A more thorough explanation:

Definition: A surveyor is a person who measures and maps land, buildings, and other physical features.

Example: John is a surveyor who works for a construction company. He measures the land and creates a map of the area before the company starts building.

Explanation: The example illustrates how a surveyor measures and maps land before construction begins. Surveyors use specialized tools and techniques to accurately measure and map the land, which helps ensure that buildings are constructed in the right location and to the correct specifications.