KR20010044367A - Method for conversion from DXF file to GEOMania Data File - Google Patents

Abstract

PURPOSE: A method for converting a DXF(Drawing eXchange Format) file into a GEOMania data file is provided to convert graphic entities of a DXF file that is a exchange data format of various commercial GISs(Geographic Information Systems) and used in a CAD system into a data file of a GEOMania GIS software. CONSTITUTION: An operation processing part reads a DXF file to be converted from a map data storage part, and sets up a GDF(GEOMania Data File) to be generated(100). The operation processing part extracts a total area coordinates value, a standard spatial data character value and a layer name value from a header part and a table part of the DXF files(110,120), converts the layer name into a header part of an initial GDF, draws up the header part(130), converts the values into a header of a spatial part of the GDF, draws up the header(140), extracts graphic entities information of a entity part of the DXF file(150), converts the information into a page body among the spatial part of the GDF and draws up the page body(160). The operation processing part decides whether or not graphic entity among the DXF file remains(170) and displays the GDF that conversion is completed on a screen in case grahpic entity does not remain(180).

Description

How to convert dexf file to geomania data file {Method for conversion from DXF file to GEOMania Data File}

The present invention relates to a method of converting a format between different map data used in a Geographic Information System (GIS). The present invention relates to a graphic entity of a drawing system format (DXF) file of a CAD system in a general computer. How to convert GDF files, which are GEOMania data files.

However, DXF files, which are exchange data formats of various commercial geographic information systems used in Korea and standard extension formats used in CAD systems, cannot be converted to data files of Geomania, which is a GIS software used in Korea. Therefore, there was a problem that it is impossible to use the geospatial data pre-built as a DXF file.

The problem of the present invention is to extract the header part and the table part data of the DXF file, which is the data file of the CAD system, to solve the problems of the prior art described above. It converts the header part and the spatial part into the spatial header part, and extracts data such as points, text, lines, and polygons, which are various graphic entities in the entity part of the DXF file, and converts the data into the page body in the spatial part of the geomania data file. To convert. In other words, only the graphic entity information of the DXF file is extracted and stored in the header part and the spatial part except for the link part and the non-spatial part of the GDF which is a geomania data file.

1 is a block diagram showing a file conversion system to which the present invention is applied;

FIG. 2 is a flowchart for explaining a method of converting a de-FS file into a geomania data file in the system of FIG. 1;

3 is a basic structural diagram of a DXF file,

4 is a schematic diagram of a GEOMania data file

<Explanation of symbols for main parts of drawing>

101: map data storage unit 102: input unit

103: RAM 104: ROM

105: output port 106: video memory

107: screen display unit 108: arithmetic processing unit (CPU)

In order to achieve the above object, a method of converting a DXF (Drawing eXchange Format) file of the present invention to a geomania data file GDF includes: (1) specifying a DXF file to be converted and a geomania GDF file to be generated based on the After the step and the setting, (2) after grasping and extracting information of the header part of the DXF file and after the extraction, (3) grasping and extracting information of the table part of the DXF file and after the extraction, (4 ) Creating a header part of the geomania GDF file using the extracted data; and (5) creating a spatial header of the spatial part of the geomania GDF file, and (6) the entity part of the DXF file. Grasping and extracting information of the graphic entity in the; and (7) creating a page body of a spatial part of a geomania GDF file using the extracted data. (8) identifying whether there is a graphic entity left in the DXF file to be converted, and (9) displaying the geomania GDF data file generated after the conversion is completed on the screen after the determination and (10) closing the DXF file after the operation is finished, and (11) storing and closing the geomania GDF data file after the operation is completed. Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a file conversion system to which the present invention is applied. As shown, the file conversion system to which the present invention is applied includes a map data storage unit 101 for storing map data and an input unit 102 for reading a DXF file to be converted through a user interface and setting an initial geomania GDF file. ). The map data storage unit 101 and the input unit 102 are connected to the arithmetic processing unit 108. The arithmetic processing unit 108 is used for all processes of converting DXF files stored in the map data storage unit 101. It is in charge of operation processing and control. In addition, the operation processing unit 108 is connected to an output port 105 for connecting an output device for outputting a map. In addition, the calculation processing unit 108 includes a storage unit 104 and a map data storage unit 101 of a ROM (ROM) in which a file conversion application program based on a Geographic Information System (GIS) to which the present invention is applied. The conversion target file 103 is connected to a read-out conversion target file and a storage unit (RAM) which temporarily stores various result values calculated by the operation processing unit 108. In addition, the arithmetic processing unit 108 is connected to a video memory 106 and a screen display unit 107 for displaying a map file to be converted on the screen.

Hereinafter, a description will be given with reference to a flowchart of FIG. 2, which is illustrated for explaining the detailed process of the present invention. In FIG. 1, the map data storage unit 101 uses a hard disk CD-ROM, a diskette, and the like, and stores map data in a file form. Before describing the conversion process, the DXF file and GDF, the geomania data file, are explained as follows.

