Spectra Precision Survey Pro v3.80 Recon iPAQ Reference Manual - Manual (Page 187)

COGO Menu
R-181
HD/VD to SD/ZA
&RJR +'9' WR 6'=$
The HD/VD to SD/ZA screen will convert a vertical and horizontal
distance to an equivalent slope distance and zenith angle.
Horz Dist : is the horizontal distance from the occupy
point to the foresight point.
Vert Dist : is the vertical distance from the occupy point
to the foresight point.
HI : is the distance that the total station is above the
ground.
HR : is the length of the rod.
; Earth Curvature Adjust : When checked, the resulting
zenith angle and slope distance will account for the
curvature of the earth and refraction.
6ROYH : computes the equivalent slope distance and
zenith angle from the data entered.
Results
Zenith : is the computed zenith angle from the occupy point to the
foresight point.
Slope Dist : is the computed slope distance from the occupy point to
the foresight point.