Introduction to Drawing Contour Lines

Understanding Topography and Control Points00:00:01

An explanation of how contour lines represent three-dimensional land topography on a two-dimensional map, utilizing survey control points with known elevations.

Locating Points for Contour Lines00:00:43

The process of identifying specific elevations by finding pairs of control points where the target elevation falls in between, using estimation to mark the correct spot on the map.

Drawing and Labeling Contours00:02:00

Steps for marking identified elevations with X's and connecting them with a smooth curve, including the rules that contours must be labeled and cannot end abruptly without reaching a map border or closing.