Leica TPS1200+ Series, User Manual

Page: 192 / 214

192 Technical Data
7.10 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
Δ D
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