Total station survey

A total station survey is a digital surveying method in which selected points of a building are captured in three dimensions using a total station. The instrument measures angles and distances and uses them to calculate precise point coordinates. These coordinates provide the basis for as-built plans, CAD models and planning for existing buildings.

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Why is total station surveying important?

• Targeted geometry capture: Relevant building points such as corners, edges, openings and elevations are deliberately selected and measured precisely.
• Consistent coordinates: Position and elevation data are captured within a common coordinate system.
• Direct data processing: Measurement points can be processed in CAD systems during or immediately after the survey.
• Capturing complex existing structures: Non-rectangular rooms, changes in elevation and complex roof or façade geometries can be documented reliably.
• Greater planning certainty: Current measurement data reduces reliance on incomplete or outdated as-built plans.

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How does a total station survey work?

1. Set up the surveying system

The total station is positioned at a suitable location and integrated into a local or higher-level coordinate system. Reference and control points provide the basis for a consistent survey.

2. Measure building points

Relevant points are targeted individually with the total station. These may include:

• Wall and room corners
• Doors and windows
• Ceiling and floor elevations
• Façade edges
• Staircases
• Roof geometries
• Structurally relevant building elements

The total station measures horizontal and vertical angles as well as the distance to each point.

3. Calculate coordinates

The measurements are used to generate three-dimensional coordinates. Instead of measuring only an individual distance, the precise spatial position of each point is determined.

4. Verify the survey data

Control points and repeated measurements help verify positional accuracy and identify errors in the instrument setup or orientation at an early stage.

5. Process the data

The captured geometry data can then be used to create floor plans, sections, elevations or CAD models. Depending on the workflow, measurement points can be assigned directly to a digital drawing while the survey is still in progress.

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Typical applications

• Measured building surveys: Total station surveys are suitable for surveying existing buildings where precise position and elevation data is required.
• Renovation and conversion: In older buildings, existing plans often differ from the actual conditions. Points captured with a total station provide an up-to-date basis for planning.
• Complex building geometries: Angled walls, different elevations, roof structures and non-orthogonal floor plans can be captured selectively.
• Façades and external areas: The method is also suitable for capturing façade points, building edges and geometric reference points outside the building.
• Control and supplementary measurements: Total stations can capture individual points with particular precision, making them suitable for checking or supplementing other surveying methods.

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Quality criteria for a total station survey

• Clearly defined coordinate and elevation system
• Traceable instrument setup and orientation
• Sufficient number of relevant measurement points
• Documented control and reference points
• Project-specific accuracy requirements
• Structured assignment of measurement points for subsequent CAD or planning work

The decisive factor is not capturing the largest possible number of points, but selecting the right points for the specific application.

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Common mistakes and misconceptions

• Too few measurement points: Complex geometries are oversimplified and cannot be reconstructed reliably at a later stage.
• Unclear references: Errors in the instrument setup or coordinate system can affect the entire survey.
• Overlooking concealed areas: A total station requires an unobstructed line of sight to the point being measured.
• Idealising existing conditions: Non-rectangular walls or deformations should not be automatically straightened if they are relevant to the planning process.
• Relying on outdated plans: Existing documents can support the process, but they do not replace a current measured building survey.

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Total station survey vs. terrestrial laser scanning

Both methods capture buildings in three dimensions, but they differ significantly in how the data is collected.

Total station survey

• Captures specifically selected individual points
• Measurement points are deliberately chosen by the surveyor
• Comparatively compact data volumes
• Well suited to specific geometries, control points and complex individual measurements
• Direct CAD-based processing is possible

Terrestrial laser scanning (TLS)

• Captures surfaces extensively using a very large number of measurement points
• Generates a dense 3D point cloud
• Documents details that were not specifically selected during data capture
• Well suited to comprehensive digital surveys of existing buildings
• Produces larger data volumes that require corresponding processing

Which method is more suitable depends on the building, the desired result and the requirements regarding completeness and accuracy. Some projects combine both methods.

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Total station vs. laser distance meter

A laser distance meter primarily determines the distance between two points. A total station, by contrast, combines distance and angle measurements and uses them to determine the spatial coordinates of a measurement point.

This makes the total station particularly suitable for connected three-dimensional surveys rather than individual control measurements alone.

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FAQ