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DC Resistivity  Forward and Inverse Modelling


RESIXPLUS has all the features of RESIX with the following additions.Sounding curves can be entered as apparent resistivity versus spacing; or, the voltage, current, and electrode spacings for both current and potential electrodes can be entered on the worksheet. The worksheet calculates apparent resistivities as you enter the data, using formulas that account for the finite electrode spacings.

Direct inversion allows you to estimate the layered model directly from the data curve, without having to manually construct the number of layers and layer resistivity and thickness. Extension of the input data curve for short and long electrode spacings, and curve resampling and transformation are done automatically and are transparent.

Smooth modeling enables you to automatically interpret resistivity sounding data in terms of a smooth model with up to 19 layers. The model depths are logarithmically spaced and are determined from a minimum and maximum depth. The depth range can be user-specified or automatically generated. Model resistivities are normally initialized to the average apparent resistivity. Inversion can be carried out in either interactive or batch mode, using ridge regression or William of Occam's smooth model concept. Results can be plotted, printed, listed on the screen or written to an ASCII file for use by user-supplied or third party software.

Equivalence analysis allows you to generate a set of equivalent models, (that is, alternative models that fit the data nearly as well as the best-fit model, but differ from this model). Equivalence analysis also indicates the allowable range of model parameters.

The MODEL SUITE command enables you to construct a collection of forward models by specifying one or more different values for a parameter. You can also generate new electrode spacings. This enables you to see the results of a specific change to the original model.

Standard Components

RESIXPlus software and manual.