A remote survey system uses a GNSS receiver, an on-board camera and a vision subsystem to provide real time three-dimensional (3D) global position information for a survey point that is in a location in which access to line-of-sight GNSS satellites signals is restricted. The camera takes images of the restricted access survey point location from unrestricted access locations and the GNSS receiver determines associated global positions. The vision system tracks an object of interest and at least three secondary objects at the restricted access survey point location in a plurality of the images and determines the positions of the objects relative to the camera and the orientations of the camera for the respective images. Using the relative positions, the camera orientations and the global positions of the camera, the vision subsystem calculates the global position of the restricted access survey point.
