagram of a geographic information providing apparatus of the present invention.

Figure 3 is a detailed view of the web application server of the present invention.

Figure 4 is a detailed view of the coordinate transformation and geographic information graphics generation unit of the present invention.

5 is a detailed view of a graphical element generating component of the present invention.

6 is a detailed view of the OLE database processing unit of the present invention.

<Description of Major Symbols in Drawing>

200: client application 300: Web server

400: web application server 410: input and output processing unit

420: service metadata provider 430: request generator

440: OLE database processing unit

450: coordinate transformation and geographic information graphic generator

460: coordinate system conversion component 470: GM (GML) generation component

480: Graphic element generation component 481: XML parser

485 SVG generator 490 image conversion component

500: Geographic Information Data Server

The present invention for achieving the above object is a geospatial data server upon receiving a request signal of geospatial data from a client requesting geospatial data on the web, geospatial data server for providing geospatial data on the web, the client Receives and interfaces with geospatial data from a web application server, and converts the geospatial data to a format requested by the client, and converts the size and position of the geospatial data into a GML document of an image or standard.

In addition, the web application server of the present invention is a service metadata providing unit for providing the service metadata, which is a document containing the serviceable content of the web when the client accesses, the geospatial data when receiving a request signal of the geospatial data from the client A request generator for generating a request signal of the OLE, an OLE database processor for receiving and requesting geographic information data from the request generator, and receiving geo information data from the OLE database processor for a request from the client. Coordinate transformation and geographic information graphics generating unit provided by converting.

In addition, the coordinate transformation and geographic information graphic generation unit of the present invention receives the geographic information data from the coordinate system transformation component, the coordinate system transformation component for converting the geographic information data into a position coordinate system in a form suitable for the client to generate a GML document GML generation component, a graphic element generation component that generates geospatial data in the form of SGG by referring to style information of the GML document generated from the GML generation component, or a graphic element generation component when the geographic information requested by the client is an image It further includes an image conversion component such as GIF, JPEG, PCX, PNG to convert the geospatial data of the SBG form into an image form.

In addition, the graphic element generating component receives an XML parser that parses when receiving a GML document, a styler that generates styles by receiving information from a symbol editor and a style editor on the geospatial data parsed by the XML parser, and receives geospatial data processed by the styler. It further comprises a SBG generator for generating in SBG format.

In addition, the present invention provides a capability document containing a serviceable content when the client is connected, receiving a geographic information data from the geospatial data server when the client requests the desired geospatial data based on the capability document; Converting the geospatial data into a format requested by the client. Providing the converted geospatial data to the client.

In addition, the step of converting the geospatial data of the present invention to the format requested by the client, the step of converting the size, location, etc. of the geospatial data and generating in the form of GML document, geographic data in the form of GML document in the form of vector Converting to a page form and providing it to the client, if desired geographic information data in the image format further comprises the step of converting the geographic information data in the form of SG to the image format provided to the client.

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

2 is a schematic configuration diagram of a web geographic information system presented in the present invention.

Client application 200 for requesting geographic information, web server 300 for providing geographic information and various information, web application server 400 for processing geographic information from client application 200 upon request and storing geographic information It consists of a plurality of geospatial data server 500 to provide.

The client application 200 first accesses the main web server 300 and receives a Capability document such as a list of layers that can be serviced by the current server with the help of the web application server 400. The client application 200 requests, in the form of URL, its own desired geographic information and information on the type of data to be serviced based on the received capability document. Upon receiving the request, the web server 300 converts the geographic information of the geospatial data server 500 into various image formats, SVGs (Scalable Vector Graphics) or GML data through the web application server 400 based on the contents of the URL. It is provided to the client application (200).

The client application 200 refers to a web browser for a web geographic information service such as Internet Explorer or Netscape on a user's terminal. When the user accesses the web server 300 and requests the geographic data using the client application 200, the web server 300 receives the geographic information from the geographic information data server 500 through the web application server 400. The data is received and provided to the client application 200.

On the other hand, in order to service the geospatial data on the web, the problem of dynamically interworking between the web server 300 and the geospatial data server 500 must be solved. Therefore, in order to access and process the geospatial data stored in the geographic information data server 500, and to work with the web server 300 to process and service the geospatial data of various formats to the client application 200 The web application server 400 is required.

On the other hand, Figure 3 shows a detailed view of a web application server 400 for providing geographic information of the present invention.

The configuration includes input / output processing unit 410 capable of grasping a request signal input from the client application 200 and transmitting and receiving data, and layer information and other capacities that the web geographic information system can provide when the client application 200 is accessed. The service metadata provider 420 provides a service metadata 421 containing capability information.

