The Merge Centerlines tool is one of the centerline editing tools available in ArcGIS Roads and Highways. This tool helps reduce segmentation in centerlines by merging them together on the basis of the common route ID shared by them.
You should not use the Merge tool on the ArcMap Editor toolbar to merge centerlines. Instead, you should use the Merge Centerlines tool on the Roads And Highways Editing toolbar. This tool ensures that when centerlines are merged, the source centerline's association to routes in all networks across all time is maintained and that the centerline's segmentation resulting from route definitions is honored.
| Network | Route | Centerline before merge | Centerline remaining after merge |
|---|---|---|---|
A | 1001 | 1, 2, 3, 4 | 1, 4 |
B | 2001 | 1, 2, 3 | 1 |
- In ArcMap, add the centerline and the network layers to the map.
- Start an edit session and zoom to the centerline you want to merge.
For more information on how to start an edit session, see About edit sessions.
- Use the Edit tool
on the Editor toolbar to select the centerlines to merge.The ArcGIS Roads and Highways Merge Centerlines tool
will merge centerlines that are selected in ArcMap. You can use any of the ArcMap selection tools to select centerlines to merge.The selected centerlines are highlighted in cyan.
- Click the Merge Centerlines button on the Roads And Highways Editing toolbar.
Centerlines can only be merged to the granularity of route definitions. If some centerlines don't merge, it is likely because there is a route in a network or time span that disallows it. This behavior is intended.
The centerlines are now merged on the basis on their common route ID.
