Objectives:

1. Differentiate among vertical, high oblique, low oblique, and horizontal photographs and state the advantages of one over the other.
2. Determine the relationship between the focal length, the angle of coverage and the ground area photographed and understand the use of a specific focal length under specific circumstances.
3. Be able to identify the fiducial marks on an aerial photograph, draw the coordinate axes and locate the three photo centers on a tilted vertical aerial photograph in areas where tall objects are present and clearly visible.
4. List the different types of photo distortion or displacement and define the difference between these two effects, state their causes, and provide solutions for their corrections.
5. List the types of distortion or displacement that radiates from the three photo centers and know how to correct for or avoid them.
6. Describe the relief, tilt, and their combined effects on the object image displacement and state inferences that can be made from the relief displacement equation for topography and solve problems based on these inferences.
7. List the factors that influence relief displacement on a single aerial vertical photograph.
8. Determine object image displacement and object heights due to relief based on the relief displacement equations.
9. Understand the geometry of the different types of aerial photographs and be able to determine ground distances, orientations, coordinates, and other related parameters from single aerial photographs (untilted, tilted, or oblique).

Title Page  |  Objectives  | 6.1  Classification of Photographs