DCIP2D:
Synthetic Example 3 - Coarse-mesh Inversion

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The automatic mesh generator built into the inversion programs allows the user to control the mesh by defining the number of cells per station interval (ncell) and the aspect ratio of cells near the surface (aspr). The default mesh is generated using (ncell,apsr)=(2,2). In this and the following examples, we illustrate the effect of the finite difference mesh on the inversion results. We first invert the data using a coarse mesh by setting (ncell,apsr)=(1,2). The remaining parameters are the same as those used in Ex 1. The recovered resistivity fits the observations to the expected misfit value, but the chargeability model misfits the data at a slightly higher value. Both models appear rougher than those in Figure Ex 1. Standard Inversions. It is apparent that the deterioration in the quality of the recovered models is mainly due to the error resulting from the poor discretization of the surface topography.