Table of Contents
Advertisement
•
Position Indicator: The red vertical line corresponds to the location at the center of
the GPR sensor. As you pull the cart backwards, the Position Indicator moves to
mark the current location of the cart in the image and a box appears with the current
position, relative to the start of the line, listed as the top number.
Figure 6-5: a) Back-up Indicator, b) Moving the Depth Indicator to the top of the hyperbola
•
Depth Indicator: A short red horizontal line corresponds to the current depth value,
as shown in the bottom number in the box. To determine the depth of an object,
move the indicator up or down by dragging the horizontal line to the desired location
(Figure 6-5b). Alternatively, you can also use the Up and Down arrows on the 4-way
directional keypad. Note: make sure you have done a Soil Cal to ensure depth
accuracy
To locate a feature, simply roll the system back along the same path until the red vertical line is
exactly over the response (usually a hyperbola). You can mark the location of the object on the
surface and continue data collection. Once you reach the point where you initially started backing
up, the system will continue acquiring new data.
You can also obtain depth and position information anywhere on the Line Scan by touching the
screen and holding for a second. A cross-hair appears where you touched the screen, with a box
displaying the position and depth (Figure 6-6). To get the position and depth information about a
different point on the screen, simply touch and drag the box or cross-hair to the desired position.
(Section
6.6.5).
55
Line Scan
Advertisement
Table of Contents
