This video demonstrates:

• Basic overlapping zone rules.
• How overlapping zone order influences optimisation.
• How to change zone order.
• Multiple zone prioritisation.

Transcript

In Grading Optimization, you can implement multiple zones in a project. They can be apart from one another, adjacent or overlapping. For this zone, we are creating an accessible zone overlapping a grading limit zone with a customised Maximum Slope Constraint of 5 per cent.

Zones in Grading Optimization are ordered by priority. In the Grading Objects Browser, zones listed at the top override constraint settings of all zones beneath them.

When we optimise this project, you can see that the slopes in the accessible zone are in the required range.

Now we will add a third zone to demonstrate a transition zone. This zone has a Maximum Slope Constraint of 15 per cent.

This larger transition zone is currently above the accessible zone. It will then override the Maximum Slope Constraint of the accessible zone which overrides the grading limit zone. You can see this in the violation view. The triangles show a Maximum Slope Constraint setting of 15 per cent instead of the 5 per cent that was set on the accessible zone.

Now when optimising is underway, you can see in the slope view that the accessible zone is no longer white. This indicates that it is too steep according to the slope settings.

We will now reorder the zones so that the accessible zone is above the transition zone.

The violation view now shows the setting of the accessible zone as 5 per cent on the red triangles. Now when we restart the optimisation, you can see slope changes when the elevation is exaggerated with the slider.

Understanding the prioritisation of the order of overlapping zones is important in finding a feasible optimisation solution for your projects.