3 is a basic structural diagram of a DXF file. The DXF file is largely composed of four parts: a header part, a tables part, a blocks part, and an entity part. The header part stores general information such as parameters related to the range, version, dimension line, etc. of the entire area of the drawing, and the tables part includes a symbol table such as line information, layer information, and text information. It stores the contents of Blocks Part defines several pieces of figures and drawing information defined by one name, and Entities Part defines the type, line type and type of spatial data such as line, polyline, text, and circle. Coordinates and layer names are stored.

4 is a structural diagram of a GDF file which is a GEOMania data file. This GDF file is a map data format that is frequently used in the construction of the GIS system in public works projects such as computerized projects and private companies. The GDF file consists of four parts, header part, link part, spatial part, and non-spatial part. The header part is an identifier. Information about the entire file, such as a file version, a file name, and a layer name, is stored. The link part stores information for connecting the spatial part and the non-spatial part. The spatial part stores values of spatial data such as lines, polylines, texts, and circles, and the non-spatial part stores values of nonspatial data, which are attribute information of spatial data. have.

As a preparatory step, the arithmetic processing unit 108 having a central processing unit (CPU) is based on a geographic information system with a file conversion function to which the present invention is stored, which is stored in a second storage unit (ROM). Run the file conversion application.

In the first step, the calculation processing unit 108 first reads the DXF file to be converted, which is stored in the map data storage unit 101, and stores the total graphic entity quantity in the storage unit RAM (RAM). The newly created geomania GDF file is set through the input unit 102 and stored in the RAM, which is the first storage unit 103 (step 100).

In the second step, the calculation processing unit 108 grasps the header part of the selected DXF file, extracts the X1 and Y1 coordinates of the upper left and the X2 and Y2 coordinates of the lower right, which are the entire areas of the map, and stores them. 103) RAM (step 110).

In the third step, the calculation processing unit 108 grasps the table part of the DXF file, extracts the standard spatial data characteristic values such as the layer name and the color, shape, thickness, and text of the line, and stores them in RAM, which is a storage unit. (Step 120).

In the fourth step, the layer name of the result values extracted in the third step and stored in the RAM (storage part 103) is converted into the header part of the geomania GDF file to convert the initial geomania GDF file. Create a header part (step 130).

In a fifth step, the calculation processing unit 108 may include the X1 and Y1 coordinates of the upper left of the map extracted in the second step among the values stored in the RAM of the first storage unit 103. The X2 and Y2 coordinate values at the bottom right and standard spatial data property values such as color, shape, thickness and text of the line extracted in the third step are converted into headers of the spatial part of the Geomania GDF file (step 140). .

In a sixth step, the operation processor 180 grasps the information of the entity part of the DXF file, extracts the type, line type, coordinates, and layer name for each graphic entity, and stores the RAM (referred to as RAM 1) 103. RAM) (step 150).

In a seventh step, the graphic entity information of the DXF file extracted in the sixth step is converted into a page body of the spatial part of the geomania GDF file and created (step 160).

In an eighth step, the calculation processing unit 108 determines whether there is a graphic entity to be converted next, based on the quantity of all graphic entities of the DXF file extracted in the first step, and if there is an entity to be converted, the sixth step. Repeat step (step 150) and seventh step (step 160), and if there are no more graphical entities to convert, go to the next step (step 170).

In a ninth step, the operation processing unit 108 displays the converted geomania GDF file on the screen (step 180).

In the tenth step, the DXF file is closed because there are no more graphic entities to convert (step 190).

In the eleventh step, the operation processing unit 108 saves the final created geomania GDF file, closes the file, and finishes all file conversion processes (step 200).

As described above, the present invention utilizes a variety of geo-information data that is pre-built in DXF files, which are exchange data formats used in various GIS and CAD systems. By converting the data file into spatial data of the GDF file, the cost and time can be greatly reduced in constructing the map data that is the most fundamental to the development of the geographic information industry.

Claims (3)

In the method of converting a dexf file to a geomania data file, (1) reading and selecting a DXF file to be converted, and setting up a geomania GDF file to be created; (2) extracting graphic entity information from the DXF file and converting the graphic entity information into spatial data of a Geomania GDF; (3) A method for converting a de-X file into a geomania data file, comprising the steps of organizing the converted DXF file and the geomania GDF file. The method of claim 1, wherein in step (2) (1) extracting the layer name value of the table part of the deX-F file and converting the layer name value into a header part of the initial geomania GDF file to create it; (2) extracting the global region coordinate values from the header part of the DeX file and the standard spatial data property values from the table part, converting them into headers of the spatial part of the Geomania GDF file; (3) extracting the graphic entity information of the entity part of the DeX file and converting it to a page body among the spatial parts of the Geomania GDF file to create the DeX file as a Geomania data file. How to convert. The method of claim 1, wherein in step (3) (1) determining whether there is a graphic entity to be converted left in the DeX file; (2) if there is a graphic entity to be converted in the DeX file, continuing to process it; (3) displaying the converted geomania GDF file on the screen when there is no graphic entity to be converted in the DeX file; (4) closing the converted DSP file; (5) A method for converting a De-FX file to a Geomania data file, comprising the steps of: closing the file and closing the file after saving the finally created Geomania GDF file.