Three-view hand-drawn sketches of landscape facilities

Quick answer：

Three-view sketches, also known as orthographic projections, are a common method in architecture and design for representing the form and dimensions of objects. In the context of landscape facilities, these sketches provide a clear and detailed view of the design from three different angles: front, top, and side. This helps in visualizing the structure and layout of the landscape elements such as walkways, garden beds, and structures.