The following are recommendations for control points placement:
Distribute control points evenly. Place them more than 5m apart from one another and ideally not in a straight line.
Place control points at the beginning and end of each scanned dataset.
Include a minimum of three control points per scanned dataset.
Place control points in corners, at the ends of corridors. Place one control point at every corner of a long corridor.
Control points should be placed at least 50 cm from corners. One control point every 25m. Wall control points should be 160-180 cm high.
There is no fixed rule for how many control points to use within a scanned dataset, it all depends on the building layout and use case, but typically placing control points every 25-50m is recommended.
For low complex halls, it is enough to calculate with 3 control points per 1000 m², while it can go up to 6 control points per 1000 m² for very complex, and fragmented environments in which many small datasets are necessary.
For the best point cloud accuracy like the examples shown here, we recommend positioning control points every 25 to 30 meters along the device's path.
Where to put control points in a long corridor
Where to put control points in a large open space
FAQ
What is the recommended distance between control points?
Control points should be placed more than 5 meters apart from one another.
How many control points should be included in each scanned dataset?
A minimum of three control points should be included per scanned dataset.
Where should control points be placed in a long corridor?
Control points should be placed at every corner of a long corridor and at least 50 cm from the corners.
Is there a fixed rule for the number of control points needed?
No, there is no fixed rule; it depends on the building layout and use case, but typically placing control points every 25-50 meters is recommended.
How many control points are needed for low complex halls?
For low complex halls, it is sufficient to use 3 control points per 1000 m².