KR0175738B1 - Data base transformation method - Google Patents

Abstract

The present invention relates to a data conversion method for a geographic information system, and to a method for converting an infomap database into a data exchange format (DXF) data format in a medium computer environment. That is, it extracts parameter values and definitions of tables by reading the DXF data format file that has the same spatial data and attribute data in the infomap database using information such as schema table, line table, and symbol table. It creates a block file and converts the graphic elements of the DXF data format file into an infomap database with the same contents using extracted values and table information.

Description

How to convert an INFORMAP database to the DXF data format

1 is a hardware structural diagram of a mid-range computer applied to the present invention.

2 is a schematic diagram of an information map (INFORMAP) database.

3 is a data exchange format (DXF) data format file structure.

4 is a flowchart illustrating a process of converting an infomap database into a DXF data format according to the present invention.

* Explanation of symbols for 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 6: initial configuration

7: Extract Infomap data type information 8: Extract Infomap table information

9: Extract Infomap Symbol Information 10: Extract Infomap Spatial Data

11: Convert Infomap Data to DXF Data

12: Whether symbol exists 13: Symbol processing

14: Attribute Existence

15: Convert attribute data to DXF data

16: Convert Spatial Data to DXF Data

17: Add converted data to DXF data file

18: Whether there is spatial data to be converted

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data conversion method for a geographic information system, and more particularly, to a method for converting an INFORMAP database to a data exchange format (DXF) data format in a medium computer environment.

In the related art, the information map database is not converted to the DXF data format, and thus the geographic information system for facility management in which the info map graphic database system is used cannot be used in the CAD system.

In addition, it is necessary to convert not only basic graphic data but also symbol and attribute data due to the characteristics of the drawing data for the geographic information system.There is no conversion method, so that the drawing data created by the geographic information system using the infomap can be converted to other It was not available in the CAD system.

Accordingly, in order to solve the above-mentioned problems, the present invention uses the information map database such as schema table, line table, symbol table, and the like to map spatial data and attribute data of the infomap database to the same DXF data format file. The purpose of this is to extract the parameter values and definitions of tables and create block files, and to convert the graphic elements of DXF data format files into the infomap database with the same contents using the extracted values and table information.

In order to achieve the above object, the present invention provides a method for converting a DXF data format into an infomap database in a medium-sized computer hardware environment, the method comprising: setting an initial environment by receiving an infomap database file name and a generated DXF file name to be converted; A second step of extracting information map data type information and converting the information map information into a DXF layer table in the main memory device, and a third step of extracting information of the information map tables and converting the corresponding table information into a DXF table shape; A fourth step of extracting the infomap symbol information and adding it to the DXF file in the main memory; a fifth step of extracting the infomap spatial data and classifying data types in the main memory; and a sixth step of converting the infomap data into the DXF data. If the spatial data is a symbol, the symbol type, input position, accumulation, color, etc. A seventh step of extracting the beam and converting it into DXF data, and an eighth step of extracting information into attribute data and converting the extracted spatial data into DXF data if there is an attribute defined in the converted DXF data. And a tenth step of adding the converted spatial data and the converted data to the DXF data file.

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

1 is a hardware configuration diagram of a medium-sized computer to which the present invention is applied. As shown in FIG. 1, a central processing unit 1 and a program to be executed by the central processing unit 1 which control and manage overall operations of the computer and perform tasks are shown in FIG. And an input / output for controlling the input / output of the auxiliary memory device 4 and the input / output device 5 connected to an internal connection bus, and a main memory device 2 for storing various data used during operation. It consists of the controller 3. The auxiliary memory device 4 serves to store a large amount of data, and the input / output device 5 includes a keyboard, a display device, a printer, and the like.

In the medium-class computer configured as described above, the main memory device 2 stores a program for converting the infomap database of the present invention into the DXF data format, and is executed under the control of the central processing unit 1.

First, the DXF data format and the features of the infomap database are explained.

The infomap database (see Figure 2) is a graphical database for spatial data and related geographic information. The infomap database consists of spatial files with pointers to attribute data. Spatial files can have up to 128 data types, each of which is stored as a separate file. There are five types of spatial data in Infomaps: Line and Curve Records, Annotations Records, Symbols Records, Function Symbol Records, and Function Line and Curve Records. Contains information about system tables, such as symbol tables and annotation tables.

The DXF data format (see Figure 3) consists of four sections: Header, Table, Block, and Entities. Data elements are defined. The header section consists of parameters with general information of the drawing, and the table section defines a layer, a line type table, and the like. The block section is composed of several blocks used in the drawing, in which one block includes several drawing elements. The entity section contains the actual data list for the drawing elements. The entities used in DXF include lines, polylines, circles, arcs, text, inserts, attributes, viewports, vertices, There are an array, a solid, a point, an attribute definition (ATTDEF), an attribute (ATTRIB), and a trace. Each drawing element has a separate format consisting of group codes.

