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11.4.2 Measuring Information
Measurement
sequences
The following measurement sequences are possible:
• Horizontal direction and vertical-angles only (resection)
• Distance and horizontal direction and vertical-angle
• Horizontal direction and vertical-angles to some point(s) and horizontal direction and vertical angles
plus distance to other point(s).
Single face I, single face II, or dual face I and II measurements are always possible. No specific point
sequence or specific face sequences are required.
Dual face measure-
ments
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.
Measurements not
included in computa-
tions
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
Description The measuring procedure automatically determines the method of evaluation, for example resection 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 measurements.
• The original averaged face I and face II measurements are used for the computation process.
• All measurements are treated with the same accuracy, whether these are measured in single 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 measure-
ments.
• The horizontal direction is computed with the original averaged face I and face II measurements and
the final computed plan position.
11.4.4 Resection Results
Access Press CALC. from the Sight target point screen after at least two points and a distance have been meas-
ured.
STATION COORDI-
NATES
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.
Next step
Press RESID to display the target residuals.
Target Residuals The TARGET RESIDUALS screen displays the computed residuals for the horizontal and vertical distances
and the horizontal direction. Residual = Calculated value - Measured value.
RESID
To display residuals. Refer to "Target Resid-
uals".
StdDev
To display the standard deviation of the coordi-
nates and angle.
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.
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