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RES2DINVx32 ver. 3.71 with multi-core support RES2DINVx64 ver. 4.03 with 64-bit

RES2DINVx32 ver. 3.71 with multi-core support RES2DINVx64 ver. 4.03 with 64-bit support for Windows XP/Vista/7/8 Installation and getting started users guide August 2014 Rapid 2-D Resistivity & I.P. inversion using the least-squares method Wenner (,,), inline dipole-dipole, pole-pole, pole-dipole, equatorial dipole-dipole, Wenner- Schlumberger, gradient and non-conventional arrays On land, aquatic and cross-borehole surveys www.geotomosoft.com ii Notice of Copyright RES2DINV is copyrighted by  Geotomo Software, 2000-2014. All rights reserved. No part of this document may be reproduced without written permission of Geotomo Software. Important Notice : We cannot provide free replacements for lost or stolen dongles that were in the possession of the end user. Please contact geotomo@gmail.com for the cost of a new dongle if it was lost or stolen. Dongles should be treated in the same way as any physical assets such as computers and insurance should be taken out in case it is lost or stolen. iii Table of Contents Topic Page No. 1 Introduction .................................................................................... 1 2 Computer system requirements ...................................................... 2 3 Copy protection .............................................................................. 3 4 Software installation ...................................................................... 4 5 Using the program – a quick start .................................................. 5 DISCLAIMER ........................................................................................ 9 SUPPORT ............................................................................................. 10 References ............................................................................................. 11 iv List of Figures Figure 1. Sequence of measurements to build up a pseudosection using a computer controlled multi-electrode survey setup. .............................. 1 Figure 2. Typical display output showing the measured and calculated apparent resistivitypseudosections, and the inversion model section. .... 8 1 1 Introduction This is a very brief guide to help you in installing and getting started with the program. The Res2dinvx32x64.pdf file has detailed instructions for using the software and should be used as the manual. RES2DINVx32 and RES2DINVx64 are computer programs that will automatically determine a two-dimensional (2-D) resistivity model for the subsurface for the data obtained from electrical imaging surveys (Dahlin 1996; Loke et al. 2013). It is a Windows based program that also supports multi-core CPUs. Figure 1 shows an example of the electrodes arrangement and measurement sequence that can be used for a 2-D electrical imaging survey. Many different multi-electrode systems have been developed over the past 25 years using different arrangements of the cables and measurement strategies (Loke 2014). The survey is usually carried out with a system where the electrodes are arranged along a line with a constant spacing between adjacent electrodes. However, the program can also handle data sets with a non-uniform electrode spacing. Figure 1. Sequence of measurements to build up a pseudosection using a computer controlled multi-electrode survey setup. 2 A finite-difference or finite-element modeling subroutine is used to calculate the apparent resistivity values, and a non-linear smoothness- constrained least-squares optimization technique is used to calculate the resistivity of the model blocks (deGroot-Hedlin and Constable 1990; Loke et al. 2003). If topography is present, the program uses a distorted finite-element grid so that the surface of the grid matches the topography (Loke 2000). If I.P. data is also present, the program will also generate an I.P. model together with the resistivity model using the complex resistivity method (Kenma et al. 2000). This program can be used for surveys using the Wenner, pole-pole, dipole-dipole, pole-dipole, Wenner-Schlumberger, multiple-gradient and equatorial dipole-dipole (rectangular) arrays. In addition to these common arrays, the program even supports non-conventional arrays with an almost unlimited number of possible electrode configurations (Loke 2014). You can process pseudosections with up to 16000 electrode positions and 100000 data points at a single time on a computer with 8 gigabytes (GB) of RAM using the Res2dinvx64 program. Besides normal surveys carried out with the electrodes on the ground surface, the program also supports aquatic and cross-borehole surveys. 