EarthImager 2D software
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EarthImager 2D is the new standard for
affordable resistivity imaging software.
With this software, DC resisitivity & IP (induced
polarization) data can be processed into easy to interpret 2D earth
The processed data can be output to various types of
files and can be processed into reports ready for submission to the
- Resistivity and IP inversion.
- ERT (electrical resistivity tomography) between two or more
boreholes and surface electrodes.
- Borehole IP data inversion.
- Time lapse resistivity inversion for monitoring applications both on
the surface and in the boreholes (upgrade).
- Survey planner with graphical model input, virtual survey with the
actual command file, and inverse simulation with user-specified Gaussian
- Topographic correction and printout of resistivity section with
- Finite difference and finite element forward modeling.
of boundary condition for forward modeling.
- Three inversion algorithms: damped least squares, smooth model, and
- Three IP data inversion methods: linear, nonlinear-concurrent, and
nonlinear-sequential inversion methods.
- Gauss-Newton and quasi Newton methods.
- User friendly Windows GUI.
- Fast graphics powered by OpenGL with automatic refresh and scalable
- Real time scrolling through all iterations using the mouse wheel,
creating "movie like" animation.
- Data editing for detecting and removing erroneous data points and
- Noisy data suppression.
- Both root mean squared (RMS) error and L2-norm statistics to monitor
the inversion progress and convergence.
- No software limit on number of data or number of electrodes.
- No limit on array type or electrode location.
- A graphical a-priori information input interface.
- Seamless operation with AGI resistivity instruments.
- Removable contour curves and automatic blanking.
- Windows true type font and true 24-bit color.
- Trackable and retrievable user settings.
- Tool buttons and popup menus for easy access to frequently used menu
- Inversion progress bar to show the inversion status.
- Well organized and hassle-free processing directory structure.
- Automatic file saving feature with on/off options.
- Retrievable inversion output/log file.
- High definition report quality plat style printout.
- Saving images as bitmap, JPEG or Windows metafile files at three
- Saving image data in XYZ format so it can be loaded into any
off-shelf graphics software.
- Check of computer memory status to estimate processing capability.
- Borehole command creator for AGI Sting/SuperSting instruments.
- Support of competitor's data file format.
- Data misfit scatter plot and cross-plot
- Convergence curve
- Reversal and horizontal shift of a profile.
- Batch inversion of many data files
2D Resistivity Inversion
Reads Sting data (and other instrument data formats) and produces a
default setting inversion, valid in most cases, after only a few clicks.
For advanced processing there are a number of settings for full user
control of the inversion process. Report ready high definition graphic
output in the form of engineering plate style drawing with title block.
2D Electrical Resistivity Tomography (ERT)
The software automatically detects bore hole data set for immediate ERT
processing. There is an editor for “bad” electrode and “bad” data removal.
From iteration to iteration the data misfit is displayed in a scatter
plot. There is also a data cross plot (raw versus inverted apparent
resistivity data) available as well as a diagram showing the convergence
Time Lapse Option
The optional Time Lapse function is used for any monitoring situation. It
could for example be used to detect leakage at a landfill site. In such a
case, the resistivity image is first recorded as "background" (before any
leakage). After the initial "background" setup, the survey is repeated at
regular intervals in the same way (electrodes in the same place using the
same array type, etc.) so that any change in the ground can be detected.
The time lapse function uses the inverted background section when
inverting the "new" section and the result is presented as the difference
between the two sections.
The time lapse method is used any time information about resistivity
changes in the ground is needed. Some common situations include potential
leakage from landfills, industrial sites, etc. Other monitoring situations
include fracture tracing by injection of a conductive solution such as a
salt solution. Other possible monitoring situations include saltwater
intrusion in coastal areas, remediation progress at environmental sites,
groundwater recharge, infiltration studies, to see how the ground is
"wetted" or how the ground dries up after a rain storm.
The survey planner is used for feasibility studies of resistivity imaging
projects. First load a command file, then enter the expected geological
features with their expected resistivities in a graphical input interface.
Then run the simulation using the actual command file and the software
will perform a virtual survey over the theoretical model. The result of
the virtual survey is then inverted and the result can be compared to the
original model within seconds.
In case of terrain relief it may be necessary to include topography
correction in the inversion process. Data with terrain elevation is read
from a “terrain file “ and the software will automatically perform an
inversion using a finite element model.