What's New

Version 2.00 - Upgrade to Windows 3.1 and 95.

Version 2.01 - Code optimizations for Windows 95/NT systems. Maximum grid size increased to 43-by-43 (1849) electrodes for systems with 128 MB RAM.

Version 2.03 - Support for non-uniform survey grids

Version 2.04 - Support for robust inversion.

Version 2.05 - Support for equatorial dipole-dipole (rectangular) array. Options to save the model resistivity and I.P. values in the Rockworks and Slicer/Dicer programs added.

Version 2.06 - Option to use 4 nodes between adjacent electrodes added. This gives greater accuracy, but at a huge increase in the computer time, for cases with large resistivity contrasts near the surface. The user can now stop the inversion process at the end of the current iteration by pressing the 'N' key. After displaying the model sections, the user can view the results from the later or earlier iterations by pressing the 'PgUp' or 'PgDn' key.

Version 2.07 - Options to carry out the inversion of IP data sequentially and to determine the I.P. damping factor automatically were added.

Version 2.10 - Incomplete Gauss-Newton inversion option added.

Version 2.11 - Data compression option for the incomplete Gauss-Newton method added. Maximum number of electrodes increased to 5041, and maximum number of data points to 67500, for systems with 1 GB RAM. The computer must have Win NT/2000/XP and a hard-disk using the NTFS file system format.

Version 2.12 - Option to use 3 nodes between adjacent electrodes added. Option to save model values in a binary format for the Slicer-Dicer program also added.

Version 2.13 - Support for 3-D underwater surveys added. Optimization made to inversion code for data from surveys with multi-channel instruments. For such surveys, the inversion subroutine is about 20-50% faster than version 2.11.

Version 2.14 - Support for borehole surveys and trapezoidal survey grids added.
Version 2.15 - Parallel computations on Pentium 3 and Pentium 4 computers. Optimizations made for surveys for surveys with the Wenner-Schlumberger array to further reduce the inversion time.

Version 2.16 - Batch mode inversion option added.

Version 2.20 - Multi-core CPU support added.

Version 2.21 - Cache optimization support added.

Version 3.00 - 64-bit version with support for up to 8 GB RAM.

Version 3.01 - Memory support increased to 16 GB RAM for RES3DINVx64.

Version 3.02 - Support for electrodes at arbitrary positions added and memory support increased to 128 GB for RES3DINVx64.

Version 2.22/3.03 - Support for diagonal roughness filters. Support for up to 12 CPU cores with RES3DINVx32, and 64 cores with RES3DINVx64.

Version 3.04 - Complex resistivity inversion option for IP data in RES3DINVx64. Option to include known boundary, and to set water layer resistivity for survey with floating electrodes in RES3DINVx64.

Version 2.23/3.05 - Support for topography data given as unstructured list added.

Version 3.05 - Options to reduce the calculation time for surveys with sparse electrodes arrangement, and for PCs with Intel CPUs in RES3DINVx64.

Ver. 3.06 - Support for long electrodes, and to reduce the Jacobian matrix calculation time for dense data sets in RES3DINVx64.

Ver. 3.07 - Option to calculate model resolution for models with up to 46,000 model cells in RES3DINVx64.

Ver. 3.08 - Option to rotate data set x and y axes to reduce model grid size required to model data with electrodes at arbitrary positions in RES3DINVx64. Option to convert data in trapezoidal grid format to arbitrary electrodes format added.

Version 3.09 - Support for tank boundaries, option to display trapezoidal grid and detection of degenerate trapeziums in RES3DINVx64.

Version 3.10 - Support for time-lapse data. RES3DINVx64 Basic and Professional versions. RES3DINVx64 Basic replaces RES3DINVx32.