Two examples of floors that must be made superflat are those in narrow-aisle high-rise storage facilities and those in television studios. Any small deviation in the flatness of the floor will be greatly magnified at the top of a fork-lift truck. As the truck moves over the floor its mast will tend to sway with the waves of the floor. In a television studio, as a camera moves across the floor there is a similar effect, causing the images to dance and shiver. Special floors with unusually small deviations from flatness are needed for both applications.
The specifier may want to study the exact floor profile along the path of travel. The exact profile can be obtained with special wheeled equipment that continuously makes measurements as the vehicle moves along the intended wheel tracks of the lift-truck or television camera. There are currently two pieces of equipment that can be used for such special evaluations. One of them is a self-propelled electronic device that senses the slope of the floor and measures contours in two different wheel tracks simultaneously. The other instrument measures three kinds of continuous floor profiles. The first is the sectional profile measured along the guided path relative to a horizontal plane. The second is the side-to-side difference in elevation between two parallel floor tracks. The third is the front-to-back difference between two points separated by a fixed distance along the guided path.