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A sectional elevation is a drawing that looks like a slice through the earth. The site is seen side on, and allows you to think about how we can use gravity to maximum effect, in particular water and water, storages, flows of cold air (frost acts like a liquid that flows downhill), movement of warm air (rising), and movement of nutrients down slope (create nutrient traps.)
In addition a sectional elevation reminds us to design in 3D and make use of the permaculture principle of “stacking”. Use of trellis, climbers, and structures to allow stacking of plants can all make better use of space and increase productivity.