Topcon AP-L1A - Execution of Coordinate Measuring

6. COORDINATE MEASUREMENT
6-13
6.4 Execution of Coordinate Measuring
Operating the coordinate measuring by setting coordinate of the instrument point, the instrument
height and prism height enables the operator to obtain the coordinates of the measuring point.
 For the setting of coordinate of the instrument point and instrument height refer to "6.2
Setting Coordinate of Instrument Point"
 Setting for Prism height, refer to "6.3 Setting Target height (Prism height)".
 The coordinates of unknown point (N1,E1,Z1) can be calculated as following formula.
Coordinates of instrument point : (N0, E0, Z0)
Instrument height : INS.HT
Prism height : R.HT
The coordinates of prism center,originated from the
center point of the instrument : (n,e,z)
That is:
N1 = N0 + n
E1 = E0 + e
Z1 = Z0 + INS.HT + z  R.HT
Confirm the mode is set in angle measurement
Operating procedure Operating key Display
 Set instrument coordinate point and
instrument height. *1
 Collimate bearing point A.
V: 90

10' 20"
HR : 120

30' 40"
0SET HSET R/L 1

 Press [F2](HSET)key.
Set direction angle of backsight point A.
*2)
[F2]
H-SET
HR :
EXIT
  
CLR

Prism height R.HT
Z
1
z
Unknown point
(N
1
,E
1
,Z
1
)
Center point of
the instrument
Instrument
height
INS.HT
Instrument point (Z
0
,E
0
,Z
0
)
Origin (0,0,0)