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Check point cloud accuracy in 3Dsurvey

Check point cloud accuracy in 3Dsurvey

How to Check Point Cloud Accuracy in 3Dsurvey

Introduction to Accuracy Assessment

In this 3Dsurvey tutorial, we’ll cover how to quickly check the accuracy of your 3D point cloud by comparing it with independently measured checkpoints collected via an RTK GPS rover.

Importing GPS Checkpoints

To begin, import your checkpoints from the GPS rover. Go to Data -> Load CAD and select the TXT file with the GPS checkpoint positions.

Measuring Height Differences

To verify point cloud accuracy, measure the height difference between the GPS points and point cloud. Access the CAD Tools menu, select the Ruler tool, disable the 3D distance option, and choose Height. Clicking on the point and moving your cursor allows you to measure the height difference. Right-click to mark the point and save the measurement.

Interpreting Results for Survey Grade Accuracy

For survey-grade accuracy, aim for a height difference of 4 cm or less between checkpoint and point cloud points. In our case, the accuracy for both checkpoints is around 2 cm, verifying that our point cloud achieves survey-grade precision.

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