GeoMax Zoom 30 series - Page 243

Technical Data Zoom | 243
Height difference
VD Height difference [m]
YSD * sinζ
XSD * cosζ
ζ = Vertical circle reading
B (1 - k)/2R = 6.83 * 10-8 [m-1]
k = 0.13 (mean refraction coefficient)
R = 6.378 * 106 m (radius of the earth)
VD
= X + B · Y
2