Cannot Use Manually Created Junctions in Network Dataset

SZG909

Hi all,

I am trying to use a network dataset based on a custom road dataset for route analysis. However, when I built my network, many intersection's junctions were missing.

My solution was to create my own junctions data and manually import it into my network. I used the Intersect tool to create these junctions. I then imported the intersect points into my network feature class. However, when I create a network, there is the option to input my roads feature class under Source Feature Classes, but not my intersect points feature class.

How can I use these intersect points as junctions in my network?

 

 

Melinda Morang

Okay, thanks for the additional details.  That helps me narrow in on the problem.

The first problem you mentioned was that intersection junctions were missing in your network.  It sounds like that's the real problem, and any problems with adding a junction feature class to your network are secondary problems with something you're trying to do to correct the first.  Is that right?

The most common issue when creating a network with manually digitized roads relates to connectivity.  There are a couple of geometry problems and network dataset settings that can cause roads to be disconnected at intersections where they should connect:

1. Geometry problems - The digitized streets aren't snapped together at intersections.  There are little gaps and dangles, and the streets don't meet up neatly and cleanly at the intersection points.  To correct this, you need to edit the street features.
2. No vertices or end points at intersections - The digitized streets are long lines that cross other lines, but they don't have vertices or end points at the locations where they intersect.  These are treated as underpasses/overpasses instead of intersections.  You can run the Integrate tool to generate vertices at the intersection points (but make a backup copy of your data first because Integrate can mangle it).
3. Incorrect connectivity policy. The streets aren't connected at intersections because you're using End Point connectivity, but the street features don't end at intersections (they just have vertices).  You can fix this by switching to Any Vertex connectivity.  Documentation for connectivity: https://pro.arcgis.com/en/pro-app/latest/help/analysis/networks/understanding-connectivity.htm

When you build the network dataset, vertices should automatically be created at connected intersections.  If no vertex was connected, it means that the geometry and/or network dataset settings do not see that intersection as properly connected.

To help you debug the problem, try using the Explore Network tool to click on the street features near the problem area to see how they're connected (or disconnected).  Documentation for Explore Network: https://pro.arcgis.com/en/pro-app/latest/help/analysis/networks/explore-network.htm 

If none of that solves your original problem and you still want to include your own junctions in the network, you should be able to select a point feature class as a source feature class of the network in the Create Network Dataset tool or manually in the network dataset properties.  The point feature class must be in the network's feature dataset.