Use of scale correction
By entering a scale correction, reductions proportional to distance can be taken into account.
• Atmospheric correction.
• Reduction to mean sea level.
• Projection distortion.
Atmospheric correction
The slope distance displayed is correct if the scale correction in ppm, mm/km, which has been entered corresponds to the atmospheric conditions prevailing at the time of the measurement.
The atmospheric correction includes:
• Adjustments for air pressure
• Air temperature
For highest precision distance measurements, the atmospheric correction should be determined with:
• An accuracy of 1 ppm
• Air temperature to 1 °C
• Air pressure to 3 mbar
Atmospheric corrections °C
Atmospheric corrections in ppm with temperature [°C], air pressure [mb] and height [m] at 60% relative humidity.
Atmospheric corrections °F
Atmospheric corrections in ppm with temperature [°F], air pressure [inch Hg] and height [ft] at 60% relative humidity.
