TcpMDT
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Proportional to Distance

If this method is chosen, the program calculates the total length of the traverse by adding up all the observation distances between the stations involved. In addition, it determines the closing error from the distance between the last station’s theoretical position and its actual position.
The adjustment consists of modifying the intermediate mobile station observations proportional to the run length with regard to total traverse length.
The general formula is:
where:
xi = Original coordinates of station i (the first is 0)
xi' = Corrected coordinates of station i
Ex = Overall traverse error in X
lj = Length of side j
L = Total length of the Traverse
 
The same formula is applied for Y and Z.