What is the first thing that should be drawn on a terrain sketch?

The first element to be drawn on a terrain sketch is the skyline. The skyline provides a foundational reference for the overall shape and topography of the terrain being represented. It captures the visual contour of the terrain and sets the stage for integrating other features.

Establishing the skyline first aids in accurately visualizing and representing the relief and key elevations of the terrain. This step is crucial, as it allows the terrain sketch to maintain a proper perspective and relationship between various geographical features. Once the skyline is sketched, other elements such as landmarks, grid lines, and coordinates can be added with a clear understanding of how they relate to the overarching landscape.

In contrast, grid lines serve as a reference for orientation and measurement but would be less useful if the fundamental shape of the terrain is not established first. Landmarks are also important but are typically drawn in relation to the skyline and other features. Coordinates provide specific locations but depend on an understanding of the overall terrain layout that the skyline helps to establish. Therefore, starting with the skyline provides a coherent foundation for the entire terrain sketching process.