4 illustrates a process of converting an infomap database into a DXF data format according to the present invention. After the conversion program is uploaded from the auxiliary memory device 4 to the main memory device 2 and the operation is started by the central processing unit 2, the auxiliary memory device 4 receives the name of the information map database file to be converted and the DXF file name to be generated. Open the infomap database file in the), create a new DXF file in the auxiliary storage device (4), extract the drawing information (uppermost coordinates, lowest coordinates, etc.) of the database file to be converted, and upload it to the main memory device. Initial configuration (6) is performed by converting to header section of data format and adding to DXF file. After the above process, the process of extracting the infomap data type in the auxiliary memory device 4 and extracting the information map data type information from the main memory device 2 to the layer table of the DXF is performed, and the line table information of the infomap is performed. An infomap table information extraction process (8) is performed in which annotation table information is extracted and the corresponding table information is converted into a DXF table form on the main memory device 2 and added to the DXF file.

After the above process, the information map symbol information extraction 9 is performed to extract the info map symbol information, convert it into a block section of the DXF data format on the main memory device 2, and add it to the DXF file. At this time, the symbol of the infomap database is a set of graphic objects and is defined as a symbol table.

After the above process, the spatial data of the infomap database file in the auxiliary memory device 4 is extracted and the information map spatial data extraction 10 for classifying data types on the main memory device 2 is performed. Information related to the data type is extracted from the spatial data extracted in this process, and classified into lines, curves, arcs, circles, and symbols on the main memory device 2.

After the process of extracting the infomap spatial data (10), the process of converting the characteristics of the infomap data, for example, the color, size, data type, and the like into the DXF data (11) is performed. Here, the color, line shape, font size, etc. of the data are extracted in the process of extracting the infomap table information (8) and refer to the line table and annotation table information on the main memory device (2) as data characteristics of the appropriate DXF data format. Matching, the data type is converted into a layer of a proper DXF data format and the contents are stored in the main memory device 2.

After converting the infomap data into DXF data (11), a symbol presence (12) determination process is performed to determine whether a symbol exists. In this process, the symbol type, input position, accumulation, The symbol processing 13 process of extracting information such as color and converting the data into DXF data is performed.

After going through the symbol presence 12 process, the process of determining whether the attribute exists 14 determining whether the spatial data has the defined attribute information is performed. If the attribute information is defined in this process, the attribute data of the infomap database is converted to DXF data (15). If the attribute information is not provided, the process proceeds to the next step.

The process of converting the spatial data into DXF data using the transform function, the characteristic information on the main memory device 2, the table information, the layer information, etc. after the process of determining whether the attribute exists 14 is performed. Do this.

After the process of converting the DXF data (16), the process of adding the converted data to the DXF data file (17), which adds the converted spatial and attribute data to the DXF data file, is performed.

After the process of adding the converted data (17), the process of determining whether there is spatial data to be converted (18) is performed, and if there is no spatial data in this process, the operation is terminated, and the spatial data exists. If the process proceeds to the branch after the process of extracting the information map symbol information 10, the process is repeated.

As described above, according to the present invention, by converting the infomap database into the DXF data format, even in the geographic information system for facility management using the infomap, the digital maps and facility drawings created by the CAD system can be used by other geographic information systems or CAD systems. do.

Claims (8)

A first step of setting an initial environment by receiving the name of the converted infomap database file name and the generated DXF file name; and a second step of extracting the infomap data type information and converting the information into a DXF layer table in the main memory device; The third step of extracting the corresponding table information from the main memory device into the DXF table form, the fourth step of extracting the information of the infomap tables and adding the information to the DXF file from the main memory device, and extracting the infomap spatial data from the main memory device. A fifth step of classifying data types in the second step; a sixth step of converting the infomap data into DXF data; and a step of extracting information such as symbol type, input position, accumulation, and color into the DXF data when the spatial data is a symbol. Step 7, if there is an attribute defined in the converted DXF data, the information is extracted from the attribute data and the DXF data Converting the extracted spatial data into DXF data, and the tenth step of adding the converted spatial data and the converted data to the DXF data file. How to convert. The method of claim 1, wherein in the first step, the infomap database is a graphical database for a geographic information system capable of processing spatial data and associated attribute data, and is composed of spatial files having pointers connecting attribute data. Converting the infomap database to the DXF data format. The data file of claim 2, wherein the spatial file includes line and curve records, annotation records, symbol records, facility symbol records, and functional line and curve records. How to convert an infomap database to the DXF data format, which contains information about the system tables, such as line tables, symbol tables, and annotation tables. The method of claim 1, wherein the information corresponding to the second to fifth steps is extracted by the auxiliary memory device. The method of claim 1, wherein if the symbol does not exist in the seventh step, the method proceeds to the eighth step. The method of claim 1, wherein if the attribute defined in the spatial data does not exist in the eighth step, the ninth step proceeds to the ninth step. The method of claim 1, wherein the step of extracting the attribute information of the eighth step and converting the attribute information into DXF data comprises extracting attribute data related to spatial data of an infomap database and using a ATTDEF of the DXF data format and an ATTRIB entity. And converting the infomap database into the DXF data format, characterized by generating DXF data having the same contents. An infomap, characterized in that if the spatial data to check whether there is spatial data to be converted after the step 10 exists, repeating the process after the fourth step, and ending the task if the spatial data to be converted does not exist How to convert a database to DXF data format.