Reprojecting a Processed Point Cloud

Reprojecting an existing processed point cloud allows you to transform the dataset into a new horizontal and vertical coordinate reference system (CRS) without reprocessing the raw scan data. This is useful for correcting projection metadata, aligning data from multiple sources, or converting ellipsoidal heights to orthometric heights using standard or your own geoid models. Follow the steps below to reproject a processed point cloud in Aura.

What you will need

• A processed point cloud or trajectory loaded in Aura.

• The target horizontal and vertical coordinate reference systems.

• (Optional) A custom geoid file (GTX or TIF) if not using a predefined vertical CRS.

Procedure

Step 1: Open Aura Export Reprojection

1. Open Emesent Aura and go to the Visualize tab.

2. Load the processed point cloud or trajectory you want to reproject.

3. Click the Project menu icon, then select Export reprojection.\

Step 2: Review or Edit the Source CRS

Aura automatically detects the CRS, but editing may be necessary if the CRS is incorrect or the dataset includes multiple sources. To edit the source CRS.

1. In the Export Reprojection dialog box, click Edit Source CRS.

2. Refer to the Context Panel on the right to view the projection information of the current point cloud.

3. Alternatively, toggle on Custom target coordinate reference system to manually enter a PROJ string describing the desired CRS.

Step 3: Select the Target CRS

1. From the Horizontal dropdown, select a predefined coordinate reference system (CRS) from the list.

2. Once the Horizontal CRS is selected, the Vertical CRS dropdown becomes active.

3. From the Vertical dropdown, select a predefined vertical CRS, or click Import geoid file to upload a your own geoid file (GTX or TIF).

4. Alternatively, toggle on Custom target coordinate reference system to manually enter a PROJ string describing the target CRS.

Step 4: Apply Optional Reprojection Settings

1. Enable Reproject trajectory to apply reprojection to the associated trajectory data.

2. Enable Replace loaded point cloud with exported reprojection to automatically load the newly reprojected point cloud into the Visualize tab.

Step 5: Export the Reprojected Point Cloud

1. Click Save to export the reprojected point cloud.

2. The results are good saved in the same output folder as the original point cloud.

Outcome

The processed point cloud is transformed into the selected target CRS and saved to the same output folder as the original point cloud. If Replace loaded point cloud with exported reprojection was enabled, the reprojected point cloud is also loaded into the Visualize tab.