A note about the comments regarding removing centerline geometry duplication in Roads and Highways as it relates to route concurrency (overlapping route geometry) and route dominance. Although my reply does not necessarily address the original GeoNet question, I do want to bring to the community’s attention the relative importance in de-duplicating centerlines in Roads and Highways for ALRS networks where route dominance is configured. For this example, I present to you four routes where the concurrency rules are set such that the greater, alphanumeric Route ID is the dominance rule.
Example 1: Routes “zRoad” and “aRoad” are concurrent. Each route has its own centerlines and those centerlines overlap in the highlighted region below (not de-duplicated):
Here is the corresponding centerline sequence table for Example 1:
Example 2: Routes “xRoad” and “bRoad” are concurrent. Each route shares the middle centerline where they overlap in the highlighted region below (de-duplicated):
Here is the corresponding centerline sequence table for Example 2. Note the yellow highlighted records represent the concurrent centerline segment:
Now, suppose we need to run the Calculate Route Concurrencies GP tool to calculate and report the concurrent route segments within the LRS Network and determine what routes are dominant for a given section of roadway. Here is what the output of the GP tool should look like for Example 2:
In this example, the GP tool traverses the centerline sequence table to determine routes in networks that share centerline sections and based on the configured network concurrency rules determines what the dominant route is along the concurrent section (re: DominantFlag). However, without de-duplicating centerlines for Example 1, the output result from the geoprocessing produces an empty recordset:
Finally, running the Remove Centerline Geometry Duplication utility on the ALRS and then re-running Calculate Route Concurrencies GP yields this result for Example 1 and Example 2:
The moral of the story here is that no matter why or when you introduced centerline geometry duplication into your ALRS, if you have overlapping/concurrent route definitions you really need to be cognizant that route dominance depends of keeping your centerline sequence table nice and tidy. Hope that helps!
amit@esri
roads and highways team