![]() DXF FormatThe DXF (Drawing Interchange File) format was developed to help the communication between the AUTOCAD and other programs. These files can be transformed to other CAD systems or other programs. The DXF files are text files in the ASCII format. The organization of a DXF file has the following format:
The SPRING uses the entities section and tables at the importing moment of the DXF format for the SPRING. The SPRING imports DXF data in the thematic and numeric models and for that, it is required that the data has been digitized following some criteria. For thematic data the SPRING imports only lines and points. The lines have to be digitized in the AUTOCAD in the "line" format, or "polyline" format, the user should be careful when correcting lines. The identifier representing the line color characteristics, must be of the "Point" type with an associated color and has to be placed at any point inside the polygon. At the digitalization moment the user has to have a color associated to the digitalized object or to the whole information layer. As an importing product one has to have, closed polygons with specific color by the identifier, and polygonal lines with the line color or plane (In this SPRING version identifiers are not imported). At the lines importing moment the SPRING automatically makes an error adjust with a value smaller than 0.5mm (Adjusted Lines option). Polygons with an error greater than 0.5 mm are imported as polygonal lines. After importing Lines and Identifiers the system executes the polygonalization. Lines that were not adjusted or that do not make polygons are transformed in polygonal lines, and can be properly corrected and identified inside the SPRING environment. For numerical data in the DXF format, the SPRING imports spot heights, that is, data in the (X, Y, Z) format, where X and Y are the planar coordinates and Z the height value. The spot heights have to be digitized in the AUTOCAD as "line" or "Polyline", and the spot heights as "Point". NOTE: A DXF file can be imported in planar coordinates (meters, kilometers, millimeters, feet or inches), or geographical coordinates (decimal degree or decimal second), but only exported in planar coordinates (meters).
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