depth contouring

Depth contouring is a method used in mapping and navigation to represent changes in depth below the surface of water bodies, such as lakes, rivers, and oceans. It involves drawing lines, called contour lines, that connect points of equal depth. These lines help visualize the underwater landscape, making it easier to understand the shapes of the bottom terrain. For example, closely spaced lines indicate steep changes in depth, while widely spaced lines suggest gradual changes. This technique is essential for activities like fishing, boating, and underwater exploration, as it provides crucial information about the environment beneath the water's surface.