Supports data sets with up to 85,000 readings and 9,500 electrode positions on PCs with 8 GB RAM.Supports up to 130,000 readings and 11,000 electrode positions with 32GB RAM.Time-lapse resistivity data sets from monitoring surveys for up to 72 time-series on PCs with 32GB RAM.Inversion of IP data using the complex resistivity method.Support for data from surveys carried out on the ground surface, cross-boreholes, aquatic surveys with floating or bottom electrodes.Support for conventional arrays such as Wenner, Wenner-Schlumberger, dipole-dipole, pole-dipole, pole-pole, multiple-gradient and non-conventional arrays such as the offset pole-dipole array.The complex resistivity method (Kenma et al. Three different techniques for topographic modeling (Loke 2000) are available. Known boundaries where an abrupt change in the resistivity occurs can also be incorporated in the inversion model. Resistivity information from a borehole and other sources can also be included to constrain the inversion process. chemical plumes), or with sharp boundaries (for eg.
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It can also be optimized to produce models with smooth boundaries (for eg. 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. RES2DINV 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.
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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.