Leica user manual Scale Correction, Correction ΔD1, Technical Data TPS1200 205

8.10Scale 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	The slope distance displayed is correct if the scale correction in ppm, mm/km, which
correction ΔD1	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

Technical Data TPS1200 205