KR19980072391A - How to convert Arc / Info intermediate files to KXF data format - Google Patents

Abstract

The present invention relates to a data conversion method for a geographic information system (GIS), and in particular, a method for converting an arcinfo (Arc / Info) intermediate file into a KXF file in a medium-sized computer environment. Data compatibility between KXF and ArcInfo, a software for GIS, which is widely used in Korea, becomes possible, so that data can be used in other geographic information systems that use KXF as a standard.

Description

How to convert Arc / Info intermediate files to KXF data format

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data conversion method for a Geography Information System (hereinafter referred to as GIS), and more particularly, to convert an Arc / Info intermediate file into a KXF (Korea stndard eXchange Format) file in a medium computer environment. It is about a method.

Conventionally, the arc information (Arc / Info) intermediate file is not converted to the KXF data format, and there is a problem in that the arc information file cannot be used in a geographic information system using the KXF file as a standard in Korea.

That is, there is no compatible method with data generated in a geographic information system different from KXF determined by the Korean standard format.

In order to solve the conventional problems as described above in the present invention, each of the spatial object consisting of a point (Arrc), polygons (Polygon) and the general of the arc info (Arc / Info) intermediate file After reading the KXF initialization file using the information of the property file, the purpose is to convert the arcinfo file to the KXF data format while maintaining the same contents for each spatial object, property, and metadata information.

1 is a block diagram showing a hardware configuration applied to the present invention.

2 is a KXF data format diagram.

3 is an arc / info intermediate file format diagram.

4 is a flow chart illustrating a process of converting an arcinfo intermediate file to KXF data format in accordance with the present invention.

* Description of the symbols for the main parts of the drawings *

1: central processing unit 2: main memory unit

3: input / output controller 4: auxiliary memory device

5: input / output device

In order to achieve the above object, the GIS data conversion method proposed by the present invention comprises the steps of: setting an initial environment by receiving an arc info (Arc / Info) intermediate file and a KXF initialization file to be converted;

Extracting spatial elements from an Arc Info info intermediate file after said step;

Converting the extracted spatial objects into respective objects corresponding to KXF files;

Checking whether the spatial object to be converted and the associated attribute information remain, and if so, repeatedly adding the converted spatial data and the converted data to the KXF file;

Once all the data is added, the associated attribute information is extracted from the point, arc, and polygon space objects on the main memory and converted to the data dictionary module of the KXF file, and the general attribute file is extracted to the data dictionary module of the KXF file. Converting;

Generating and converting metadata information of the arcinfo intermediate file into a KXF file; And

After performing all the above steps, including the step of storing the finally converted individual data on the main memory as a KXF file, characterized in that the conversion of the arcinfo intermediate file to the KXF data format.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing the hardware configuration of a medium-sized computer to which the present invention is applied, comprising: a central processing unit 1 for controlling and managing the overall operation of the computer;

A main memory device (2) for storing a program to be executed in the central processing unit (1) and storing various data used during a job execution; And

And an input / output controller 3 connected to an internal connection bus and controlling input / output of the auxiliary storage device 4 and the input / output device 5.

In this case, the auxiliary memory device 4 serves to store a large amount of data, and the input / output device 5 includes a general keyboard, a display device, a printer, and the like.

In the main memory device 2 of the medium-class computer configured as described above, a program for converting the ARC / Info intermediate file KXF data format proposed in the present invention is stored, which is controlled by the central processing unit 1. Perform.

Prior to describing the program execution of the present invention, the general features of the Arc / Info intermediate file and the KXF data format will be described.

First, the Arc / Info intermediate file is shown in FIG. 2, which is a GIS intermediate format designed to be compatible with programs and data used in different GIS systems.

In the Arc / Info intermediate file, points, arcs, and polygons are basically supported as spatial objects. In addition, spatial shapes such as circles and curves are supported. It is also designed to be switchable.

These spatial objects are associated with the corresponding property files using the ID as a key.

That is, the point feature file is associated with the point property file through the point ID, the arc feature file is associated with the arc property file through the arc ID, and the polygon feature file is the polygon ID. It is associated with the polygon properties file via.

In addition, it stores 'Tic file' as a control point, and also stores BND (Boundary) file indicating the spatial range of spatial data.

In addition, a 'Log file' representing the processing history information of spatial data exists in ASCII format, and the information on projection is contained in the 'prj file'.

