Spectra Precision Survey Pro v3.80 Recon iPAQ Reference Manual - Manual (Page 192)

Survey Pro Reference Manual
R-186
Known PI and Tangents
&XUYH 3, DQG 7DQJHQWV
The PI and Tangents screen is used to compute and store the PC, PT,
and radius points when the PI point and the direction of both
tangents are known, along with one other curve attribute.
PI Point : is the PI point.
$]P 3,!3& / %UJ 3,!3& : is the direction of the
tangent from the PI to the PC.
$]P 3,!37 / %UJ 3,!37 : is the direction of the
tangent from the PI to the PT.
The remaining curve attribute can be defined with one of
the following selections:
• 5DGLXV : is the distance from the radius point to the
curve.
• 'HOWD : is the deflection angle.
• 'HJUHH $UF : is the deflection angle that results in a
100-ft. arc length.
• 'HJUHH &KRUG : is the deflection angle that results in
a 100-ft. chord length.
;
Store PC : When checked, will store the computed PC point with
the specified point name.
;
Store RP : When checked, will store the computed radius point with
the specified point name.
; Store PT : When checked, will store the computed PT point with the
specified point name.