Chapter 11: Aerial Photography

Question 1

Vertical Photo

Answer 1

• camera/optical axis projected to the surface forms a 90 degree angle
• deviation must le less than 3 degrees or error is unacceptable
• used in photogrammetry and stereoanalysis

Question 2

Oblique Photo

Answer 2

• camera is intentionally tilted away from the vertical
• theoretical limits of tilt are 3 - 89 degrees

Question 3

Low Oblique

Answer 3

Horizon is not visible, shows only the surface

Question 4

High Oblique

Answer 4

surface, horizon, and sky are visible

Question 5

Photogrammetric Products

Answer 5

1. Topographic Maps
2. DEM: Digital Elevation Model
3. DOQ: Digital Ortho Quad
4. DLG: Digital Line Graph
5. Photo Mosaics