Intersection count

[AnnaKenyon1]

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.

[DuncanHornby]

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]

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!