As a general rule on a closed and framed path, the altitude of the true reference point is different from the altitude of the calculated point, there is a closing difference that must be compensated for.
This spread is calculated by summing the back readings-the sum of the forward readings.
The closing gap can come from :
₪ One more false readings
₪ Poor horizontality of the device
₪ A malfunction of the device.
Not knowing the true origin of the closed gap, we established the following rule :
1. The closing deviation is small, i.e. thee deviation is less than the standard deviation, in this case the compensation is proportional to the number of elevation changes
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