Application of an improved S-layer differential transform on TDEM sounding data to delineate an iron ore deposit

The S-layer differential transform, based on the late time approximation of a thin conductive sheet, was applied to<br>Time Domain Electromagnetic (TDEM) sounding data acquired in order to delineate an iron ore prospect.<br>Although giving very good results on synthetic data, the S-layer differential transform is extremely sensitive to<br>noise in real data. This is due to the fact that the method requires two successive numerical differentiations which is<br>an extremely unstable procedure.