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14.8 Reduction Formulas
Formulas
The instrument calculates the slope distance, horizontal distance, and height
difference in accordance with the following formulas. Earth curvature (1/R)
and mean refraction coefficient (k = 0.13) are automatically taken into account
when calculating the horizontal distance and height difference. The calculated
horizontal distance relates to the station height and not to the reflector height.
aMean Sea Level
b Instrument
cReflector
SD Slope distance
HD Horizontal distance
VD Height difference
c
a
b
SD
VD
HD
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