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Correction Statement
Earth Curvature: E = X 2 / (2R)
X = measured distance, R = 6378000m(Diameter of earth)
Refractive index: K = rk* (X*X)/(2R)
rk= refractive constant, X= measured distance.
I Angle = arctan[(A1-B1+B2-A2) / (d1-d2+d3-d4)]
A1, B1, B2, A2 = height of staff
d1, d2, d3, d4 = the distance which relative to the height of staff
Total Stadia difference = ∑ BS Stadia - ∑ FS Stadia
Total Stadia = ∑ BS ∑ FS Stadia
Station Distance = BS FS Stadia
Station Height Difference = (back staff record 1 + back staff record 2 - fore staff record 1 -
fore staff record 2)/2
Total Height Difference = ∑station height difference
Height Difference = (back staff record 1- fore staff record 1)- (back staff record 2- fore staff
record 2)
Observation Difference in two times measurement: back staff record 1- back staff record 2;
fore staff record 1 - fore staff record 2.