Caution
As illustrated in Fig. 1, it is optimal to choose the known points P1 and P3.
The instrument should be set up in such a manner so that the angle between P1 and P3
becomes 90°.
The distances S1 and S2 should be similar.
The accuracy of a calculation result depends on the following:
1) The inner angle between known points is extremely small.
See P1 and P2 on above Fig. 1.
2) The inner angle between known points is extremely large.
See P4 and P6 on above Fig. 1.
3) The distance from a new point to a known point is extremely short or extremely long.
4) A new point (station point) and three or more known points are arranged on the same
circumference. See above Fig. 2.
When searching for a new point by free stationing and surveying by installing an instrument
in the point, accuracy may not be stabilized compared with the case where an instrument is
installed on a known point. In field work which needs a high-precision survey, we cannot
recommend this method.
92
P1
P3
New point
P4
P5
P6
P2P1
S1
S2
90 ﾟ
FIG 1 FIG 2
New point
P2
P3
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