At this time, the service metadata 421 is composed of an extended standard language (XML) document generated by the service metadata data generator 422 offline based on the style information and the meta information of the geographical information data server 500.

In addition, the OLE database processing unit for receiving the geographic information in conjunction with the request generation unit 430 and the geographic information data server 500 to receive and interpret the request signal from the input and output processing unit 410 to request the geographic information requested by the user 440.

The OLE database processor 440 may receive geographic information by performing an interface with a plurality of geographic information data servers 500 that provide geographic information in various formats on the web.

In addition, in order to receive the geospatial data from the OLE database processing unit 440 and provide the geospatial data to the client application 200 in a format that meets the needs of the user, the geospatial data is converted into coordinates and graphics. And a geographic information graphic generator 450.

Referring to the operation of the present invention in detail, the user requests the geographic information data to the web application server 400 through the web server 300 in the form of a URL (URL) using the client application 200.

When a user accesses the client application 200 to receive geospatial data, the web application server 400 must provide a description of the capabilities it can provide, which is called service metadata. Here, metadata in the form of extensibility notation (XML) describing operations and contents possible in the service instance is stored in the capability document. When the client application 200 requests capability information from the web server 300, the service metadata providing unit 420 of the web application server 400 operates to provide a layer provided by the web geographic information system. The service meta data 421 document containing the information and other capability information is provided to the client application 200 of the user.

The service meta data 421 is an extended notation language (XML) document generated by the service meta data generator 422 offline based on the style information and the meta information of the geographic information data server 500. The client application 200 receiving the service metadata data 421 document requests geographic data desired by the user based on the service metadata data 421 document.

Meanwhile, the client application 200 of the user requests the web server 300 in the form of a URL in the form of URL, data format, and other information based on the received service meta data 421. To receive and provide geographic information.

If the OLE database processing unit 440 needs the coordinate system transformation to provide the user with the geospatial data received from the plurality of geospatial data servers 500, the coordinate system transformation component of the coordinate transformation and geospatial graphic generator 450 is required. (SRS) 460 converts to a data set of the coordinate system corresponding to the user's request.

The geospatial data transformed by the coordinate system transformation component (SRS) 460 to fit the client application 200 of the user is transmitted to the GM (GML) generation component 470 and the GM (GML) generation component 470. ) Generates the geographic data in the form of GM (GML). If the user's request format is GM (GML), the generated geographic information of the GM format is provided to the client application 200 through the input / output processing unit 410. If the user's request format is SVG, the generated GML format geographic information is converted into SVG format through the graphic element generating component 480 to convert the input / output processing unit 410 into the SVG format. It is provided to the client application 200 through. In this case, the graphic element generating component 480 assigns a style to each object based on the style information generated by the styler 484.

On the other hand, when the geographic information data requested by the client application 200 of the user is an image format such as PNG, GIF, JPI, etc., the above-described operation is performed to generate the graphic element generation component 480. The image information is converted into the image format requested by the user through the image conversion component 490, and then the geospatial data in the image format is provided to the client application 200 of the user.

4 is a detailed view of the coordinate transformation and geographic information graphic generator 450 which receives the geographic information data from the geographic information data server 500 and converts the geographic information data into data corresponding to the user's request.

If the user requests geographic information and needs coordinate system transformation of the geospatial data received from the OLE database processing unit 440, the coordinate system transformation component 460 performs geography with a data set of a coordinate system appropriate for the client application 200 of the user. Convert the information data.

The geospatial data transformed by the coordinate system transformation component 460 to fit the client application 200 of the user is transmitted to the GM generation component 470, and the GM generation component 470 applies the corresponding geographic information data. Geospatial data is generated in the GML format.

The generated GML format geographic information is sent to the graphical element generation component 480. The graphic element generation component 480 converts the SVG into SVG by referring to the style information. The geographic information data converted into SVG form is provided to the client application 200 of the user through the input / output processing unit 410.

On the other hand, if the geospatial data requested by the client application 200 is an image format, after converting the geospatial data in the form of SVG by referring to the style information in the graphic element generating component 480, the image conversion component 490 is converted to the image format requested by the user and then provided.

5 is a detailed view of the graphical element generating component 480 of the present invention.

The XML parser 481 parses input GML-type geospatial data, and accepts input from a source program, online statements, markup tags, etc. into various parts for processing by other programs. Divide. It also checks whether all the necessary inputs have been provided.

The geospatial data classified by the XML parser 481 receives the symbol information and the style information from the symbol editor 482 and the style editor 483 to style the geospatial data in the styler 484. The style information is information generated offline by the style editor 483 by referring to symbol information data generated offline by the symbol editor 482.

