When generating a binary network from a GIS street database, information about the coordinate system is stored inside the binary files. This is stored in the same format as used by MapInfo coordinate clauses (text format). The maximum length of the text is 240 characters.
When generating the binary network from TAB or MIF files, this is done automatically. When generating it from SHP or CGF files, you have the option of passing the string as a parameter. If an empty string is passed, a default coordinate clause is generated.
You can at any time get the coordinate clause of the currently loaded network from property CoordSys.
The coordinate clause is used, when native GIS files are generated as output from various RW Net functions (e.g. NodeCreate etc.).
TAB / MIF format
When the result of a calculation is stored as a GIS file in either TAB or MIF format, the coordinate clause is used to generate output with the same coordinate system as the input GIS street database. In order to create TAB files, you will need MITAB.DLL installed on your system. Due to the status of the TAB file format (no public, official description), it will sometimes be possible that you encounter a TAB file or coordinate clause, which isn't handled properly by either function NWcreateTAB or MITAB library. At the moment only TAB files with custom affine coordinate systems are known to not be supported by NWcreateTAB.
SHP format
If the chosen output format is SHP, a PRJ file is not created. It is the responsibility of the programmer to copy the PRJ file from the original SHP street database to the new SHP file, if needed.
CGF format
This has no concept of coordinate systems.