R2W PLUS
83
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 section 3.10 to change the value of K.
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