Resection is used when setting up a Total Station on an unknown
point. The occupied point coordinates are calculated from two
or more angle and distance measurements to known reference
points. This command only applies to total stations.
The dialog above has options for EDM Mode and Robotics. These options will
only show up for supported total stations (ie. robots,
etc).
Configure Std Errors
can be used to set standard errors for the measurements, as shown
below. These settings allow you to take advantage of network
least squares and weighting in the resection calculation. The
default values are shown below:
Reference points are
distinct known points that are measured to calculate the unknown
occupied point. Direct and Reverse measurements are optional
by using the toggle Direct and
Reverse located in the Add
Reference Point section.
Reference points can be specified in several ways:
There are input boxes for the target (or rod) height, and instrument height. The Store Picked Points toggle controls whether or not the user is prompted to store screen picked points that are not found in the coordinate file.
After a reference point is chosen, it's description and
coordinate information are displayed. Press the Read button to initiate the
measurement for the currently displayed reference point.
After a successful measurement, the user will be prompted to verify
the measurement information. This gives the user a chance to
verify the target (or rod) height, and the option to discard the
data and take another measurement. The user will be prompted
to determine whether or not to zero the instrument on the first
reference point.
A minimum of two distinct
reference points and measurements are required to calculate the
occupied point. The calculated occupied point information is
displayed in the Resection
Results section. The input data is displayed in a list
structure and the user has the option to turn certain measurement
on or off using the On/Off
button or remove an unwanted measurement using the Remove button. The resection
results are calculated automatically anytime a reference point
measurement is added, a list item is removed, or a list item is
toggled on or off. A resection with three inputs 'on' and one
input 'off' is displayed below:
The Resection Results section shows the
calculated occupied point's northing, easting, and elevation and
the difference between the calculated coordinate and the individual
solutions as the residuals. The residual indicate the quality
of the data. High residuals suggest a problem with the input
data. When you press the OK button, you will be prompted to
verify the calculated occupied point. If accepted, the
calculated point will be stored to the coordinate file and you will
be setup on the calculated point backsighting the first point shot
in the resection.