The smallest measurable increment normal to the plane of measurement. A function of the resolution of measurement of interferometric phase.
The number of horizontal lines resolved in a picture is called the vertical resolution, and is determined by the television scanning method, be it NTSC, PAL, or some other format.
Also known as "vertical definition." The number of distinct horizontal lines, alternately black and white, that can be seen in a TV image. Vertical resolution is fixed by the number of horizontal lines used in scanning.