8.3. Geometry of Aerial Photographs

Try these first

1. 1.

   What type of photograph is taken with the camera directly looking down?

   Hint

   Think about how you would take a photo from a tall building.

2. 2.

   Why are vertical photographs preferable for mapping?

   Hint

   Consider how the angle of a picture can change its accuracy.

3. 3.

   What is the type of aerial photograph taken directly down?

   • Vertical
   • Oblique
   • Panoramic

   Hint

   Consider which angle would give the least distortion.

4. 4.

   True or False: Relief displacement has no effect on the measurements taken from aerial photographs.

   • True
   • False

   Hint

   Think about the concept of elevation differences.

5. 5.

   Create a photographic survey plan for a city using both vertical and oblique photographs. Explain your reasoning for choosing each type based on specific city features.

   Hint

   Think about how each photograph helps achieve different goals in urban planning.

6. 6.

   Discuss how one might correct for relief displacement when analyzing aerial photographs for topographic mapping.

   Hint

   Consider tools and software that help in making these adjustments.