Calibration Scoring

This guide is designed to help you interpret the calibration transparency metrics. These properties provide a "look under the hood" at how accurately your anchor markers are being processed, allowing for more precise troubleshooting and data validation.

To learn how to properly calibrate height photos refer to the Classifying, Calibrating & Marking Up Photos guide or check out our Data Processing Training unit. 

Collinearity Score

The Collinearity Score measures the horizontal precision and the "straightness" of your calibration points.

What it represents:

This metric quantifies how closely your calibration points fall along a single, straight line (the "stick"). A score approaching 1.0 means all points are perfectly collinear. A lower score indicates that the points are deviating from the center line.

How to use it:

• High Score: Your calibration points are centered and the physical "stick" or alignment tool is straight
• Low Score: This indicates "horizontal noise" or physical bending.

Action: Check if the height stick is bent or if anchor calibration markers are misplaced in the photo. If needed, delete the incorrect calibration marker and use the "anchor calibration" input to accurately calibrate the photo. 

Alignment Score

The Alignment Score measures the vertical accuracy of your anchor calibration.

What it represents:

This score indicates how well the software can reconcile the marker’s detected position with the expected vertical model. It is a measure of reprojection error—the difference between where the marker should be and where it was actually found in 3D space.

How to use it:

• High Score (0.995 - 1.0): Your marker is vertically stable and accurately placed. Calibration markers will display green.

• Low Score (0.99 - 0.995): This suggests a slight discrepancy in height. Calibration markers will display yellow.

• Bad Score (0 - 0.99): This suggests a significant discrepancy in height. Calibration markers will display red.

Action: For markers with a score less than 0.995 (yellow or red) check if the anchor marker has been physically moved, or if the heights entered initially are incorrect. As needed, delete any incorrect calibration markers and use the "anchor calibration" input to calibrate the photo in the correct place.