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For either scenario above, once the red hyperbola is properly positioned, you can now
use the + and – buttons on the Soil Cal button to widen or tighten the shape. Once the
shape is matched (Figure 6-13 and bottom image of Figure 6-15), you now have the
correct Soil Cal and the measured depths will be most accurate. Press Apply to use
this value.
If you get a Soil Cal near 300, this could be an Air Wave
calibrate to a different hyperbolic response.
6.6.6 Interp
Short for field interpretation, Interps are used to mark subsurface features. Seven colours are
available, which allow you to designate different types of subsurface objects.
Either during collection, back-up or review, you can simply touch anywhere on the screen to add
an Interpretation (Figure 6-16). This appears as a dot of whatever colour is selected. To
change the color, press the Interp button to see a selection of colours and to select a new one
(Figure 6-17).
To remove an Interp, ensure the same color is currently active and simply touch the Interp to
delete it.
These field interpretations get exported with the data as a .CSV file, which show the positional
information of all interps. They can be used to check if a feature is linear (in Map View or in
TM
Google Earth
), but only if the more accurate external GPS is used.
Figure 6-15: Adjusting Soil Cal, without backing up
63
(Section
5.5), and you should
Line Scan
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