Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Information Forms (hierarchy name)
5. information forms (objects)
6. document genres
7. [documents by form]
8. graphic document genres
9. cartographic materials
10. maps (documents)
11. [maps by form]

Anotations

Scope note:

Maps displaying the distribution of a characteristic, such as precipitation, vegetation, or another feature, by using lines that connect points of equal value. They are distinct from "contour maps" in that they typically do not show the distribution of elevation of the landscape.