When establishing a PZ/LZ the first priority is to set up control facilities so there is reliable command, control, and security for the operation. With communications and leadership in place, you can coordinate air movement, convey clear instructions to aircrews, and protect the area from threats. Once control is established, you determine the length and width of the PZ/LZ to know the usable landing footprint and how much room is available for rotor wash, maneuvering, and approach. This sizing step sets the physical boundaries you must work within. Next you identify the area that is unusable, such as water, ravines, or ground that cannot support landing gear. Knowing what cannot be used prevents wasted attempts and helps focus your planning on viable terrain. After that, you assess obstacles inside the zone—trees, power lines, poles, debris—that could interfere with rotor blades or touchdown. This step informs clearance needs and potential detours. Finally, you mark and clear the touchdown points, or TDPs, so aircraft have precise, known landing points and a physically safe surface to touch down on. This completes the process by translating the map and risk assessment into actionable, safe landing sites.