Second, as shown in FIG. 3, the KXF data format is a spatial database transfer standard (SDTS) defined as the U.S. standard GIS format in the Korean GIS standard format in consideration of the Korean situation, and is composed of a total of 5 parts.

Part 1 defines the suitability of the digital map data, conceptual model, etc., Part 2 defines the attribute information and term definition for geographic information, and Part 3 defines the compatibility of spatial data using ISO 8211. , Part 5 and 6 contain vector and raster profile information, respectively.

In addition, the KXF data format used for conversion basically uses only the Part 4 vector profile part, and among the total 25 vector spatial object definition modules, identification module, catalog / directory module, and data dictionary module Nine modules, including the Data Dictionary, are used to switch back and forth.

Referring to the process of changing the file having each of the above characteristics by the method of the present invention as follows.

4 is a flowchart illustrating a process of converting an arc / info intermediate file KXF data format according to the present invention, after the conversion program is loaded from the auxiliary memory device 4 into the main memory device 2, and then the central processing is performed. Step S1 of opening an arc info (Arc / Info) intermediate file to be converted and initializing a KXF file to be generated when the operation is started by the apparatus 1;

After the step S1, a new KXF file is created in the auxiliary memory device 4, and the spatial elements (Point, Arc, Polygon) are extracted by reading the intermediate file Arc / Info from the auxiliary memory device 4, Putting it on the main memory device (S2);

Subsequent to step S2, point space objects and attributes of the extracted spatial elements are converted to KXF space objects using the conversion program according to the present invention, arc space objects and attributes are converted to KXF space objects, Continuously converting polygon spatial objects and attributes to KXF spatial objects and adding them to the KXF file (S3);

Checking whether the spatial object to be converted and the associated attribute information remain after the step S3, and repeatedly performing each of the processes of adding the converted spatial data and the converted data to the KXF file if remaining (S4). )Wow;

Then, the associated attribute information is extracted from the point, arc, and polygon space objects on the main memory (2) and converted into a data dictionary module of the KXF file. Converting (S5);

After performing the step (S5), upload the projection part, the 'log part' and the metadata information in the arc info (Arc / Info) intermediate file to the main memory (2) and then the spatial reference of the KXF file (Spatial Reference) Converting to a module and a data quality module (S6); And

Finally, the converted individual data is stored on the main memory device 2 as KXF data, thereby converting to the Arc / Info intermediate file KXF data format (S7).

As described in detail above, according to the present invention, the Arc Info (Arc / Info) intermediate file can be converted to the KXF data format, and thus, KXF, which is defined in the GIS standard format in Korea, and GIS software, which is widely used in Korea, is used. As data becomes compatible with each other, it can be used with other geoinformation systems that use KXF as a standard.

In addition, a preferred embodiment of the present invention is disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the following claims You will have to look.

Claims (3)

Setting an initial environment by receiving an arc info (Arc / Info) intermediate file to be converted and a KXF (Korea stnadard eXchange Fomat) initialization file; Extracting spatial elements from an Arc Info info intermediate file after said step; Converting the extracted spatial objects into respective objects corresponding to KXF files; Checking whether the spatial object to be converted and the associated attribute information remain, and if so, repeatedly adding the converted spatial data and the converted data to the KXF file; Once all the data is added, the associated attribute information is extracted from the point, arc, and polygon space objects on the main memory and converted to the data dictionary module of the KXF file, and the general attribute file is extracted to the data dictionary module of the KXF file. Converting; Generating and converting metadata information of the arcinfo intermediate file into a KXF file; And And storing the finally converted individual data as a KXF file on the main memory after performing all the above steps, converting the arcinfo intermediate file into the KXF data format. The method according to claim 1, The step of converting each extracted spatial object to each object corresponding to the KXF file comprises: converting a point spatial object and an attribute among the extracted arcinfo intermediate file spatial elements into a corresponding spatial object of the KXF; Converting an arc spatial object and an attribute among the arcinfo intermediate file space elements into a corresponding spatial object of the KXF; And And converting the polygon spatial object and the attributes among the arcinfo intermediate file space elements into the corresponding spatial object of the KXF. The method according to claim 1, Generating and converting the metadata information of the arcinfo intermediate file into a KXF file may include: projecting, logging, and metadata data of the arcinfo intermediate file on a main memory device; File conversion method characterized in that the conversion to the module.