The point Cloud Accuracy can be defined in several ways. Just like BIM models that are classified into 5 categories based on details provided in the model, the point cloud coming out of the scan can also be classified into 5 Different Levels of Accuracy:
Other way to classify the accuracy of point cloud is based on the precision and correctness.
The precision component describes the bandwidth of repeated statistically-independent measurements under identical conditions and is mainly defined by the random deviations (e.g., measurement noise) of a sensor.
In contrast to the precision component, the correctness of a measurement is mostly influenced by systematic deviations (e.g., due to mis-calibrated equipment, bad angles of incidence or effects resulting from the object’s surface).
Good accuracy values can only be obtained if both the precision and the correctness components have little, if any, influence. The accuracy, therefore, consists of both precision and correctness and describes the accordance of a measurements result regarding the true value.
Also, the one more way check the quality of the point cloud is the point spacing.
1. Station Based Scanner- Trimble TX8, Trimble TX 6, Faros Focuss and Faro Focusm
2. Mobile Scanner- Geo Slam Zeb Revo
Ideal for the Pro-Active Project Management. Great for identifying the installations. Ideal tool for Project Management and for keeping the track of construction progress