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38.11
Access
Horiz Curve Calcula-
tor,
Input page
COGO
Description of fields
P2
d2
P1
TS_131
COGO Calculation - Horizontal Curve Method
Select Horizontal curve from the COGO menu.
For all point fields, the 3D viewer can be used to select the desired point.
To type in coordinates for a known point open a selectable list. Press New to
create a point.
Key
Description
Calculate
To calculate the result.
Inverse
To calculate the values for a distance and an angle from two
existing points. Available when a distance field or an angle
field is highlighted.
Last Inv
To recall previous results from COGO inverse calculations.
Available when a distance field or an angle field is highligh-
ted.
Meas app
To measure a point manually for the COGO calculation. Avail-
able if Start point, Second point or End point is highligh-
ted.
Page
To change to another page on this panel.
Description of fields
Field
Option
Method
Selectable list
Parameter
1,
Parameter 2
Radius
Delta angle
DOC - Arc
Azimuth at-from
α
Azimuth at-to
ß
γ
Deflection angle
P0
Angle right
δ
d1
Angle left
ε
P0 Point ID
P1 At point
P2 To point
d1 Horiz distance at-from
d2 Horiz distance at-to
Description
The horizontal curve can either be defined by
three points or by two parameters.
Select which parameters are known. Available
for Method: 2 parameters.
Radius of the curve.
Angle in the radius point.
The degree of curve defines the sharpness or
flatness of the curve. Degree of curvature in
arc definition. The central angle subtended
by one station of circular arc. Used in high-
way design.
SI units: 1 station = 20 m
English system: 1 station = 100 ft
523
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