Demo/Upgrade software:

The latest updates to RES2DINV and RES3DINV require the Keylok dongle. Please note they no longer support the old Rainbow parallel port dongles which are more than 10 years old! Please contact geotomo@tm.net.my on the procedure to exchange the Rainbow dongle for the new Keylok USB dongle. To download the last version that support the Rainbow dongle, go to the 'Legacy Versions' table below.

64-bit 3D Resistivity & IP inversion software

This is the 64-bit version that overcomes the 2GB RAM limit of 32-bit Windows. It requires Windows XP-64, or Windows Server 2003 64-bit, or Vista 64-bit or Windows 7 64-bit. This version can use up to 128GB RAM. It took about 4.8 hours to carry out 5 iterations for the inversion of a data set from an area with significant topography with 147,355 data points, 9396 electrode positions and 64,400 model cells on a 3.2GHz Hex-Core Intel i7 computer with 24GB RAM and a 160GB SSD. Besides the ability of handle very large data sets that are beyond the capability of the 32-bit version, it is also significantly faster for large data sets due to the use of 64-bit CPU registers and faster algorithms that require more memory. Some options, such as electrodes at arbitrary positions, are only available in this 64-bit version.

This is a separate program from the 32-bit versions, and it is not a free upgrade. Please check the 'Ordering and Enquires' page for the cost of the program.

The RES2DINV and RES3DINV will operate in a 'demo' mode if the computer does not have the necessary dongle. The RES2DINV and RES3DINV demo programs are provided to enable potential customters to test the softwares before making a purchasing decision. In some cases, the free demo version has proved to be sufficient for the needs of the user. This is viewed as a demonstration of the usefulness of the softwares. However, technical support is only available for registered users of the full version of the softwares. If you want to purchase a copy of the full software version, please contact Geotomo Software or one of the authorised software distributors.

Legacy Versions

There are the last versions of RES2DINV and RES3DINV that support the Rainbow dongle.

The RES2DINV and RES3DINV will operate in a 'demo' mode if the computer does not have the necessary dongle. The RES2DINV and RES3DINV demo programs are provided to enable potential customters to test the softwares before making a purchasing decision. In some cases, the free demo version has proved to be sufficient for the needs of the user. This is viewed as a demonstration of the usefulness of the softwares. However, technical support is only available for registered users of the full version of the softwares. If you want to purchase a copy of the full software version, please contact Geotomo Software or one of the authorised software distributors.

Hardware key (dongle) software drivers

This software driver from Rainbow Technologies or Keylok is necessary for current registered users who are running the above programs with Windows XP/Vista/7.

The types of dongles used by the RES2DINV and RES3DINV software.  Only the Keylok USB dongle is currently sent with the software package.

Use of a dongle on a computer without a parallel port
Many new notebook computers do not have a parallel port but come with at least 2 USB ports. If you have one of the old parallel port dongles, the solution is to replace the parallel port dongle with a new USB dongle. Please contact geotomo@tm.net.my on the procedure to exchange the dongle.

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Free Software, Papers and Notes

