The smoothing filter can be adjusted to emphasize resistivity variations in the vertical, horizontal or diagonal directions. However, the inversion parameters can be modified by the user. The program will automatically choose the optimum inversion parameters for a data set. It supports the Wenner, Schlumberger, pole-pole, pole-dipole, dipole-dipole, multiple gradient and non-conventional arrays. On a modern PC, the inversion of a single pseudosection is usually completed within seconds to minutes. It is completely automatic and the user does not even have to supply a starting model. The RES2DINV圆4 programs use the smoothness-constrained Gauss-Newton least-squares inversion technique (Sasaki 1992) to produce a 2D model of the subsurface from the apparent resistivity data. Two-dimensional (2D) electrical imaging surveys are now widely used to map areas of moderately complex geology where 1D resistivity sounding surveys are inadequate. RES2DINV圆4 - 2D RESISTIVITY & IP INVERSION software.
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