Structure and movement
Boom lifts use an arm arrangement to position a platform relative to the base. An articulating structure introduces joints along that arm path. Vertical position, horizontal offset and obstacles are distinct parts of the access problem and should be shown together on the site sketch.
Describe the base position, the target work point and the obstacles between them. Then describe how the equipment reaches the setup area. The platform path and the travel route answer different questions, so neither should be represented by a single height requirement.