Definition of 2D Missing Line: a) a value between two remote points within the same plane that is calculated by measuring the slope distance and inclination to each targeted point.

The 2D result can be displayed in either percent slope or degree of inclination and equates to the slope distance, vertical distance, horizontal distance as well as the inclination value from the first measured target one to second one. Typically, this calculation is used to determine slope grades of hill sides or leaning tree heights.