Answer :
When estimating the test pattern for geometric distortion, all lines should seem straight.
What is geometric distortion?
Geometric distortion, when seen in a suitably scaled common picture display plane, describes the incorrect positioning of scatters with regard to their true position in the output image.
Terrain, camera tilts, film deformation, camera lens, atmospheric bending, and other camera flaws are the six main causes of aerial image distortion. The two main sources of air that tilt the camera are thought to produce the most error: the terrain and the camera itself.
The difference between the coordinate data from the actual image acquisition (sensor) and the ideal image coordinate data is known as geometrical distortion. Geometric correction entails gathering ground control points on the image and adjusting for geometric distortion brought on by some variance.
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