ALRS Networks

An ALRS is constructed by combining a centerline feature class, a route table, a cross-reference table, and calibration points to generate dynamic route layers called LRS Networks. The ESRI Roads and Highways Service Pack 3 provides the functionality of upgrading an advanced linear referencing system (ALRS) by converting LRS Networks into feature classes whose shape is derived from centerlines and centerline sequence table.

Upgrading ALRS from a Roads and Highways pre service pack 3 database

After the installation of Roads and Highways service pack 3, an ALRS crearted using the previous version of the software needs to be upgraded. If you get an error message like this:

Error message for upgrading ALRS

then right-click the ALRS in ArcCatalogand select Upgrade ALRS. The dynamic LRS networks will be converted into polyline MZ enabled route feature classes as a result.

Upgrading ALRS


If you need to edit the route feature classes, then you should use the Roads and Highways Editing tools to make the changes.

Also see: Roads and Highways Editing Toolbar

After making changes in the routes, you need to regenerate them. This can be achieved by two means.

  1. By right-clicking the updated LRS layer and then selecting the Generate Routes option.
    Regenerating Routes
  2. By using the Generate Routes geoprocessing tool. Also see: Generate Routes using a geoprocessing tool.