What do control data marks identify on maps?

What do control data marks identify on maps?

• A. Only latitude
• B. Only elevation
• C. Latitude, longitude, or all three
• D. Only longitude

Answer: (C)

Control data marks provide precise geographic coordinates that fix a point’s location on Earth. They give latitude and longitude to identify where a point sits on the surface, and they can also include elevation to place the point in three-dimensional space above a reference level such as mean sea level. Because some marks supply only two coordinates (lat and lon) while others include all three dimensions, the description that latitude, longitude, or all three best captures what these marks identify. In 2D mapping you rely on lat and lon; in 3D surveys you add elevation.