Intersection count

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08-05-2011 01:59 AM
AnnaKenyon1
New Contributor
I have downloaded the Integrated Transport Network (ITN) layer for UK roads.  I want to identify and count the number of true (at least three legs) intersections.  Any suggestions?  Thanks.
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2 Replies
DuncanHornby
MVP Frequent Contributor
Anna,

You want to assign each node in the network it's "valency".

I'm assuming you've used productivity suit to import the data into a file geodatabase?


  1. Do a spatial join using the geoprocessing tool of roadlinks (RdLk) intersecting nodes (RdNd) setting join operation to JOIN_ONE_TO_MANY

  2. This creates a dataset with a row for each polyline intersecting a node

  3. You can then use the Frequency tool or summary statistics tool to count TARGET_FID, this will count the number of times a node was selected.

  4. This gives you a table where for each OBJECTID (refered to as TARGET_FID) has a count.


Duncan
LauraMacdonald1
New Contributor

Thank you so much Duncan! I've been trying to work out how to do this for a while and I finally got it to work using your instructions!