Stonex R25/R25LR Total Station - User Manual 118
Appendix I: Atmospheric correction formula and chart
Factory setting: temperature: 20, pressure: 1013hPa, 0ppm
The correction:
＋
＋
Where:
p: Pressure value (hPa)
t: Temperature value ( )
Kpt: Atmospheric correction (ppm)
Example:
t=20, p=1013hpa, L0=1000m.
Then: Kpt=0ppm
Kpt=4ppm
L=L0(1+Kpt)=1000×(1+0×10-6)=1000.000m
L=L0(1+Kpt)=1000×(1+4×10-6)=1000.004m
The atmospheric value is obtained easily with the atmospheric correction chart. Find the measured temperature in
horizontal axis, and pressure in vertical axis on the chart.
Read the value from the diagonal line, which is the required atmospheric correction value.
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