We have started to compute the traverse station

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We have started to compute the traverse
station coordinates from an anticlockwise polygon
traverse.
We tested the sum of the observed angles against
the sum of the internal angles of the polygon,
and if within an acceptable value we distributed
the misclosure.
We established the bearings of all the traverse
lines and then calculated the changes in Easting
and Northing for each line.
The algebraic sum of these changes should be
ZERO. The values give the error eE and the error
eN.
The linear misclosure e ? (eE2 eN2) was
calculated and used to find the FLM. If
acceptable then distribute the errors.
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a) Bowditch Method - proportional to line
distances
The eE and the eN have to be distributed
For any line IJ the adjustments are dE IJ and dN
IJ
dE IJ eE / SD x D IJ
Applied with the opposite sign to eE
dN IJ eN / SD x D IJ
Applied with the opposite sign to eN
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eE -0.094m SD 9172.59 m
dE IJ 0.094 / 9172.59 x D IJ
0.0000102479... x D IJ
0.0000102479x 638.57
dE AB 0.007m
0.0000102479x 1576.20
dE BC 0.016m
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0.007
0.016
0.039
0.032
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dN IJ eN / SD x D IJ
Applied with the opposite sign to eN
eN -0.654m
dN IJ 0.654 / 9172.59 x D IJ
0.000071299... x D IJ
dN AB 0.000071299 x D AB
0.000071299x 638.57
dN AB 0.046m
dN BC 0.112m
dN CD 0.273m
dN DA 0.223m
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CO-ORDINATE DIFFERENCES
S
T
CO-ORDINATES
A
CALCULATED
ADJUSTMENTS
ADJUSTED
T
I
O
N
N
D
D
d
d
D
D
E
E
N
E
N
E
N
A
638.616
0.007
4638.62
3000.01
0.007
0.046
5569.96
1728.32
931.339
-1271.685
0.016
0.112
1892.46
680.61
0.039
0.273
-3677.491
-1047.715
2107.536
2319.393
4000.00
3000.00
0.032
0.223
S 0
S 0
-0.094
-0.654
eE
eN