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43.2.3
Design data for Road
Roads - General
Design Data
2D and 3D lines
Depending on the method to be used, the design in all road jobs must consist
of either 2D or 3D lines.
2D lines are required at least when working with lines, local lines, manual
slope, local manual slope or layer. If the design consists of 2D lines, heights
can be considered manually.
3D lines are required when working with slope, surface grade or crown. 3D
lines can also be used when working with lines, local lines, manual slope, local
manual slope or layer.
Description
Depending on the complexity of the road job, the design data can vary from a
single horizontal alignment to a design containing profiles with dozens of
defined vertices. Design elements can be grouped logically for faster access.
Lines
When manually typing in a road job, alignments and cross sections are used.
Alignments are defined by geometric elements, for example straights and arcs,
and the cross sections by vertices. Furthermore, at which chainage a certain
cross section is used is also defined. By defining these elements the vertices
are connected to create a series of lines representing the three-dimensional
design of the road.
Road_029
Such lines defining the design are called lines. Lines are the base elements
used for stakeout and check activities. Lines have a project unique name by
which they are identified and selected. Whenever a new road design is typed
in or imported from a design package these lines are generated automatically
in the background.
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A cross section can be derived from the line model by slicing the
group of lines with a vertical plane orthogonal to the centreline.
Road_030
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Lines are referenced by layers and can be used in more than one
layer.
Line representation of a road
design.
Vertical cut of a line group
defines a cross section.
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