Existing site survey

Survey terrain and position reference on the existing site as the basis for demolition/new build or conversion strategies.

Starting point

• Decisions on demolition, new build, or conversion need reliable terrain and position information.
• Without a shared reference frame (LV95) and an up-to-date survey, discipline models diverge.

Goal & benefit

• Provide terrain and reference points early and traceably.
• Compare options on the same spatial basis.

Process

1. Provide terrain and at least three reference points according to the surveyor delivery in LV95.
2. Capture a colour point cloud if possible and align it with the terrain model.
3. Set project-specific effort depth and check deliverables.

Outcome

• Shared position and height reference with documented terrain for strategy choice.

Deliverables

• Architecture model with IfcProject, IfcSite, IfcBuilding, and survey reference points (IfcBuildingElementProxy)
• Terrain as surface geometry (IfcGeographicElement TERRAIN) in LV95
• Terrain survey and control points in LV95
• Point cloud recommended in colour; alignment with terrain model
• Project-specific effort depth