42
③
Click [Save] to save the value.
[Save]
※
1)The inputting scope of Atmospheric parameters
：
-100
～
+100 PPM(step length : 1PPM)
Atmospheric Correction value also can be set in star key (
★
)mode.
6.2.2 Atmospheric Refraction and Earth Curvature Correction
When calculating the horizontal distance and the height differences, the instrument
will automatically correct the effect of atmosphere refraction and the earth curvature
the correction.
The atmosphere refraction and the earth curvature are calculated by the formulas as
follows:
Corrected Horizontal Distance
：
D=S * [cosα+ sinα* S * cosα(K-2) / 2Re]
Corrected Height Differentia
：
H= S * [sinα + cosα* S * cosα(1-K) / 2Re]
If the correction of atmosphere refraction and the earth curvature are neglected, the
calculation formula of horizontal distance and the height differentia are
:
D=S·cosα
H=S·sinα
In formula:
K=0.14
……………………
Atmosphere Refraction Modulus
Re=6370 km
………………
The Earth Curvature Radius
α(or β)
………………...
The Vertical Angle Calculated From
Horizontal Plane (Vertical Angle)
S
………………………….
Oblique Distance
NOTE:
The atmosphere refraction modulus of this instrument has been set as: K=0.14.
it also can be set as :K=0.2,or be set shut (0 VALUE).(refer to “14”SYSTEM
SETTINGS).
