Use this dialog box to calculate curve parameters from input.
The following illustration shows the curve parameters used by Autodesk Civil 3D
- Degree Of Curvature Definition
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Specifies whether the degree of curvature will be based on the arc or the chord.
- Chord Definition: Specifies that the degree of curvature is determined by the chord. Use this option if the curve is a railway curve. For a railway curve, the degree of curvature is the angle at the center of a circular curve subtended by a chord of 100 units.
- Arc Definition: Specifies that the degree of curvature is determined by the arc. Use this option if the curve is a roadway curve. For a roadway curve, the degree of curve is the central angle subtended by a circular arc of 100 units.
The following illustration shows the degree of curve definition for arcs and chords.
- Fixed Property
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Specifies which property to hold as fixed while performing calculations.
- Radius: Specifies that the radius will be fixed.
- Delta Angle: Specifies that the delta angle will be fixed.
- Degree Of Curvature
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Specifies the degree of curvature.
- Delta Angle
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Specifies the delta angle of the curve. This option is not adjustible if Delta Angle is specified as the Fixed Property.
- Radius
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Specifies the radius of the curve. This option is not adjustible if Radius is specified as the Fixed Property.
- Tangent Distance
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Specifies the tangent length of the curve.
- Arc Distance
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Specifies the arc length of the curve.
- Chord Distance
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Specifies the chord length of the curve.
- External Distance
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Specifies the external secant length of the curve.
- Mid-ordinate Distance
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Specifies the mid-ordinate length of the curve.
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Sends the current value to the command line.
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Optionally selects an arc in the drawing and displays its values in the calculator. No edits you subsequently make in the calculator are updated in the drawing.