PTV Visum - Frequently Asked Questions (FAQs)
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The dialog ''Select spatial reference system'' only appears by reading a network file and not by reading a shapefile.
It ist not defined where the group $Network settings, in which the declaration for the spatial reference system is contained, stands in a network file. That is why Visum asks the spatial reference system before.
With a SHP-file, this may not always be necessary because the spatial reference system could be defined in the belonging PRJ-file.