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18. TOPOGRAPHY OBSERVATION
In topography observation, the instrument observes each target point once,
clockwise from the backsight direction and record the observed data. It is also
possible to conduct topography RL observation which observes the target point
once from each of the "Right" and the "Left" of the scope.
Topography observation
Order of observation
(1) R1
(2) R2
(3) BR3
Topography RL observation
Order of observation
(1) R1
(2) L1
(3) R2
(4) L2
(5) R3
(6) L3
Target point
T1 (backsight direction)
Target point
T1 (backsight direction)
Instrument
station
S
Instrument
station
S
T2
T3
(1)R1
(2)R2
(3)R3
(1)R1
(2)L1
(3)L2
(4)R2
(5)R3
(4)L3
T2
T3
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