Sokkia im-101 Operator's Manual page 123

The automatic route search function cannot be used in the following case.
• The final measurement is to a traverse point on the traverse route other than the Start pt.

Adjustment methods
Adjustment is applied to results for traverse points and points observed from traverse points.
Adjustment methods and distribution options selected in step 8 are described below.
Method
Compass: The Compass method distributes the coordinate error in proportion to the length of the traverse
lines.
Northing adjustment =
Easting adjustment =
Where: L = length of the traverse line to the point
TL = sum of the traverse line lengths
Transit: The Transit method distributes the coordinate error in proportion to the northing and easting
ordinates of each traverse line.
Northing adjustment =|
Easting adjustment =
Where: ΔN = change in northing for the traverse line
ΔE = change in easting for the traverse line
Σ|ΔN| = sum of the absolute value of all the changes in northings of all the traverse lines
Σ|ΔE| = sum of the absolute value of all the changes in eastings of all the traverse lines
Angular adjustment
Weighted: Any angular closure is distributed among the angles of the traverse route based on the sum of
the inverses of the forward and back traverse line lengths at each angle. The backsight and foresight lines
are considered to have infinite lengths for the purposes of this weighting computation.
Linear: Any angular closure is distributed evenly among the angles of the traverse route.
None: No angular adjustment performed.
Elev adjustment
Weighted: Any closure in the elevations is distributed in proportion to the length of the traverse line leading
to the point (like the Compass method for coordinate adjustment).
Linear: Any closure in the elevations is distributed evenly in each leg of the traverse route.
None: No elevation adjustment performed.
L
------ - × closure north
TL
L
------ - × closure east
TL
ΔN
-------------- - ×
closure north
Σ ΔN
ΔE
-------------- ×
closure east
Σ ΔE
1

--------------- -

todist
∠
adjustment = ------------------------------------------------------- -
1

Σ
--------------- -

todist
117
1

+ -----------------------

fromdist
× ∠
closure
1

+ -----------------------

fromdist
24. TRAVERSE ADJUSTMENT