Civil Engineering Reference
In-Depth Information
taken the information is stored in the memory of the data collector. The data col-
lector will prompt the user to enter the name and description of the foresight—in
this case the name will be Point 2. We could also add a description of point 2, such
as
Old Stone Bound Found
or whatever description best fits the point. The data
collector will then store the horizontal angle, slope distance, vertical angle, point
number and description. In this case the horizontal angle would be AR98° 40′ 35″.
Notice that the horizontal angle was turned to the right, which is why the angle
is preceded by AR. The slope distance would be 141.42 feet. The point number
would be 2. If the angle were being measured to a traverse point or a point where
the best possible accuracy was desired, the angle would be turned multiple times
and the results averaged.
If this were a traverse, the total station would be moved to Point 2 and the back-
sight would be set on Point 1. A new point would be established ahead of Point
2 and the process would continue. Because tribrachs allow the equipment to be
interchanged on the same tripod this procedure is sometimes referred to as
Leap
Frogging
.
5.16 Example of Using a Total Station to Set
an Angle and Distance
Using a total station to set an angle and distance is a common procedure when
setting boundary corners. An example is shown in Fig.
5.15
. A traverse line,
established during the initial field work, exists between points 1 and 2. All calcula-
tions have been performed and it is now necessary to go back into the field to set
Fig. 5.15
Setting lot corners