Meanwhile, the symbol information is a pictogram or an image to be displayed in place of a corresponding letter at a post office, a school, etc., and a symbol editor 482 is used to generate a symbol offline and store it in a symbol information table.

The style editor 483 defines a line thickness, a dotted line, a solid line, a broken line, and the like, a color, a symbol to be used, and stores the same in a style information table.

The geospatial data generated by the styler 484 is provided to the user in the form of SVG in the SVG generator 485.

6 is a schematic diagram of an OLE database processing unit 440 of the present invention performing an interface upon receiving geographic data from a plurality of geographic data data servers 500.

In order to perform an interface by receiving various types of data from a plurality of geographic information data servers 500 that provide geographic information on the web. The OLE database processing unit 440 receives geographic information data in the form of ZEUS, GMS, SDE, MGE, MSSQL, Smallworld, Shpae, etc. from a plurality of geospatial data servers 500 to receive a GML data format or an image. The conversion is done so that you can provide it in a format.

As described above, the present invention provides geographic information data on a web, and the geographic information of a plurality of geographic information providing systems on the web that provide geographic information in a different format may be stored in an SGV format or other image form. By converting and providing the geospatial data, it is possible to integrate and interoperate the information of all geospatial data providing systems on the web.

As described above, the present invention supports the interoperability between a plurality of web geographic information data servers on the web. Since there is a compatibility that can interoperate with a plurality of geospatial data data provided from various web-geographic data server, there is an effect that can share geographic information.

In addition, due to the sharing of geographic information, it is possible to prevent overlapping investment in the construction of geographic information database, to provide geographic information of various coordinate systems, and to provide various image formats and vector formats according to user's requirements. It can be effective.

Claims (12)

A client for requesting geographic information data through a web server in the form of a URL using a client application on the web; A geospatial data server for providing geospatial data, including a plurality of geospatial data servers for geospatial information in different formats on the Web; When the request signal of the geospatial data is received from the client, the geospatial data is interfaced by receiving the geospatial data from the geospatial data server, and the geospatial data is converted into a size, a position, and the like to conform to the format requested by the client. A web application server providing an image or a standard GML document; Apparatus for providing compatible geographical information on the web, characterized in that it comprises a. The method of claim 1, The web application server, An input / output processing unit for transmitting and receiving data and processing a command when the client accesses the data; A service metadata providing unit for providing service metadata in an extensible notation language designed to transmit information having serviceable contents of a corresponding web to a structured document when the client accesses it; A request generation unit for generating a request signal of the geo information data when receiving a request signal of the geo information data from the client; An interoperable OLE database processing unit which receives a request signal from the request generation unit and requests and receives the geographic information data from a plurality of geographic data data servers; And a coordinate transformation and geographic information graphic generation unit which receives the geographic information data from the OLE database processing unit, converts the geographic information data into a format requested by the client, and provides the geographic information graphic. delete delete delete delete The method of claim 2, The coordinate transformation and geographic information graphic generation unit includes: a coordinate system transformation component that converts and processes geographic information data into a form suitable for a client; A GML generation component that receives the geographic data from the coordinate system transformation component and generates a GML document; A graphic element generation component configured to generate geographic information data in an SG form by referring to style information on a GML document generated from the GML generation component; An image conversion component for converting geographic information data of the SBG form into an image form from the graphic element generating component and providing the geographic information requested by the client in an image form; Compatible geographic information providing device on the Web, characterized in that it further comprises. The method of claim 7, wherein The graphical element generating component may include: an XML parser that parses the GML document upon receipt; A styler for creating styles by receiving information from a symbol editor and a style editor on the geospatial data parsed by the XML parser; An SG generator for receiving the geospatial data processed by the styler and generating the SG format; Compatible geographic information providing device on the Web, characterized in that it further comprises. The method of claim 8, And the symbol editor generates and stores pictograms or images for identifying a post office, a school, a building, etc. to be included in the geographic information data. The method of claim 8, And the style editor defines and stores a thickness, a dotted line, a solid line, a dashed line, or the like of the geospatial data to be provided, a shape, a color, a symbol to be used, and the like. Providing a capability document containing serviceable content when the client connects; Receiving the geospatial data from a geospatial data server when the client requests desired geospatial data based on a capability document; Converting the geospatial data into a format requested by the client and converting the size and position of the data into a GML document; Converting the geographic information data of the GML document form into the SGV form in a vector format and providing the same to the client; If the geographic information data of the image format is desired, the step of converting the geospatial data of the SBG form into an image format and providing to the client; comprising a. delete