1. Introduction

The LAS to Control Manual Registration is a tool available in LP360 Land starting from v2024.2. The module can be found on the Tools ribbon section. LAS to Control manual registration requires "LP360 Land Standard" license or the "LP360 Land Standard" addon.

Control registration is a tool performing coarse alignment, in other words it performs a rigid registration where the user manually aligns a LAS to Control Points.

If you are looking for other types of registration, please check the article on LAS to LAS Auto registration or LAS to LAS Manual registration.

2. How to use LAS to Control registration

Before using LAS to Control manual registration, make sure that the control points are visible in the LAS. Translation requires a minimum of 1 Control Point, Rotation requires a minimum of 3 Control Points.
It is recommended to perform Translation and Rotation.

1. Import the GPS to LP360, you can use the "Import" tool from the "Control Points" ribbon
2. Open LAS to Control Registration tool.
3. Select the "Registered LAS Layer"
4. Select the "Features layer" (the control points shapefile)
5. Select a control point from the list
6. Press "Pick The Corresponding Point"

7. Measure the point in the point cloud
8. Press "Validate The Picked Point"

9. Repeat the process until you have multiple points measured
10. Select the registration correction type:
- Translation: always recommended.
- Rotation: recommended if you can identify multiple pairs of points spread around the point cloud.
- Scale: only for advance users. It can deform the 3D model if not applied properly.
11. Press "Solve", the tool will calculate the values to be applied to the registration
12. Review the registration values.
Note: If a point is not accurate enough the tool will warm the user
13. Press "Apply Corrections"

14. A new registered point cloud will be created in the table of content

3. Good practices

- Use at least 3 pairs of common points for translation (minimum required is 1).
- Use at least 6 pairs of common points for rotation (minimum required is 3).
- Spread the control points across the point cloud.
- Remember that the accuracy of the control points will affect the global accuracy of the LAS registered.