12.4 3-D COORDINATE MEASUREMENT
The instrument user may determine the coordinates of a target points based on the
station and backsight data along with rod and target heights.
The coordinate values of the target are calculated using the following formula.
N1=N0+S×sinZ×cosAz
E1=E0+S×sinZ×sinAz
Z1=Z0+S×cosZ+ih-th
N0：Station N coordinate S：Slope distance ih：Instrument height
E0：Station E coordinate Z：Zenith angle th：Target height
Z0：Station Z coordinate Az：Direction angle
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