Fig. 3. Scatter plots of apparent resistivity and soil moisture measurements with fitted relationship, for the moisture measurement depth yielding the greatest coefficient of determination for the given OhmMapper configuration of dipole cable and tow-link lengths. Nominal 1-m dipole cable length with (a) nominal 0.25-m tow-link length against 15-cm point measurements; (b) nominal 0.5-m tow-link length against 30-cm point measurements; (c) nominal 1-m tow-link length against 60-cm point measurements; and (d) nominal 2-m tow-link length against 70-cm point measurements.