Troubleshooting: How to fix the colorization in a TrueView project

📌 Problem

When working with data captured using a TrueView sensor, you may sometimes notice that the colorization produced during geocoding is not accurate. Typical symptoms include:

• Colors appearing shifted relative to the LiDAR intensity.
• Colors that do not align correctly with features in the point cloud.
• Inconsistent or mismatched color patches in certain areas.

🔍 Root Cause

These issues usually occur due to small inaccuracies in the photo geolocation or calibration parameters used during colorization.

The following methods can help recolorize the point cloud and improve color alignment.

🧠 What is...

There are multiple ways to colorize a point cloud, remember that the colour is not a native property of a point cloud. It comes from the camera. Small errors during data collection creates the mismatch between the images and the point cloud.

✅ Probable Resolutions

Resolution 1: Recolorize using Strip Align

(Applicable to all TrueView sensors except TV539 and TV540; requires Strip Align license)

This method refines the photo geolocation through strip alignment, which improves the accuracy of the colorization process.

1. Run Strip Align on the dataset.
2. During the configuration:
   • Enable Update EXIF Tags.
   • Enable Recolorize.
   • Execute the strip alignment process.

Result: the Strip Aligned LAS is colorized with a more accurate colour since the geolocation of the photos has been updated.

Resolution 2: Recolorize using a Colorize Point Cloud

(Applicable to all TrueView sensors, requires 3D Photo license)

This method uses photogrammetric bundle block adjustment (BBA) to improve camera calibration and positioning.

1. As a pre-requisite, you must enable Update EXIF Tags in the initial Geocoding step.
2. Navigate to Photo tab --> Colorize Point Cloud
3. Photo Inputs --> Select "RetainedPhotos_CXXXX_XXXX"
4. Select the settings:
   • Enable Bundle Block Adjustment (BBA)
   • Update Camera Calibration

   • Apply a priori EO if BBA

     

5. Next, point cloud --> Select the LAS layer to recolorized
6. Products --> Check "Colorize LAS Layers" --> Create NEW LAS Layer. Give a name, for example, "LAS_New_colorization".

7. Submit project.

   

Resolution 3: Recolorize using a Orthomapping or Agisoft Orthomapping

(Applicable to all TrueView sensors, requires Photo or Agisoft Orthomapping license)

This method uses photogrammetric bundle block adjustment (BBA) to improve camera calibration and positioning.

1. As a pre-requisite, you must enable Update EXIF Tags in the initial Geocoding step.
2. Navigate to either: 
   1. Option 1: Orthomapping --> Input layer type -->Images (Photo Layers)
   2. Option 2: Agisoft Orthomapping
3. Select "Photos_CXXXX_XXX"
4. Open Advanced Options.
5. Enable Update Sensor Calibration.

6. Select BBA Only Processing
    

   

7. Run the processing.

8. After processing completes, select the correct cycle.
    

   

9. Run the Colorize tool.
    

   

Result: The geocoded LAS file (LAS_CXXXX) has been regenerated with the improved colorization.

Resolution 4: Recolorize using an orthophoto

(Applicable to any sensor or LAS, requires LP360 Drone license)

Use the Colour by Image tool to recolorize any LAS layer from an orthophoto.

📬 Need Help?

If you're still stuck, please Contact Support for assistance.