151
Technical Data
TPS400-5.0.1en
Reduction formulae
Height measurement
1) Mean sea level
2) Instrument
3) Reflector
The instrument calculates slope distance, horizontal
distance and height difference in accordance with
the following formula. Earth curvature and mean
refraction coefficient (k = 0.13) are taken into
account automatically. The calculated horizontal
distance relates to the station height, not to the
reflector height.
=
displayed slope distance [m]
D
0
=
uncorrected distance [m]
ppm =
scale correction [mm/km]
mm
=
prism constant [mm]
=
horizontal distance [m]
=
height difference [m]
= D
0
· (1 + ppm · 10
-6
) + mm
= Y - A * X * Y
= X + B * Y
2
