When you need higher-than-normal elevations to complete your surveying, elevator tripods can accomplish the job without the need for pole extensions.
Aluminum, compound, or fiberglass extra-tall heavy-weight tripods are available for any task, and certain models can extend to almost 12-1/2 feet in height.
All feature leg-stabilizer struts, dual clamps, twist locks, and metal leg points for greater stability for instrumentation — even at full extension.