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I want to create a new network dataset from a street layer. Should I create it in a normal file or in a personal geodatabase?

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    What do you mean, "normal file?" – GISKid Jul 23 '14 at 19:50
  • well, not in a geodatabase. It seeems to work but I wanted to know if its better to do it in a geodatabase or not. – Charles-David Babin Jul 23 '14 at 20:21
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A network dataset must reside within a feature dataset. A feature dataset can be created in either a file geodatabase (folder.gdb) or a personal geodatabase (filename.mdb). You can't create one in a shapefile, if that's what you mean by 'normal'. Note you'll need to add the street layer to the network dataset in order to build a network from it, and there may be some cleanup necessary/involved in building a useable network. You may want to run through this ArcGIS help tutorial.

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