Spectra Precision Survey Pro CE v3.6 User Manual - Manual (Page 356)

Curve Menu
R-199
length from the TS to the current station.
Short crd. : is the chord length from the previous station to the
current station.
Traverse on Spiral
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The Traverse on Spiral screen is used to compute the location of, and
optionally store the SC, or ST and spiral PI points.
Radius : is the radius of the circular curve.
Length : is the length along the spiral curve
from TS to SC.
TS / CS Point : is the existing point associated
with the TS or CS point.
$]LPXWK / %HDULQJ : is the tangent direction
at the TS or CS point.
TS->SC : specifies that the curve starts at the
tangent to spiral and ends at the spiral to curve.
CS->ST : specifies that the curve starts at the curve to spiral and ends
at the spiral to tangent.
Right / Left : specifies is the curve turns toward the right or left as you
face the spiral from the TS or CS.
;
Store SC / ST : When checked, saves a point for the computed SC
point.
;
Store PI : When checked, saves a point for the computed spiral PI.
Results
Tangent In : the tangent direction entering the spiral at the TS or CS.
Tangent Out : the tangent direction exiting the spiral at the SC or ST.
X of Throw : is the distance along the tangent where a perpendicular
line intersects with the radius point.