ImpulseRadar PinPointR User Manual V1.5
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The system is then moved to the start point of the second profile (point 4).
It’s
essential to maintain
the distance in-between the profiles as decided during set-up. Press the forward button to start the
measurement when the push-cart is in position for the second profile. Upon reaching point 5, a
reference marker is again placed into the data. This time the left marker button is selected because
the next profile will be to the left of the present one.
After the last profile has been stopped, just return to the main menu on the standard Android way.
If data is correctly gathered, all profiles will be correctly aligned and orientated with the reference-
line and each other when opening the project in the CrossPoint software.
Dual View (DV)
This project type is intended to aid in on-site interpretation, rather than in post-processing. It is
particularly useful for identifying features/objects that are relatively linear across a survey area, e.g.,
foundation walls, tree roots or utility lines.
When collecting and viewing a single GPR profile, it is difficult to judge whether a reflector is a genuine
point of interest, or simply a reflection from debris or a random object. Consequently, it is useful to
view one or more parallel profiles to assist in their interpretation. This is the basis for the DV-project,
which allows the current profile being collected to be displayed alongside the previous one, thereby
making it easier to see if reflectors line up in similar positions across them. For this to work, the start
position of each profile must be aligned with the stop position of the previous profile, as shown below
in
Figure 29
Layout of Dual View-project
When the stop button is pressed at the end of a profile, the radargram is automatically reversed, so
that the next profile start point is aligned correctly. As the new profile is collected, it’s data can be
compared with the previous line. Furthermore, the back-up cursor (red line) covers both profiles
making it even easier to see how closely reflectors align, as shown in
It is possible to import a DV-project into Crosspoint. However, there should be equidistant spacing
between all profiles and profiles should be parallel as required for an RL-project. On import, the end
of profile 1 constitutes an artificial reference line. If considered before a survey, a DV-project may be
used for post-processing and interpretation just as an RL-project.
