Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. [image-making processes and techniques]
6. [photography and photographic processes and techniques]
7. photographic techniques
8. picture-taking techniques
9. [picture-taking techniques by location or context]
10. aerial photography

Anotations

Scope note:

The geometric correction of spatial distortions such as tilt and relief in aerial photographs, resulting in uniformity of scale. Orthocorrected images may be used to measure true distances; a basis of aerial photogrammetry.