Item	Description
Tutorial Notes - Dec. 2011 Update	Lecture notes on 2D & 3D electrical imaging surveys. (Revision date : 6th December 2010)
Notes	Notes on electrical imaging in SPANISH
Abstract	Some information about topographic modelling methods (PDF format)
Abstract	Abstract of paper on time lapse resistivity imaging in (PDF format)
Selected Journal Papers by M.H.Loke	(1). Loke, M.H. and Dahlin, T., 2002. A comparison of Gauss-Newton and quasi-Newton methods in resistivity imaging inversion. Journal of Applied Geophysics, 49, 149-162. (2). Dahlin, T., Bernstone, C. and Loke, M.H., 2002, A 3D resistivity investigation of a contaminated site at Lernacken in Sweden. Geophysics, 60, 1682-1690. (3). Marescot, L., Loke, M.H., Chapellier, D., Delaloye, R., Lambiel, C. and Reynard, E., 2003. Assessing reliability of 2D resistivity imaging in mountain permafrost studies using the depth of investigation index method. Near Surface Geophysics, 1, 57-68. (4). Loke, M.H., Acworth, I. and Dahlin, T., 2003. A comparison of smooth and blocky inversion methods in 2D electrical imaging surveys. Exploration Geophysics, 34, 182-187. (5). Chambers, J.E, Loke, M.H., Ogilvy, R.D. and Meldrum, P.I., 2003. Non-invasive monitoring of DNAPL migration through a saturated porous medium using electrical impedance tomography. Journal of Contaminant Hydrology, 68, 1-22. (6). White, R.M.S., Collins, S. and Loke, M.H., 2003. Resistivity and IP arrays, optimised for data collection and inversion. Exploration Geophysics, 34, 229-232. (7). Loke, M.H. and Lane, J.W., 2004. Inversion of data from electrical resistivity imaging surveys in water-covered areas. Exploration Geophysics, 35, 266-271. (8). Nguyen, F, Pirard, E., Garambois, S, Jongmans, D. and Loke, M.H., 2005. Image processing of 2D resistivity data for imaging faults. Journal of Applied Geophysics, 57, 260-277. (9). Loke, M.H., Chambers, J.E. and Ogilvy, R. D., 2006. Inversion of 2-D spectral induced polarization imaging data. Geophysical Prospecting, 54, 287-301. (10). Tonkov, N. and Loke, M.H., 2006. A resistivity survey of a burial mound in the Valley of the Thracian Kings'. Archaeological Prospection, 13, 129-136. (11). Linderholm, P., Marescot, L., Loke, M.H. and Renaud, P., 2008. Cell Culture Imaging Using Microimpedance Tomography. IEEE Transactions on Biomedical Engineering, 55, 138-146. (12). Sjödahl, P., Dahlin, T., Johansson, S. and Loke, M.H., 2008. Resistivity monitoring for leakage and internal erosion detection at Hällby embankment dam. Journal of Applied Geophysics, 65, 155-164. (13). Hilbich, C., Marescot, L., Hauck, C., Loke, M.H. and Mäusbacher, R., 2009. Applicability of ERT Monitoring to Coarse Blocky and Ice-rich Permafrost Landforms. Permafrost and Periglacial Process, 20, 269-284. (14). Rucker, D.F., Loke, M.H., Levitt, M.T. and Noonan, G.E., 2010. Electrical Resistivity Characterization of an Industrial Site using Long Electrodes. Geophysics, 75, WA95-WA104. (15). Loke, M.H., Wilkinson, P.B. and Chambers, J.C., 2010. Fast computation of optimized electrode arrays for 2D resistivity surveys. Computers & Geosciences, 36, 1414-1426. (16). Loke, M.H., Wilkinson, P.B. and Chambers, J.C., 2010. Parallel computation of optimized arrays for 2-D electrical imaging surveys. Geophysical Journal International, 183, 1202-1315. (17). Chambers, J.E., Wilkinson, P.B., Wealthall, G.P., Loke, M.H., Dearden, R., Wilson, R., Ogilvy, R.D., 2010. Hydrogeophysical Imaging of Deposit Heterogeneity and Groundwater Chemistry Changes during DNAPL Source Zone Bioremediation. Journal of Contaminant Hydrology, 118, 43-61. (18). Loke, M.H., 2011. Electrical resistivity surveys and data interpretation. in Gupta, H (ed.), Solid Earth Geophysics Encyclopaedia (2nd Edition) "Electrical & Electromagnetic",Springer-Verlag, 276-283. (19). Loke, M.H., Chambers, J.E. and Kuras, O., 2011. Instrumentation, electrical resistivity. in Gupta, H (ed.), Solid Earth Geophysics Encyclopaedia (2nd Edition) "Electrical & Electromagnetic", Springer-Verlag, 599-604. (20). Rucker, D.F., Fink, J.B. and Loke, M.H., 2011. Environmental Monitoring of Leaks using Time Lapsed Long Electrode Electrical Resistivity. Journal of Applied Geophysics, 74, 242-254. (21).Rucker, D.F., Crook, N., Glaser, D. and Loke, M.H., 2012. Pilot-scale field validation of the long electrode electrical resistivity tomography method. Geophysical Prospecting, in press, doi: 10.1111/j.1365-2478.2011.01039.x
Extended Abstract	The use of constraints in 2D and 3D resistivity modelling. Includes a survey example with floating electrodes.
Paper	Copper Hill mineral deposit 3D IP survey and inversion modelling by Arctan Services Pty., Australia
Extended Abstract	Loke, M.H., Fouzan A. Alfouzan and M. N. M. Nawawi, 2007. Optimisation of electrode arrays used in 2D resistivity imaging surveys. ASEG 2007 Extended Abstracts.
Publications	Web site with publications on electrical imaging in Spanish
Report	Report of geophysical survey in the Afar region (Ethiopia) by NGO Action Against Hunger. The search for groundwater in a harsh but beautiful land by electrical imaging.
RES2DMOD	Free 2D Resistivity and IP forward modelling software (Windows version 3.01.79) New array design function for surface, borehole and underwater surveys for registered RES2DINV users.
RES3DMOD	Free 3D Resistivity and IP forward modelling software, Windows ver. 2.14.21
RES1D	Simple and free 1D resistivity and IP program, ver. 1.00.08. This is a free non-commercial program released for academic use. It is not intended for commercial use (see the X2IPI program below for commercial work).
FreqEM	Free 1-D frequency domain EM modeling program for the EM-34 type of instrument.

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Links to other useful software

Item	Description
PDF Reader	Free Adobe Acrobat Reader program for PDF files
Text Editor	GWD Text Editor for Windows (shareware)
Graphics Editor	Neopaint graphics editing software (shareware)
Electrical Data Processing	Software to edit resistivity and IP data, includes 1D inversion
Shareware	Site for various demo and shareware programs
2D plotting	Demo for Surfer 2D plotting software
3D graphics and models	A sophisticated 3D earth science graphics package. Supported by RES3DINV.
2D and 3D graphics package	Includes functions to directly import model information from RES2DINV/RES3DINV
3D plotting	Demo for Slicer/Dicer 3D plotting software
ParaView	ParaView free opensource 3D visualization software

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