During orthorectification, why must the XY coordinates of fiducial marks be both inputted manually (from camera calibration) and identified on the image?

Question

Accepted Answer

To compute the coefficients of a 2D affine transformation that converts pixel coordinates into an image coordinate system.

Answer

To match image points with corresponding ground points.

Answer

To increase the ground sample distance (GSD) and improve spatial resolution.

Answer

To define an image space coordinate system with the focal length provided in the calibration certificate.

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During orthorectification, why must the XY coordinates of fiducial marks be both...

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