IVION Processing Control Point File Requirements and Usage
Control point files contain the surveyed coordinates of the control points you added from a total station and then captured with the NavVis device. Refer here for the specific requirements and formats for surveyed coordinates.
IVION Processing Checks the Control Point File
After uploading the surveyed control point file, IVION will first perform an alignment check between the recorded control points and the uploaded surveyed control points. The check includes:
A notification if certain lines from the uploaded control point file cannot be recognized. The warning is marked in yellow.
A notification is displayed if any control points from the scan cannot be found in the uploaded control point file. The warning is marked in red.
Example: Control Point “3“ was captured, but not found in the uploaded file.
Warning if certain control points have a large alignment error.
IVION will only show the warning in yellow, if the alignment error is over 10 meters.
Example: Control point that has a large alignment error over 10m.
Left-/ Right-handed Coordinate System Check
In IVION Processing we need the control point coordinates in right-handed coordinate system.
Sometimes, by swapping the left-/right-handed coordinate system (x & y columns), the alignment error will decrease. In this case, a warning will display that the uploaded control point file could be in a left-handed coordinate system. For example:
Double check on your surveyed control point coordinates, if you are sure the coordinates are measured in right-handed coordinate system, click Undo.
If the surveyed control point was indeed in the left-handed coordinate system, and the above warning displayed, click Okay and IVION processing will automatically use the adjusted right-handed control point coordinates.
After the processing, you can download the corrected “Surveyed control points (.csv)“ directly from the processed data:
Point Cloud Settings
While uploading data, the following Point cloud settings are available for data captured with NavVis M6, NavVis VLX and NavVis MLX.
Point cloud resolution
Point cloud color
The following point cloud settings are only available for data captured with NavVis VLX and NavVis MLX:
High Confidence: In this mode only points with high confidence are retained and regions that have not been scanned densely are removed. This mode is recommended for narrow indoor environments.
Standard: This mode is for general use and yields high-quality point clouds in a wide range of scenarios. This mode is recommended for larger indoor environments.
Outdoor: In this mode points from sparsely scanned areas are retained. This mode is recommended for outdoor environments.
The following point cloud settings are only available for data captured with NavVis M6:
Sharp Edges (default): This mode produces point clouds with details and edges in the scanned area reconstructed with a low amount of smoothing during filtering. However, the point cloud may contain noise and rough-looking surfaces.
Balanced: This mode is a balance between smooth surfaces and sharp edges. The point cloud might contain more noise on surfaces than smooth-surfaces mode, but will have sharper edges.
Smooth Surfaces: Surfaces will appear smooth and with a low amount of noise, but edges will appear less sharp compared to other modes. The point clouds will contain the lowest amount of noise with this mode.
Panorama Settings
The following panorama settings are available for data captured with NavVis VLX and NavVis MLX.
Floor filling: colorizes the device’s blind spot where the operator is standing
Note: The floor filling toggle is on by default.
Include panoramas in
.e57Point cloudNote: Turn on this toggle if you want to export a point cloud with panoramas directly from IVION processing.
FAQ
What are control point files used for in IVION processing?
Control point files contain the surveyed coordinates of control points added from a total station and captured with the NavVis device.
What happens if IVION cannot recognize lines from the uploaded control point file?
A notification will be displayed in yellow if certain lines from the uploaded control point file cannot be recognized.
What does a red warning indicate after uploading a control point file?
A red warning indicates that some control points from the scan cannot be found in the uploaded control point file.
Is it necessary to use a right-handed coordinate system in IVION processing?
Yes, IVION requires control point coordinates to be in a right-handed coordinate system.
Can I include panoramas in the exported point cloud from IVION processing?
Yes, you can include panoramas in the .e57 point cloud by turning on the appropriate toggle during processing.
What does the 'High Confidence' mode do in point cloud settings?
The 'High Confidence' mode retains only points with high confidence and removes regions that have not been scanned densely, recommended for narrow indoor environments.
What is the default panorama setting in IVION processing?
The default panorama setting includes floor filling, which colorizes the device’s blind spot where the operator is standing.
What should I do if I receive a warning about a large alignment error?
If the alignment error is over 10 meters, a yellow warning will be displayed, indicating a potential issue with the control point alignment.