how to prepare the file for import to res2dinv

The smoothing filter can be adjusted to emphasize resistivity variations in the vertical or horizontal directions. However, the parameters which affects the inversion process can be modified by the user. The program will automatically choose the optimum inversion parameters for a particular data set. Together with the free 2D forward modeling program RES2DMOD, it forms a complete 2D resistivity forward modeling and inversion package. Four different techniques for topographic modelling are available in this program. On a modern microcomputer, the inversion of a single pseudosection is usually completed within seconds to minutes. The use of available memory is optimised so as to reduce the computer time by minimising disk swapping. This program has been optimised for the inversion of large data sets. It is completely automatic and the user does not even have to supply a starting model. The RES2DINVx32/圆4 programs use the smoothness-constrained Gauss-Newton least-squares method inversion technique to produce a 2D model of the subsurface from the apparent resistivity data alone. The results from such surveys are usually plotted in the form of a pseudosection (Figure 1a) which gives an approximate but distorted picture of the subsurface geology. Two-dimensional (2D) electrical imaging surveys are now widely used to map areas of moderately complex geology where conventional 1D resistivity sounding and profiling techniques are inadequate.

(RES2DINV only license includes limited used of RES3DINV 3D inversion program) Seamless inversion of very long survey lines using sparse inversion techniques Supports up to 125000 data points on computers with 24GB RAM (RES2DINV圆4) Supports up to 16000 electrodes and 21000 data points on computers with 1GB RAM

Supports smooth and sharp constrasts inversions Supports exact and approximate least-squares optimisation methods Supports the Wenner (alpha,beta,gamma), Wenner-Schlumberger, pole-pole, pole-dipole, inline dipole-dipole, equatorial dipole-dipole, gradient and non-conventional arrays.

Supports on land, underwater and cross-borehole surveys RES3DINVx32/圆4 - 3D RESISTIVITY & IP INVERSION SOFTWARE RES2DINVx32/圆4 - 2D RESISTIVITY & IP INVERSION SOFTWARE

How to prepare the file for import to res2dinv