Question

Why is side lap provided in aerial photography?

• A. To prevent gaps between adjacent flight strips
• B. To improve camera focal length
• C. To reduce flying height
• D. To increase image resolution

Hint:

Typical overlaps in aerial photography: \[ \boxed{ \begin{aligned} \text{Forward overlap} &\approx 60\% \text{Side lap} &\approx 20\%-30\% \end{aligned} } \]

Answer 1

The Correct Option is A

Concept: In aerial photography, side lap is the overlap provided between adjacent flight strips to ensure complete ground coverage.

Step 1: Understand side lap. Side lap is generally about \[ \boxed{20\%-30\%} \] between adjacent strips. It helps to
• Avoid uncovered areas.
• Facilitate stereoscopic viewing.
• Improve photogrammetric accuracy.

Step 2: Identify the purpose. Hence, \[ \boxed{\text{Side lap is provided to prevent gaps between adjacent flight strips}.} \] Therefore, the correct option is \[ \boxed{(A).} \]