Create a Realignment Optimization Job: Realignment

Realignment jobs are useful when sections of an existing road or railway line can be maintained and re-used for the project. Examples of this would include upgrading existing infrastructure and road widening or geometrical improvements.

Steps to complete before creating a Realignment job

1. Position the start and finish points so that they lie on top of the realignment feature.

2. Adjust the grade and bearing of the start and finish points so they are the same as those of the selected feature.

3. Remove any construction or vertical crossing constraints from the selected realignment feature.

4. Ensure that the feature in which you are realigning is one continuous single feature. If it is made up of several sections, use the Join Linear Feature tool to make it one complete object, see Joining two features.

Tip: The easiest way to remove constraints is to make the feature inactive.

Create a Realignment job

1. Create a job as described in Unseeded Optimization. In Step 2, choose Realignment.

2. From the list in the Type field, select the type of realignment:

Footprint

Choose this to realign old roads where the geometric standards no longer meet modern requirements and/or the state of repair of the existing road means that the new road has to be all new. The primary concern is to minimize the area of new land required.

Centerline

Choose this option to realign railways in a way that maximizes the reuse of existing lines; this makes the vertical component important. Set a horizontal and vertical margin that will qualify the old alignment as being reused. Reused sections of track do not incur costs.

1. If you selected Centerline, set the horizontal and vertical margins. If the centerline of the generated alignments falls within the H and V margins the system assumes that it is using the existing infrastructure. When reviewing the realignment results Quantm Desktop will only show new pavement/rail outside of these values.

2. Click the feature that is to be realigned in the Plan view.

3. Complete Step 3 through Step 5 in Unseeded optimization.

Next topic: Submit a Job