Thales Navigation gps receiver CGRS Manual

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160 Pages English

Thales Navigation gps receiver CGRS
34 Promark2 User’s Guide
Although the network design in Figure 3.4 was produced with conventional traversing in mind,
this same design can also be used if performing the survey with GPS equipment.
When designing your network, keep the following principles in mind:
• Design loops through the network points which resemble a square or circle. Avoid
loops that are long and skinny. Circular or square shaped loops are stronger
geometrically.
• Keep the number of points in each loop fewer than 10.
• Always include a direct link between intervisible points, i.e. points which may be
used as a pair for orientation of a conventional traverse. Since, in most instances,
intervisible points are relatively close to each other, it is important to get a direct
observation between them.
Observation Plan
With the network design completed, the next step is to determine how and when data collection
will be performed to produce the desired network. First let’s discuss the how.
If you were to use a conventional total station to perform the survey in Figure 3.2, your
resulting traverse could probably look something like Figure 3.5.
The number of traverse legs required to traverse between each point in the network will depend
upon the conditions on the ground between the points. If you are in luck, the area is relatively
flat and there is a straight road running from the existing control point to the two new points to
be established, thus minimizing the number of legs required to complete the loop.
Surveying with GPS has the advantage of not requiring line-of-sight between the points
surveyed. This allows for direct observations between the points. To illustrate this, let’s take
Figure 3.5 Closed-Loop Traverse of 3-Point Control Survey
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