Product Manual

When measuring the same target in both faces, the reflector height may not be changed when
observing in the second face. Error checks are made for dual face measurements to ensure the
same point is sighted with the other face.
If a target point is measured several times in the same face, only the last valid measurement is
used for computation.
Target points with 0.000 height are discarded for height processing. If a target point has a valid
height of 0.000 m, use 0.001 m to include it for height processing.
11.4.3 Computation Procedure
The measuring procedure automatically determines the method of evaluation, for example resec-
tion or three point resection.
If more than the minimum required measurements are performed, the procedure uses a least
squares adjustment to determine the 3D position and averages orientation and height measure-
ments.
•
The original averaged face I and face II measurements are used for the computation proc-
ess.
•
All measurements are treated with the same accuracy, whether these are measured in sin-
gle or dual face.
•
Easting and Northing are determined by the least squares method, which includes standard
deviation and improvements for horizontal direction and horizontal distances.
•
The final height (Z) is computed from averaged height differences based on the original
measurements.
•
The horizontal direction is computed with the original averaged face I and face II measure-
ments and the final computed plan position.
11.4.4 Resection Results
Press COMPUTE from the STATION SETUP RESULT screen after at least two points and a dis-
tance have been measured.
This screen displays calculated station coordinates. The final computed results are Easting,
Northing and Height coordinates of the present instrument station, including the instrument
height.
Standard deviations and residuals for accuracy assessments are provided.
AddPt To return to the TARGET POINT
ENTRY screen to enter the next point.
Resid. To display residuals and to define the
use of points as 1D, 2D or 3D. Refer to
Target Residuals.
Std.Dev To display the standard deviation of the
station coordinates and orientation.
SET To set the station coordinates and/or
orientation.
☞
If the instrument height was set to 0.000 in the setup screen, then the station
height refers to the height of the tilting axis.
Field Description
Stn Current station ID.
Inst.H Current instrument height.
Dual face measurements
☞
Measurements not inclu-
ded in computations
Description
Access
STATION COORDINATES
Applications 67