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Accuracy Star

LP360 Support
  • Updated

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Requires an LP360 Geospatial Basic or higher, or the 3D Accuracy add-on for LP360 Drone or Land Standard license. 

Accuracy Star

Before working with the Control Points Report dialog, ensure the Type column of your Control Points is correctly imported. 

Auto Find

Auto Find the Accuracy Stars in the point cloud and compare to the GCP's.

Note

The Control Points Report will be run on the Active LAS Layer.

ActiveLASLayer.png

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Settings:

Intensity Coefficient:

The proportion of the points that will be used based on intensity.

Tripod Height:

The approximate measurement from the ground to the base of the tripod where it is installed on the Accuracy Star. It is recommended to use a value lower than the height of the accuracy star relative to the ground.

  • Calculate DX, DY, DXY, DZ, and DXYZ
  • Calculate statistics
  • Generates comments on Auto Find results

Noise and Density

Quality Indicators of the Accuracy Star Center Estimation

Comments Meaning or Explanation
Reliable results GCT is correctly estimated.
Noise warning The estimated GCT center could be used for point cloud correction. Check consistency of computed offset with other GCT if possible.
Noise alert Estimated GCT center location must not be used for point cloud correction. Check reference GCP position and vertical offset of GCT with respect to GCP.
Low density warning Estimated GCT center should not be used for point cloud correction. Use if computed offset is consistent with other GCT/GCP offsets. Check reflector description within point cloud.
Low density alert Estimated GCT center location is not reliable for point could correction. Accuracy Star description within point cloud is not good enough.
Not useable GCP neighborhood does not contain any Accuracy Star.
Not enough points GCP neighborhood does not contain enough points.
Not enough detected reflector points GCP neighborhood does not contain enough reflector points.

Reflector Identification

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Solve

The Solve option:

  • Calculates translation
  • Calculates rotation (if at least 3 Accuracy Stars)
  • Auto Solve will automatically recalculate if you check or un-check GCP in the list

Note

If the translation is combined with a rotation, the rotation is defined from the origin point (Ox, Oy, Oz). The translation is also relative to this origin point.

 

Apply Correction

Apply Correction will apply the translation and rotation on the point cloud and create a new LAS layer.

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