Data structure of network file

08-05-2012 01:51 PM
New Contributor
I want to write some python program to read the attribute of a established network. I found the ArcGIS can build a network very quickly and generate a folder of ??????Newtork_ND.nd with some files of ???.nds.

How does those files store the topological relation of network, like the connected edges and junctions?

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Esri Regular Contributor
The contents of the network dataset folder are in a binary proprietary format. However you can access the attribute information of a network dataset from python using the describe function. More here:

With 10.1 there are additional python functions for network analyst. You can read more about that here:

Jay Sandhu
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New Contributor
Hi Jay,

Thank you for your reply.

Is there a way that arcpy can read those attributes of a single edge of a network, just like the  [Network Identify Tool] can easily find the connected edges and junctions of any selected edge?


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