Leica Captivate Technical Reference Manual page 637

Roads - General
Field Option
Perpendicu-
lar
Centreline Design
height ref-
erence
Interpolate
from rails
Lower rail
Always cal- Check box
culate
chainage
perpendicu-
lar to chain-
age centre-
line
Description
Use this setting when working with a rail bar
(solar gauge) with a fix mounted prism.
Easting, Northing and Elevation of the meas-
ured point is calculated using the design cant
or, if enabled, the manually defined cant.
a
b
Rail12_18
a Superelevation base
b Nominal gauge
c Measured point (Easting, Northing,
Height)
d Superelevation
The centreline height is taken from the align-
ment centreline.
The centreline height is interpolated between
the left rail height and right rail height.
The height of the lower rail is used as cen-
treline height.
Chainage calculation method when checking
points of multiple tracks with respect to a
chainage centreline.
The direct measurement method is when the
chainage is calculated by projecting the
measured point directly onto the chainage
centreline.
The indirect measurement method is when
the chainage is calculated by first projecting
the measured point onto the track centre-
line, and then projecting the point onto the
chainage centreline.
c
d
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