Creating a T-Junction Does Not Route Successfully

MinxueChen

Dear Experts,

I was trying to create a T-Junction in my network. But it didn't work. Here is how I created it:

1. Got a street with several vertex:

2. Create a new street from one of the vertex (Snapping had turned on):

3. Give the new street proper F and T_ZLEV value (both are 0), which are the same as the existing one:

4. ND connectivity property set to "Any Vertex":

5. Build and run a Route:

The Network Identify Tool also shows that this newly created street do not have adjacent edges.

However, if I create a T-junction, but connect to a Junction Point, instead of Vertex Point, it will work.

Besides, if I create a X-junction, crossing a Vertex Point, it work too.

Is there anything that I'm missing here?

DougKampe

OMG, I spent days looking for a solution and setting the intersecting elevation fields to null was it. If you live in the Baltimore area I owe you a beer! I really like ESRI's attempt to provide good documentation, and generally they do a good job, but sometimes it misses small crucial details. This is one of them. ESRI, if you're listening, please update the Understanding Connectivity and Modeling Elevations help pages here to make this clearer:  http://desktop.arcgis.com/en/arcmap/10.3/guide-books/extensions/network-analyst/understanding-connectivity.htm

 

I'm going to add to this discussion because I'm in the middle of building a multi-modal pedestrian network (2 groups.) The sources are group 1 - Sidewalks (any vertex connectivity), group 2 - roads (endpoint connectivity), and a custom junction point layer (roadMeetsSidewalk) that overrides the connectivity rules in both groups. The “building a multi-modal network” documents don’t completely describe how to build one from scratch. Here are some additional tips I can provide. 

 

• If you have road A vertex intersect road B vertex, you can use a junction to override the endpoint connectivity.
• In my network, if road A endpoint ends with road B vertex, I still have to use a junction to override the connectivity rules, but I must put the road A elevation to null.
• If you have the vertex of a sidewalk layer (described above) intersect the vertex of a road vertex a junction can also provide connectivity between both groups.

 

The reason why I’m going into this much detail with this is the high level of complexity that goes into building a multi-modal network, and I’ve found it won’t work without adhering to these tips.