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 8 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. This version can use up to 32 GB RAM. It took about 5.6 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 2.67GHz Quad-Core Intel i7 computer with 12GB RAM. 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.

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 NT/2000/XP. The driver is usually not needed for Windows 95/98/Me, but if there are problems in detecting the dongle (possibly due to other software drivers that reconfigure the parallel printer port) then use the driver for Windows 95/98/Me.

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 and Notes

Item	Description
Tutorial Notes - Jan. 2010 Update	Lecture notes on 2D & 3D electrical imaging surveys. (Revision date : August 2009)
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)
Abstract	A couple of abstracts on SIP inversion
Paper	The use of constraints in 2D and 3D resistivity modelling. Includes a survey example with floating electrodes.
Paper	Paper on the Gauss-Newton and quasi-Newton inversion methods
Paper	A comparison of smooth and blocky inversion methods in 2-D electrical imaging surveys
Paper	Copper Hill mineral deposit 3D IP survey and inversion modelling by Arctan Services Pty., Australia
Paper	Dahlin et al. (2002). Case History : A 3-D resistivity investigation of a contaminated site at Lernacken, Sweden. Geophysics, 67, 1692-1700.
Paper	Marescot et al. (2003). Assessing reliability of 2D resistivity imaging in mountain permafrost studies using the depth of investigation index method. Near Surface Geophysics (EAGE), 1, 57-67.
Paper	Tonkov, N. and Loke, M.H., 2006. A resistivity survey of a burial mound in the 'Valley of the Tracian Kings'. Archaelogical Prospection. 13, 129.136.
Paper	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.
Paper	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.
Paper	Pontus Linderholm, Laurent Marescot, Meng Heng Loke, and Philippe Renaud, 2008. Cell Culture Imaging Using Microimpedance Tomography. IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 55, NO. 1, JANUARY 2008
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 3.01.61) 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. 1.00d. 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

geotomo@tm.net.my geoelectrical@yahoo.co.uk
115, Cangkat Minden Jalan 5, Minden Heights, 11700 Gelugor, Penang, Malaysia.