Spectra Precision Survey Pro v4.5 Ranger Reference Manual User Manual

Page 394

Advertising
background image

Survey Pro Reference Manual

R-386

Chord Offset: provides perpendicular offset

information from the chord (the line from the PC

to the PT) for each station on the curve. PC
deflection information is also provided. The

results are given in the following format:

o

Station

: is the current station on the curve.

o

Chord dist.

: is the distance on the long chord

from the PC (toward the PT) where the

perpendicular offset occurs.

o

Chord offset

: is the distance to the current

station on the curve, perpendicular to the long
chord.

o

PC Deflection

: is the angle to turn to the

current station, as if occupying the PC and

backsighting the PI.

o

Chord Length

: is the distance from the PC to

the current station on the curve.

RP

PT

PI

PC

Current
Station

Chord

Offset

Chord Dist.

Chord Length

PC Deflection

Chord Offset

The first known part of the curve is defined by one of the following:

• Radius : is the distance from the radius point to the curve.

• Delta : is the deflection angle.

• Degree Arc : is the deflection angle that results in a 100-ft. arc

length.

• Degree Chord : is the deflection angle that results in a 100-ft.

chord length.

The second known part of the curve is defined by one of the following:

• Delta : is the deflection angle.

• Length : is the arc length.

• Chord : is the chord length.

• Tangent : is the distance from the PC or PT to the PI.

• Mid Ordinate : is the distance between the curve and the chord at

the center of the curve’s length.

Advertising