---
title: "IVION Processing Checks of the Control Point File"
slug: "ivion-processing-checks-of-the-control-point-file"
tags: ["Alignment Check", "Control Point Files", "Coordinate System", "POSES", "Processing Checks", "Quality Control"]
updated: 2026-02-23T12:11:34Z
published: 2026-02-23T12:11:34Z
---

> ## Documentation Index
> Fetch the complete documentation index at: https://knowledge.navvis.com/llms.txt
> Use this file to discover all available pages before exploring further.

# IVION Processing Checks of the Control Point File

> [!NOTE]
> Note: 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](/v1/docs/clone-control-point-file-requirements-and-formats).

After uploading the surveyed control point file, IVION will perform an alignment check between the recorded control points and the uploaded surveyed control points. The check includes:

- A notification if any lines from the uploaded control point file that cannot be recognized. The warning is marked in yellow.

![Configuration settings for point cloud processing with an error message highlighted.](https://cdn.document360.io/bf174766-fa1a-4fe1-a4d7-b1db1e7cb996/Images/Documentation/image-20260112-160545.png)

- 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.

![Configuration settings for point cloud processing with highlighted control point error message.](https://cdn.document360.io/bf174766-fa1a-4fe1-a4d7-b1db1e7cb996/Images/Documentation/image-20260112-160757.png)

Example: Control Point “BXK“ was captured, but not found in the uploaded file.

![Processing task showing control points with one missing and residual values listed.](https://cdn.document360.io/bf174766-fa1a-4fe1-a4d7-b1db1e7cb996/Images/Documentation/image-20260112-160909.png)

> Note: The residual signifies the difference between the recorded data and the coordinate details supplied in the uploaded surveyed control point file along the X, Y, and Z axes.

- Warning if certain control points have a large alignment error.

![Settings for point cloud processing, highlighting misaligned control points warning message.](https://cdn.document360.io/bf174766-fa1a-4fe1-a4d7-b1db1e7cb996/Images/Documentation/image-20260112-161756.png)
  - IVION will only show the warning in yellow, if the alignment error is over 10 meters.

![Control points for processing with misalignment warnings and residual measurements displayed.](https://cdn.document360.io/bf174766-fa1a-4fe1-a4d7-b1db1e7cb996/Images/Documentation/image-20260112-161606.png)

### 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: ![](https://cdn.document360.io/bf174766-fa1a-4fe1-a4d7-b1db1e7cb996/Images/Documentation/CPfile6.png)

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: ![](https://cdn.document360.io/bf174766-fa1a-4fe1-a4d7-b1db1e7cb996/Images/Documentation/CPfile7.png)

---

### FAQ

#### What are control point files?

Control point files contain the surveyed coordinates of the control points added from a total station and captured with the NavVis device.

#### What happens after I upload a surveyed control point file?

IVION performs an alignment check between the recorded control points and the uploaded surveyed control points.

#### What does a yellow warning indicate during the alignment check?

A yellow warning indicates that certain lines from the uploaded control point file cannot be recognized.

#### What does a red warning signify?

A red warning signifies that any control points from the scan cannot be found in the uploaded control point file.

#### 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 large alignment error.

#### What is the importance of the right-handed coordinate system in IVION Processing?

IVION Processing requires control point coordinates in a right-handed coordinate system to ensure accurate alignment.

#### What should I do if my coordinates are in a left-handed coordinate system?

If you receive a warning about a left-handed coordinate system, you can confirm if your coordinates are right-handed; if not, click 'Okay' to adjust them.

#### Can I download the corrected surveyed control points after processing?

Yes, after processing, you can download the corrected 'Surveyed control points (.csv)' directly from the processed data.