Surveying & 3D
3D models of buildings — practical use cases
With drones and photogrammetry, a building or facility can be turned into a photorealistic, measurable 3D model — a digital copy that can be opened, rotated and measured at the office. The model captures the entire exterior of the object in a single delivery and is used for everything from damage surveys and design to management records and communication.
Concrete use cases
- Damage and condition surveys — damage documented during an inspection can be located and measured directly in the model: how large is the crack, where on the facade is it, how many square metres of render are damaged?
- Design and tender material — architects and contractors get correct measurements of facade areas, roof pitches and details without site visits and manual measurement.
- Quantity take-off — areas for painting, rendering or re-roofing are measured from the model as a basis for estimates and quote comparisons.
- Solar panel design — roof areas, pitches and shading objects provide the basis for layout and production calculations.
- Management records — a dated digital copy of the building’s condition, useful as a reference for future maintenance planning and disputes.
- Heritage documentation — detailed documentation of older and listed buildings ahead of renovation.
- Communication — a rotatable model makes it easy to show a board, client or contractor exactly what is meant.
What determines the model’s quality?
- Image coverage — all surfaces to be modelled must be photographed from several angles; obscured areas (recessed sections, dense vegetation) leave holes in the model.
- Resolution (GSD) — determines which details can be distinguished and measured. See How accurate is drone surveying?
- Georeferencing — RTK/PPK and control points determine whether the model is merely true to scale or also correctly positioned in a coordinate system — important when the model is to be combined with design or map data.
- Surface characteristics — glass, shiny metal and uniformly coloured surfaces are difficult for photogrammetry and may require supplementary handling.
The technology behind it is described in more detail in What is photogrammetry?
Delivery formats and use
| Deliverable | Typical use |
|---|---|
| Textured 3D model (mesh) | Visualisation, measurement, damage surveys |
| Point cloud | Input for CAD/BIM design |
| Orthophoto of roof/ground | Planning and area measurement |
| Facade views (orthoprojections) | Facade drawing base and damage mapping |
| Web sharing of the model | Review without specialist software |
The format is chosen to suit the recipient’s workflow — a property manager often wants a shareable web view, while a designer needs point clouds or CAD-compatible formats. See the 3D mapping service.
When is a 3D model the right choice — and when are images enough?
A 3D model is justified when measurements and the whole picture are needed: design work, quantity take-off, a complex damage situation or documentation to be reused over time. For a simpler condition check, a systematic image delivery from an ordinary roof inspection is often sufficient — at a lower cost. A serious provider helps you choose the level based on the need, not on what is most advanced.