Specifications

University of Pretoria etd – Combrinck, M (2006)
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0 100 200 300 400 500 600 700 800
Depth [m]
Imaged Conductivity [S/m]
Smoothed dB/dt
Smoothed dB/dt and S
Smoothed dB/dt, S and dS/dd
Smoothed dB/dt, d(dB/dt)/dt, S and dS/dd
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0 100 200 300 400 500 600 700 800
Depth [m]
Imaged Conductivity [S/m]
Smoothed dB/dt
Smoothed dB/dt and S
Smoothed dB/dt, S and dS/dd
Figure 4-8: Effects of smoothing at different points in S-layer transform algorithm.
Figure 4-9 shows the output of the S-layer transform (imaged conductivity versus depth)
for twelve different combinations of differentiation method, smoothing and spacing of
data. (Smoothing of data here implies smoothing |V|, S and
σ .) Both smoothing and
resampling of data reduces the maxima of responses leading to an underestimation of the
conductivity contrast.
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