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Appendix Ⅱ：Correction for refraction and earth
curvature
Considering the correction of refraction and earth curvature for distance
measurement, the formula for slope distance, horizontal distance and vertical
distance applied in the instrument are as followings:
The conversion formula for horizontal and vertical distance is as follows when
correction for refraction and earth curvature is not applied:
HD=SD COS§ VD=SD ∣SIN§∣
NOTE:
◆ The factory setting for the refraction coefficient K is 0.142.
Refer to the “§3.8.1 Measure Condition Setting” to change the value.
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