Import of vector maps formats SXF, TXF, DIR
Format SXF is the format of the exchange and storage of vector maps in the archive. The format is developed in 1992 by specialists of the Topographic Service of the Armed Forces and in 1993 adopted as the main exchange format for digital information on the location in the Armed Forces and a number of Federal Service of the Russian Federation.
Format SXF provides a more effective solution of the following tasks:
- archiving of digital topographic and navigation maps and plans of cities;
- improve the reliability of storage and transmission reliability of digital maps in various formats and channels of communication;
- decrease of sizes for the stored information;
- application of various technologies and means for creating digital topographic and navigation maps and plans of cities, with the results to a common format.
Format SXF may have a binary form or text - in the form of a file TXF. For ease of import of several maps (from two to several thousand) may be applied a text file DIR, containing a list of files SXF and TXF. Under the map can be understood as a separate layer, sheet or a set of adjacent sheets with a common passport.
From a single file SXF or TXF a vector map is created, which contains files SIT, SHD, SDA, SSE and SGR. Files SSE and SGR are created only only at presence of semantics and graphic objects.
The vector map from separate file SXF (TXF) is created identical to the which it has been saved, without change of parameters of a projection, system of coordinates, units of measure and other properties.
For creation of a vector map it is necessary to choose a file the classifier (RSC), containing list of codes of objects and their conventional symbols. If the name of the classifier is written down in file SXF or TXF it at once is displayed in dialogue.
In the absence in the classifier of objects codes that are available in the file SXF or TXF, map objects are purple (lines, polygons, point crosses and titles). Which can then be converted by the appointment of a new code and a conventional sign for them, or by changing the classifier onto the one that has a complete set of codes.
When you import a map, you can select a list of objects that will be imported, using the Filter button.
If the map is imported, which is limited by the frame, then compliance control of framework coordinates on a map and in a map passport is performed. For SXF file the calculation of the checksum and comparison with the value in the passport is performed. All error messages are duplicated in the file LOG, which is located in the folder with the new map. If you find bad areas in the file the processing continues after the bad data site.
After importing data the map will automatically open in a new window.
When you import a list of maps from the file DIR you can combine them into multisheets map (MAP) or create a set of individual maps (SIT), combined into a project (MPT). When you import the topographic maps of several zones that store the coordinates in meters,it will be done a transformation of maps to the zone of map (sheet), standing in the list first.