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Description
Required elements
45.3.3
Graphical overview
Description
Roads - Road
a
Position to stake out, defined
by chainage, stake offset and,
optionally, stake height differ-
ence
b
Centreline/line that the posi-
tion is defined relative to
c
Offset
d
Height offset
e
Working chainage
f
CL offset
g
Difference in chainage
h
Difference in offset
i
Difference in height
When staking points, the points are defined by the stake chainage and, if
•
enabled, by the stake offset and the stake height difference relative to an
existing 2D or 3D centreline or line.
When checking points, the points are defined by the check offset and the
•
check height difference relative to an existing 2D or 3D centreline or line.
For 2D, a horizontal centreline is required.
•
For 3D, a 3D centreline is required.
•
Measuring Lines Relative to a Centreline
Stake road
c
d
a
f
e
g
i
h
c
Road_035
a
Position to stake out
b
Line to stake out
c
Centreline
d
Stake chainage
e
Chainage
f
CL offset
g
Difference in chainage
h
Difference in offset
i
Difference in height
Lines define various elements, including:
•
•
Centreline of the design
Change in slope ratio, for example, the edge of a carriage way
•
Gutter, cable, pipeline or any other type of alignment element
•
•
Refer to "43.6.3 Road - Basic Elements for Stake and Check Measure-
ments" for information on the usage of lines.
a
Position to check, defined by
check offset and, optionally,
check height difference
b
Centreline/line that the posi-
tion is defined relative to
c
Check offset
d
Check height diff
e
Working chainage
f
CL offset
g
Difference in offset
h
Difference in height
Check road
b
f
f
i
h
a=b
Road_066
a
Line to check
b
Projected point on line
c
Centreline
d
Chainage
e
CL offset
f
CL height diff
g
Difference in offset
h
Difference in height
a
c
e
h
d
g
b
e
f
c=d
a=b
761
h
g
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