Leica FlexLine plus User Manual page 104

Vertical geometry
elements
FlexLine plus, Programs
Element Description
Spiral / A spiral is a transition curve whose radius changes along its length. A
Clothoid spiral has to be defined by:
• Start point (P1) and end point (P2) with known Easting and Northing
coordinates.
• Radius at the start of the spiral (R).
• Spiral parameter (
• Direction: Clockwise or Anticlockwise.
• Spiral type: Spiral in or Spiral out.
P2
TSOX_111
Spiral • Entry spiral (Spiral in = A): Spiral with a radius of infinity at the start
types and a given radius at the end.
• Exit spiral (Spiral out = B): Spiral with a given radius at the start and
radius of infinity at the end.
• Partial/Ovoid spiral: A spiral with a given radius at the start and
another given radius at the end.
B
TSOX_112
A
For onboard input Road 3D supports the following elements for vertical alignments.
Element Description
Straight A straight has to be defined by:
• Start chainage and start height of P1.
• End chainage and end height of P2, or length (L) and slope (%).
+%
L
P1
TSOX_113
Transition A circular curve has to be defined by:
curve
• Start chainage and start height of P1.
• End chainage and end height of P2.
• Radius (R).
• Type: Convex (crest) or Concave (sag).
a
P1
R
TSOX_051
) or length (L) of the spiral.
L · R
A =
R
P1 Start point
R
P2 End point
R Radius
L
P1
L Length
A Entry spiral
B Exit spiral
P2 P1
L
-%
P2
b
R R
P2
P1
R
P1 Start point
P2 End point
L Length
% Slope
a Convex
b Concave
P2
P1 Start point
P2 End point
R Radius
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