4.8.20. Overlap

Try these first

1. 1.

   What is meant by overlap in aerial photogrammetry?

   Hint

   Think of multiple images showing the same region.

2. 2.

   Define longitudinal overlap.

   Hint

   Consider the direction of flight.

3. 3.

   What is the minimum required longitudinal overlap for effective data collection?

   • 20%
   • 50%
   • 60%
   • 70%

   Hint

   Think of how many images overlap to prevent gaps.

4. 4.

   True or False: Lateral overlap occurs between successive photographs along the same flight line.

   • True
   • False

   Hint

   Consider the positioning of photographs.

5. 5.

   A survey requires creating a detailed topographic map of a hilly region. If the initial plan only allows for 40% longitudinal overlap, discuss the potential impacts and propose adjustments.

   Hint

   Think about the importance of full coverage.

6. 6.

   Calculate the number of required photographs for a flight line length of 2000 meters and a necessary airbase of 100 meters with the desired overlap percentage.

   Hint

   Consider how far each photo needs to cover.