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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 shut: (0 VALUE)
Atmospheric Parameters (ppm):
Distance measurement is influenced directly by the atmospheric conditions
of the air in which distance measurement are taken.
In order to take into consideration these influences distance measurements
are corrected by using atmospheric correction parameters.
Temperature: Air temperature at instrument location.
Pressure: Air pressure at instrument location.
Atmos PPM: Calculated and indicated atmospheric PPM.
●The calculating formula for atmospheric correction is as follows:
(calculating unit：meter)
PPM = 273.8 - 0.2900 × Pressure Value (hPa)
1 + 0.00366 × Temperature value (℃)
If the pressure unit adopted is mmHg: make conversion with:
1hPa = 0.75mmHg.
●The standard atmospheric condition of STS Total Station instrument (e.g. the
atmospheric condition under which the atmospheric correction value of the
instrument is zero ) :
Pressure：1013 hPa
Temperature: 20℃
If regardless of atmospheric correction, please set PPM value as 0.
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