3-D Coordinate Measurement - Sokkia 130R Series Operator's Manual

12.3

3-D Coordinate Measurement

The coordinate values of the target can be found by measuring the target based
on the settings of the instrument station and backsight station.
The coordinate values of the target are calculated using the following formulae.
N1 Coordinate = N0 + S x sinZ x cosAz
E1 Coordinate = E0 + S x sinZ x sinAz
Z1 Coordinate = Z0 + S x cosZ + ih - fh
N0: Station point N coordinate S: Slope distance
E0: Station point E coordinate
Z0: Station point Z coordinate
Z (zenith angle) is calculated as 360° -Z when the telescope is in the face left
position if either the horizontal angle has been set to 0 by pressing [0SET] or the
required horizontal angle has been set by pressing [H.ANG].
• If not measured or the space is left blank "Null" will be displayed.
If station point Z coordinate is set to "Null" the observation result for the Z
coordinate is automatically set to "Null".
PROCEDURE
1. Sight the target at the target point.
12. COORDINATE MEASUREMENT
Z: Zenith angle
Az: Direction angle
ih: Instrument height
fh: Target height
47