The determination of scanner positions is a key stage of office processing. The calculations known as “registration” combine individual scans into a unified point cloud. We have developed our own software based on proven geodetic methods. We apply least squares adjustment and an indirect method in which entire scans are transformed as rigid bodies. The transformation fulfills the condition: ∑_i=1ⁿ p_i v_i² → min The computations are based on identifying identical elements within different scans, such as a building corner (XY) or a rail head (Z).

By measuring a sufficient number of tie points between scans, we create a dense connection network. The computations involve shifting and rotating the scans so that the connections optimally satisfy the condition pvv = minimum. At this stage, we maintain full control over the process. We can detect outliers, analyze error sources, and evaluate the quality of control points.

Error ellipses are an essential element in assessing calculation quality. They indicate the level of confidence in the computed scanner coordinates. The optimal situation occurs when the ellipses are small and close to circular. If they become too large, we analyze the cause and take corrective actions. This geodetic approach ensures full control over accuracy and final result quality.

The point cloud forms the foundation for all subsequent deliverables. Errors introduced at this stage will propagate to every further phase of the project. Therefore, we place special emphasis on quality and computational accuracy already during the registration process. More...