To fix some parameters based on apriori information.Many types of arrays could be used, the main are: Convenient management system allows to choose from several equivalent solutions one, which is on good agreement with other geological and geophysical information. There are options to use different inversion algorithms, as well as analysis of the results of inversion. ZondIP1D is based on concept of interpretation along the profile, therefore every site taken into account as part of interpretation with regards to section structure. The approach allows the program to reach quickly a solution which is consistent with additional information.ZondIP1D is designed for 1D inversion of resistivity and induced polarization (IP) data obtained by methods of vertical electrical sounding (VES or VES-IP). Therefore, a modification of the "Marquardt-Levenberg" inversion algorithm was developed which considers a probabilistic treatment of the field observations and the model parameters. To estimate apparent resistivity, double the spacing between C1 and P1, instead of simply the spacing between C1 and P1 as you would for the regular Wenner method: i.e., apparent resistivity is approximately equal to 4 a R, where a is the C1-P1 spacing and R is the apparent resistance. Experience has demonstrated that inclusion of a priori information of model parameters in this technique can result in convergence problems during the iterative procedure. The inversion of resistivity data is based on the "Marquardt-Levenberg" technique. Preference was given to accuracy over speed of calculation and therefore tests were performed on the various published filters to select the most adequate ones. For the computation of apparent resistivity model curves the linear filter theory was used. These procedures are all carried out on the screen. 1D Resistivity, IP, EM Software Interpex is a software company dedicated to the production of high quality affordable software for the processing, interpretation and display of geophysical data. Data smoothing includes single point correction, curvebranch shifting, and eccentricity correction (for Schlumberger arrays). Designed to process data obtained with Wenner, Schlumberger, and dipole-dipole arrays, the program is built around three main procedures: smoothing of noisy field data, accurate computation of apparent resistivity models and inversion of resistivity data in an iterative procedure which includes a priori information of the model parameters without generating convergence problems. The program RESIST has been designed to process sounding data according to these criteria of flexibility and userfriendliness. Computer programs to process and interpret resistivity sounding data are abundant these days, but only few of them are flexible, userfriendly, and commercially available.
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