- Topography: The mapping of elevation on land.
- Bathography: The mapping of elevation under water.
We use topographic maps in planning farm land or large buildings.
- Elevation: The height of a place relative to a reference height.
- Contour Lines: A line on a map joining points of equal height.
- Contour Interval: The difference in elevation between two adjacent contour lines.
- Depression Contour: Contour lines indicating a downward slope.