Novapoint Landscape Library

Use this function to convert an arc into a series of straight-line elements with the same geometry as that of the arc.

• This tool sub-divides an arc/circle/polyline/clothoid into a series of straight-lines.

• There will be no change in the shape of the entity after sub-division.

• The length of the sub-divided straight-lines is determined by the radius, the clothoid parameter and by the accuracy required.

• The elevation of the converted straight-lines will be the same as that of the original arc, circle, polyline, clothoid, etc.

Command prompts for:

Select a circle/arc/polyline:

Select the arc/circle/polyline, which is to be modified as continuous polyline with only line elements. Program accepts only one entity.

Degree of accuracy <1.00>

Enter the accuracy number (a numeric value). Program converts the arc/circle/polyline to polyline, which will be having line elements only.

• 1.0 Very low accuracy.

• 2.0 Very high accuracy.

• 3.0 Half accuracy.

• 4.0 Double accuracy.

Degree of accuracy determines the accuracy to be used when sub-dividing arcs, transition curves, etc.

• The function suggests a default value of 1.00.

• If this value is increased, accuracy is increased and arcs are subdivided into more straight-lines.

• Smaller values give fewer lines. Large arcs require greater accuracy than small arcs.

• Degree of accuracy must therefore be evaluated from case to case.

• Any value from 0.1 to 3.0 can be used.

A circle in plan with a radius of 10.0 m is converted to straight lines:

• 0.1 Very low accuracy.
• 3.0 Very high accuracy.
• 0.5 Half accuracy.
• 2.0 Double accuracy.

If a circle in plan with a radius of 10.0m is converted to straight-lines.

Accuracy 1.0 Maximum deviation between radius and line segment: 3.1 mm, segment length 0.499m.

Accuracy 2.0 Maximum deviation between radius and line segment: 0.78 mm, segment length 0.249m.

Accuracy 0.5 Maximum deviation between radius and line segment: 12.4 mm, segment length 0.997m.

See the below illustration where deviation and segment length are graphically represented. The parameter 0,0031m is deviation and 0,4986m is segment length.