Resix 2DI
2D Resitivity and Induced Polarization Smooth Inversion
Features

Support for Wenner, poledipole, dipole dipole,
polepole and Schlumberger arrays

Direct Support for instrument file formats including
the Syscal series of receivers.

Support for expanding arrays by increasing a spacings

256 Color support for screen graphics

256 Color support for most common commercial hardcopy
devices

User defined color 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 QuasiNewton updates on all or
selected iterations during inversion
General
RESIX 2DI is an interactive, graphically oriented, inversion
program designed for the interpretation of resistivity and IP data. RESIX 2DI performs a
2D cell based inversion, which is constrained by the resistivity pseudosection. The
software supports Wenner, poledipole, polepole, dipoledipole, 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
halfspace using a finite element routine. It then performs a rapid least squares
inversion of apparent resistivity using nonlinear 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 ohmmeter 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.
