In the plane table method, the three-point problem (resection) is solved graphically by:
Choose the correct answer
Setting up the plane table at a known point and drawing rays to unknown points
Determining the location of the plane table station from three known points visible from the unknown station (Bessel method or trial and error)
Measuring all three angles with a theodolite
Running a chain line to each known point
Correct Answer
B. Determining the location of the plane table station from three known points visible from the unknown station (Bessel method or trial and error)
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Resection (three-point problem): find position of instrument station P using three known points A, B, C visible from P. Methods: Tracing paper (rotation) method; Bessel method; Trial and error method (Lehmann). P must not lie on the circumscribed circle of triangle ABC (this is the dangerous circle where no unique solution exists).
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