Sokkia B20, Operator'S Manual, Page: 43 / 60

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Therefore point B is 0.511m higher than point A. (The
value of h will be negative if point B is lower than point A.)
<When the distance between points A and B is large or if
the height difference is great>
1) Divide the distance into a number of sections and deter-
mine the height difference of each section.
Fig.6.2
2) The height difference between points A and B is the total
of the height differences of all the sections.
The general formula is:
Altitude of the required point = altitude of known point + total
of backsight values - total of foresight values.
※ This simple leveling technique has no error check. It is
better to measure from A to B and back to A so that the
error of closure can be calculated.