Leica Geosystems TPS1100 Professional Series - Applikation - Feldhandbuch (Teil 1) - Manual (Page 62)

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This program is used to set out points along a reference line or
reference arc, with various offsets to the left and right. Radial
offsets can be applied to the arc and the reference line can be
shifted with parallel offsets or even rotated anytime to match
predefined setting out instructions.
The orthogonal setting out elements of the target points are
calculated in relation to the defined reference line/arc.
In Building and Construction, Reference Line is the specialized
program to set out building foundations (batter staking).
It may also be used for simple alignment types such as water and
sewer line layout as well as roadlines and bridges.
It is very convenient for orthogonal set out thanks to various offset
possibilities and because point coordinates do not need to be
precalculated. Only the coordinates of the start and end points of
the reference line/arc are needed.
Reference Line
Introduction