We have very successfully incorporated the Clik Elite Bodylink backpack camera bag/mount, designed for standing telephoto pictures, into our terrestrial Ecosynth workflow.  The pack mounts to the front, and has an adjustable-angle clamp attached to an extendable bar with the correct gauge bolt for holding a camera.  It removes a lot of the physical stress and risk of dropping from protracted ground photo capture sessions, and potentially reduces camera blur.