Leica Nova MS60 User Manual page 84

Formulas
Reduction to mean
sea level D
2
Projection distor-
tion D
3
MS60/TS60, Technical Data
Formula for visible red laser
0.29535 · p
ΔD = 286.338 -
1
002419_002
D
Atmospheric correction [ppm]
1
p Air pressure [mbar]
t Air temperature [°C]
h Relative humidity [%]

1
273.15
x (7.5 * t/(237.3 + t)) + 0.7857
If the basic value of 60 % relative humidity as used by the EDM is retained, the
maximum possible error in the calculated atmospheric correction is 2 ppm, 2 mm/km.
The values for D
are always negative and are derived from the following formula:
2
H
ΔD 6
= -
· 10
2
R
TS_106
The magnitude of the projection distortion is in accordance with the projection system
used in a particular country, for which official tables are generally available. The
following formula is valid for cylindrical projections such as that of Gauss-Krüger:
2
X
ΔD 6
=
· 10
3
2
2R
TS_107
In countries where the scale factor is not unity, this formula cannot be directly applied.
-4
4.126 · 10 · h
x
-
· 10
D
Reduction to mean sea level [ppm]
2
H Height of EDM above sea level [m]
6
R 6.378 * 10 m
D
Projection distortion [ppm]
3
X Easting, distance from projection zero line with the
scale factor 1 [km]
6
R 6.378 * 10 m
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