What does the term 'level line' indicate in surveying practice?

The term 'level line' in surveying practices refers to a line that remains horizontal. This means that no matter the distances measured along the line, the elevation will not change. In surveying, maintaining a horizontal plane is crucial for establishing accurate elevations and for reference points in land surveying.

When a level line is established, it is used as a baseline from which other measurements can be taken; this precision is essential for tasks such as construction and land development, where accurate leveling is needed to ensure structures are built properly. Thus, the understanding that a level line is always horizontal is foundational to effective surveying techniques.