Leica Geosystems TPS1100 Professional Series - Reference Manual - Manual (Page 189)

189
TPS1100 - Appl. Prog. Ref. Manual 2.2.0en Road+ File Editor
The general equation for a
parabola is:
Y = aX 2 + bX + c
When the parabola describes a
vertical curve in an alignment:
Y = The elevation above datum of
a point on the vertical curve;
X = The horizontal distance from
the beginning of the vertical
curve;
a = One half of the rate of change
of slope in the vertical curve;
b = The slope of the vertical
alignment, as a decimal
fraction (not percent), at the
beginning of the vertical curve,
and;
c = The elevation above datum at
the beginning of the vertical
curve.
Therefore, the "p" parameter may
also be expressed as:
p = ½a
Elevation
The Elevation or Z ordinate at the
beginning of the element.
Insert Parabola, continued Search
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"SEARC" on the previous dialog.
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to search.
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the input Station.
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Direction : Forward
Station : ----- m
SEARC
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