Horizontal Shift; Vertical Shift - Leica Captivate Technical Reference Manual

Shift for surface
grade and road
crowns
Horizontal alignment
with constant hori-
zontal shift
684
Description
To allow widening and narrowing of surface grade and road crowns, only one
of the two lines defining the surface grade or crown, is shifted when adding a
horizontal shift. This behaviour is useful for small changes to the original
design, for example to bus stops or emergency bays.
a
b
c
Road_017

Horizontal shift

For surface grades and crowns, the horizontal shift is added to the line that is
defined as the reference line. To maintain the original surface grade/crown
ratio the line is shifted along the surface grade/crown.
c
a
b
Road_018

Vertical shift

The vertical component of the shift for a surface grade or crown is applied to
all lines.
c
a
d
e
Road_019
Horizontal shifts are always perpendicular to the centreline.
Rail_013
a
b
c
a
d
b
+
e
c
d
e
b
a
b
c
d
e
b
Plan view
c
a
b
a
d
c
d
Centreline
Original line of the design
Line with horizontal parabolic
shift
Surface grade to shift
Reference line of the surface
grade
Second line of the surface
grade
Positive horizontal shift
Position of the shifted refer-
ence line
Surface grade to shift
Right line of the surface grade
Left line of the surface grade
Negative vertical shift
Shifted surface grade
Reference line
Point to stake
Stake height difference
Stake offset
Roads - General