GCP Orientation Troubleshooting
3Dsurvey simplifies the geo-referencing and orientation of survey projects, 3D models, and more, offering built-in support for over 5,000 global coordinate systems. With complex coordinate structures, selecting the correct system and parameters is essential to achieving survey-grade accuracy. Here, we’ll cover GCP orientation troubleshooting to ensure optimal results.
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Selecting the Coordinate System
If your required coordinate system isn’t listed, opt for the “Local Coordinate System” option. Start by selecting any three Ground Control Points (GCPs) with a right mouse click. After the third point is chosen, you’ll see an estimated accuracy result in the lower right corner, helping guide your accuracy.
Automatic GCP Detection
When GCPs are automatically detected, they appear marked in green, indicating correct geometry detection. However, manual adjustments may be necessary for precise positioning. If green circles don’t appear around your GCPs, automatic detection was unsuccessful. In that case, click “Clear all marks” and choose another set of three GCPs to reinitiate detection.
Confirming and Adjusting GCP Marks
If automatic detection succeeds, click “Confirm Unknown Marks”. For any needed refinements, adjust the position of the green-marked target using a right mouse click, then click “Confirm Unknown Marks” to finalize the adjustment. If any GCPs were missed in field measurements, proceed with this method on additional points to improve positioning.
Checking and Improving GCP Positions
To review a GCP’s location in the imagery, hover over it to display the image name where the GCP is located. Return to those images as needed to refine each point’s position.
With these steps, your GCPs will be properly positioned, ensuring enhanced model accuracy and reliability.
For similar tutorials on GCP Orientation:
Ground control targets setup
Geo-reference your model in minutes: ground control point (GCP) orientation