Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Visual Works (hierarchy name)
5. visual works (works)
6. [visual works by form]
7. [visual works by form of image]
8. [images by method of representation]
9. [images by method of projection]
10. orthographic projections (images)
11. plans (orthographic projections)
12. area plans (orthographic projections)

Anotations

Scope note:

In the architecture of military fortifications, the term refers to ground plans of fortified works, including fortifications, mine fields, defensive positions, military installations, or other plans. The plans may be superimposed on a map or photograph.