Road Profile Control gives you manual, location-specific control over where Level AI places sawtooth high and low points. It complements the automatic Sawtooth Control settings — use it when you need to pin a high or low point at an exact location.
What is Road Profile Control?
A Road Profile Control is a drawable Roads feature (a polyline). Where the line crosses a road centreline, it forces Level AI to place a sawtooth low point or high point at that crossing when it optimises the road profile.
This is useful when you already know where a profile crest or sag needs to be — for example to direct surface runoff toward a particular inlet, to set a high point at a ridge or property boundary, or to control where roads sag for drainage.
Road Profile Control only takes effect when Saw-tooth roads on is enabled in your project's Road Settings. If saw-tooth roads are off, the control lines are ignored.
How to add a Road Profile Control
1. Add a Road Profile Control feature from the Roads feature group (it draws on the AS-ROAD-PROFILE-CONTROL layer).
2. Draw the polyline so that it crosses the road centreline at the location you want to control. Each crossing becomes a forced high or low point.
3. Set the Type attribute on the feature to choose whether the crossing is forced to a low point or a high point (see below).
4. Run Level AI. The road profile will be optimised with a sawtooth point at each crossing.
Type attribute
Type | Effect at the centreline crossing |
SAWTOOTH LOW (default) | Forces a sawtooth low point on the road profile where the line crosses the centreline. |
SAWTOOTH HIGH | Forces a sawtooth high point on the road profile where the line crosses the centreline. |
Related
Road Settings — enable saw-tooth roads and tune the automatic Sawtooth Control settings.