(Analysis of Scanned Data Cont.)
An example scan, Figure 3.14, shows that the first scan point is the strongest difference.
This can be caused when first starting and not having the sensor in the correct position in
reference to the ground. It is important to be ready when clicking on the go button. A
helpful tip; have your hand on the mouse or spacebar ready to click and then line yourself
up with the first survey line. Try not to look at the screen when clicking. After clicking
and starting your grid, look at the screen to be sure that you successfully clicked on the go
button and that you are actually receiving data. Another possibility with a scan of this
caliber is that the sensors will actually “reverse polarity” based on the ferrous nature of
the element that the sensor has come in contact with. In that case the blue void would
signify a ferrous objectivity. The red is the common ground.
(Fig. 3.14)
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