4.18. Exercises for Practices

Try these first

1. 1.

   What is aerial photogrammetry?

   Hint

   Think about photography techniques from above.

2. 2.

   Define relief displacement.

   Hint

   How does height affect appearance in photos?

3. 3.

   What does relief displacement depend on?

   • A) Height of object
   • B) Distance to object
   • C) Light conditions

   Hint

   Consider how height alters the photo appearance.

4. 4.

   True or False: The optical axis in a vertical photograph is perpendicular to the ground.

   • True
   • False

   Hint

   Think about how the camera is oriented for vertical shots.

5. 5.

   Calculate the scale of a vertical photograph if the flying height is 2500 m above ground, focal length is 80 mm, and the terrain is 300 m high.

   Hint

   Remember to convert all units to the same system.

6. 6.

   Analyze the difference in height between two points observed with a parallax of 6 mm and known heights of 100 m and 120 m, taken at flying height of 3000 m.

   Hint

   Which known factors can you use to derive unknown heights?