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13. SETTING INSTRUMENT STATION
Resection calculation process
The NE coordinates are found using angle and distance observation
equations, and the instrument station coordinates are found using the
method of least squares. The Z coordinate is found by treating the average
value as the instrument station coordinates.
Precaution when performing resection
In some cases it is impossible to calculate the coordinates of an unknown
point (instrument station) if the unknown point and three or more known
points are arranged on the edge of a single circle.
An arrangement such as that shown below is desirable.
Calculated instrument
station coordinates set
as hypothetical coordinates
: Unknown point
: Known point
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