> For the complete documentation index, see [llms.txt](https://docs-7.phoenixlidar.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs-7.phoenixlidar.com/lidarmill-desktop/workflow-kk/camera-snap/phaseone-camera-calibration-with-aerial-datasets.md).

# PhaseOne Camera Calibration with Aerial Datasets

Since PhaseOne imagery requires pre-processing steps outlined here: [Phase One Preprocessing](/lidarmill-desktop/workflow-kk/uploading-files/imagery/phase-one-preprocessing.md), the imagery within Spatial Explorer will already have the lens distortion corrected in the resulting JPEGs.  Because of this, it is important to **DISABLE Lens Distortion** whenever conducting a camera calibration with PhaseOne imagery.  

Inspect the JPEGs output from IXCapture to ensure there are no areas of 'no-value' in the images (showing as a black wedge near the edge of frame).  If areas of no-value are seen in the undistored JPEG output from IXCapture, a receptor mask will need to be created to remove this section of each frame from the calibration and colorization steps.  The process to create a mask is outlined here: [Mobile Colorization Using Ladybug Imagery](/lidarmill-desktop/workflow-kk/colorization-of-point-clouds/mobile-colorization-using-ladybug-imagery.md).

As with other aerial data sets, **Individual Pose Correction (orientation)** is typically the most important feature to calibrate. All LiDAR systems are calibrated prior to leaving our production facility, and unless the camera has been physically removed from the system it's likely that the factory calibration for mounting rotations and receptor intrinsics is still valid. 

However the orientation of each image is determined by the trajectory, and the trajectory always has a degree of error. **Individual Pose Correction (orientation)** uses features detected in imagery to adjust the orientation of each image, resulting in improved colorization and more accurate camera poses (which can then be exported and used in 3rd party photogrammetry software). 

![Calibrating individual photo orientations. ](/files/TDPK7IZ7oiuqJOiG5C85)

{% hint style="info" %}
If colorization errors are apparent after photo pose correction, it may be advisable to calibrate the **sensor orientation**, as factory camera calibrations can be degraded by mishandling, shipping, and normal use over time.  Again, with PhaseOne imagery converted using IXCapture, **Lens Distortion** should **NOT** be calibrated in Spatial Explorer
{% endhint %}