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Technical Data TPS1200 205
8.10 Scale Correction
Use 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 ΔD
1
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
• Relative humidity
For highest precision distance measurements, the atmospheric correction should be
determined with an accuracy of 1 ppm. The following parameters must be redeter-
mined:
• Air temperature to 1°C