In perfectly vertical wells, the TVD equals the MD; otherwise, the TVD is less than the MD measured from the same datum. Common datums used are ground level (GL), drilling rig floor (DF), rotary table (RT), kelly bushing (KB) and mean sea level (MSL).
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what is horizantal and vertical prototyping
No, it is measured in positive numbers but it can be represented by negative numbers.
The opposite of a height is a depth. The opposite direction measurement of height (vertical) is width (horizontal).
Length times width times depth ( L x W x D ) measures cubic feet and must be measured in feet.
A line departs from the vertical when it deviates from a 90-degree angle. The amount of departure can be measured in degrees, with a line being perfectly vertical at 0 degrees and completely horizontal at 90 degrees. So, the more a line departs from the vertical, the further away it gets from standing straight up like a soldier.