Definitions of various surveying terms:
A series of measurements made to determine the borehole trajectory. A survey comprises position (North, East and True Vertical Depth) and/or direction (along-hole depth, inclination and azimuth) from which position is calculated.
Survey tool accuracy
The potential of a survey tool to determine the actual borehole position. The borehole position uncertainty is the potential difference between the measured borehole position and actual borehole position.
Survey tool quality
he potential of a survey tool to measure the actual borehole position is modelled by its . . .