IGNOU MGY 5 2026 - Importance of fiducial marks and principal points in aerial photograph

Question

Importance of fiducial marks and principal points in aerial photographs

19 Jan 2026

Answer :

Word Count : 225

Fiducial marks and principal points play a vital role in the accurate interpretation and geometric correction of aerial photographs used in remote sensing and digital image processing. Fiducial marks are fixed reference marks imprinted on the margins of an aerial photograph by the camera at the time of exposure. They define the internal coordinate system of the photograph and are essential for establishing the exact geometric center and

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