2 Computer system requirements This program is designed to run on microcomputers using the Windows XP/Vista/7 operating systems. On a modern multi-core PC, it will take less than a half a minute to invert the data set obtained from a survey with 100 electrodes. RES2DINVx32 : The minimum amount of RAM required is 1 GB, while at least 2 GB is recommended. As this is a 32-bit program, it can only access up to 2 GB RAM. This is a limitation placed by Windows for 32-bit programs. RES2DINVx64 : A PC with a 64-bit multi-core CPU, at least 4 GB RAM and a 64-bit version of Windows is required. The program can access more than 4 GB GAM. This greatly increases the data and model size that can be processed. 3 As 32-bit PCs are becoming obsolete, the latest features might only be available in the RES2DINVx64 program. You will need a microcomputer with a multi-core Intel CPU to run this program. It is recommended that you use a PC with an Intel (rather than an AMD) CPU as the RES2DINVx64 program is optimized for this type of CPU. These optimizations can significantly reduce the calculation time for large data sets. The program uses the hard-disk to store temporary swap files. If you have more than one hard-disk drive, the program will automatically select the drive with the largest amount of free space as the drive to store the swap files. The amount of free hard-disk space should be at least 6 times the RAM. Practically all computers have an in-built power management system that slows down and eventually shuts down the computer system if the keyboard or mouse is not accessed after a certain time limit. This can interfere with the operation of the RES2DINV program if you are inverting a large data set or using the batch mode to invert a large number of data files. Windows also has an in-built screen saver functions that replaces the contents of the screen with a screen saver program. Before running the RES2DINV program, you will need to disable both the power management and screen saver programs. 3 Copy protection A USB hardware key (dongle) is supplied with the registered version of the program. You will need to install the driver for the dongle so that the program can detect it (please refer to the following section). The demonstration version of the program does not require a hardware key but some important features of the program cannot be used. Important Notice : We cannot provide free replacements for lost or stolen dongles that were in the possession of the end user. Please contact geotomo@gmail.com for the cost of a new dongle if it was lost or stolen. Dongles should be treated in the same way as any physical assets such as computers and insurance should be taken out in case it is lost or stolen. 4 4 Software installation If you had purchased the software with a CD, the following setup manager should be automatically displayed when you insert the CD. Click the appropriate item in order to install RES2DINV program; followed by the RES3DINV, RES2DMOD and RES3DMOD programs. To install the RES2DINVx64 program, scroll further down the list. Click the ‘Keylok USB Driver’ menu option to install the driver for the USB dongle provided with the full version of the program. Attach the dongle to the computer only after you have installed the driver. If you had downloaded the programs from the Internet, you will need to install the programs manually. The RES2DINV package comes in a single compressed installation file SETUP.EXE that is a Windows based installation program. The www.geotomosoft.com website also has the driver installation files for the dongle. 5 5 Using the program – a quick start Click the RES2DINVx32 or RES2DINVx64 icon to start the program. The program will first check the computer system to ensure that it has the necessary resources (such as memory and hard-disk space) that it requires. As an example, below is a typical initial information box displayed by the program. After checking the computer configuration, the program will then display the following Main Menu bar near the top of the screen. 6 You can select an option by clicking it with the mouse cursor. If this is the first time you are using the program, try reading in one of the smaller files such as the BLOCKDIP.DAT provided with the program. Click the "File" choice, followed by the “Read data file” menu choice. After that, if necessary, navigate to the folder where the RES2DINV program is installed. After reading in the file, go to the “Inversion” option, and then choose the “Carry out inversion” option. The inversion subroutine will start. Wait for about a second for the data to be inverted. If you need to stop the inversion routine at any time, just click the 'Next' sub-window at the bottom-right of the screen, and wait for a short while. By default, the program will carry out 6 iterations that can be increased if necessary. It is assumed that the input data is in the format used by this program. A detailed description of the data format is given in the Res2dinvx32x64.pdf file. Most multi-electrode resistivity equipment manufacturers supply a program to convert data from the native format used by the equipment to the format used by Res2dinv. 7 After uploads/s3/ res2dinv-guide.pdf