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Resix 2DI - 2D Resistivity and Induced Polarization Smooth Inversion


  • Support for Wenner, pole-dipole, dipole- dipole, pole-pole and Schlumberger arrays
  • Direct Support for instrument file formats including the Syscal series of receivers.
  • Support for expanding arrays by increasing a spacings
  • 256 Colour support for screen graphics
  • 256 Colour support for most common commercial hardcopy devices
  • User defined colour scale setup and contour settings
  • Topography corrections
  • Inversion Options
  • Invert both Resistivity and IP data
  • Show inversion progress in text or graphics mode
  • Control number of iterations by decrease in error value or absolute error value
  • Four methods of damping determination
  • Choose between Ridge Regression or Occam's inversion method
  • Control Partial Derivative calculations by using approximated or full solutions
  • Options to perform Quasi-Newton updates on all or selected iterations during inversion


RESIX 2DI is an interactive, graphically oriented, inversion program designed for the interpretation of resistivity and IP data. RESIX 2DI performs a 2-D cell based inversion, which is constrained by the resistivity pseudosection. The software supports Wenner, pole-dipole, pole-pole, dipole-dipole, and Schlumberger arrays. The only limits to the number of sources and receiver electrodes used are the speed of your computer and the size of its memory.

RESIX 2DI calculates the forward response of a homogeneous half-space using a finite element routine. It then performs a rapid least squares inversion of apparent resistivity using non-linear optimization techniques.

The regularization methods used to stabilize the inversions are of two types: the first is based on Occam's Principle, which optimizes smoothness in the model; the other is based on a ridge regression algorithm, which minimizes the least squares error.

There is also an exact inversion method available which calculates the partial derivatives of all the data and then performs the inversion. The resulting smooth model may then be saved in a binary random access disk file for later retrieval and presentation.

Topography corrections are done by calculating the resistivity response of a 1 ohm-meter homogenous earth containing the topography. These computed values may then be factored into the synthetic calculations (leaving the data untouched), or they may be divided directly into the field data.

The smooth model may in turn be used as a template for constructing polygonal starting models while in the RESIX IP2DI Resistivity and Induced Polarization Data Interpretation Software on page ???

Standard Components

RESIX 2DI v1 software and manual.