EMIGMA Premium Series

EMIGMA for Airborne FEM + TEM

Airborne FEM + TEM software package is available as an add-on to other EMIGMA Premium packages or as a standalone product. The package includes the magnetics tools for ground or airborne data. The package also includes the ability to work with ground FEM or TEM data.

In the airborne FEM method, the transmitter and receiver coils are generally housed in a single case and are towed by a helicopter, whereas in airborne TEM transmitters are attached to the fixed wings, nose and tail of an aircraft and a 3-component receiver is housed in a bird. EMIGMA also provides configurations of helicopter TEM systems for both central loop and Slingram styles.

Airborne FEM and TEM offer the advantage of collecting large amounts of data over a relatively short period of time. Being not limited by the geophysical survey size, EMIGMA allows for rapid airborne FEM and TEM modeling within a full contrast range from massively conducting targets in a resistive environment to resistive targets inside a conducting earth, for any number of plate, prism and polyhedra anomalies. EMIGMA is an excellent tool for survey design as well as for interpreting your data.

Unlimited Survey Size!

Data Import

• Calibrated FEM data imports from ASCII files and some manufacturer's format
• Airborne TEM (GeoTEM/MegaTEM, HeliTEM, TEMPEST, VTEM and AeroTEM)

Data Processing and Correction

Data Display and Analyses

• Display of data over flight altitude variations, GPS positions
• Display of Apparent Resistivity as a surface or spatial contour
• PEXShow tool - 2D representation of geoelectric sections
• Display of 3D models sliced and diced in the 3D Visualizer
• Grids: Natural Neighbor, Delauney Triangulation, Shepard, Minimum Curvature and Thin-Plate-Splines
• Contours: 2D and 3D surfaces
• Time decay rate and amplitude contours (TEM)
• Line plots
• Residual plots
• Overburden model removal processing

For more detailed data display capabilities, see EMIGMA Complete

3D Modeling

• Fast and accurate 3D simulations: model suite generation and batch mode
• Prisms, thin-sheet plates, polyhedra and sphere targets
• Multiple body interactions
• Modeling of topography effects
• Modeling of magnetic effects in EM data
• Accounting for variations in resistivity, susceptibility and Cole-Cole parameters
• Ability to handle full contrast between host and bodies
• Incorporation of altitude information
• Interactive 3D model building tool

1D FEM Inversion

• Multi-Component and/or Multi-Frequency inversions, Inphase/Quadrature or Quadrature only
• Three algorithms to choose from
• Smooth Occam resistivity inversion with fixed layer thickness
• Smooth Occam joint susceptibility/resistivity inversion with fixed layer thickness with user defined starting models
• Underparametrized Marquardt Inversions - invert for thickness and/or resistivity
  • User defined starting models
  • User defined parameters for inversion
  • Full resistivity and thickness constraints
  • Spatial smoothing capabilities
• Suite of minimization techniques
• Incorporation of GPS_Z information

1D TEM Inversion

• 2 inversion techniques - Smooth Occam and an underparametrized Marquardt style
• 2 Forward techniques - one is approximate utilizing a causal transform and the other is accurate using accurate system response
• User defined starting model - multiple starting models allowed
• User defined inversion parameter and constraint definitions
• Multi-station, Multi-parameter inversions allowed
• Spatial inversion weighting
• Production orientated - inversions saved at regular intervals, inversion parameters saved to recoverable log files, inversion progress outputs, intermediate stops and restarts allowed

TEM Pseudo Inversion

• Display of time decays (layered or 3D) for user selected time windows

CDIMAP

• Apparent Resistivity Tool - a half-space mapping technique for generating apparent resistivities as a function of frequency
• Sengpiel Depth-Sections - a resistivity pseudosection technique for generating resistivities as a function of pseudo-depths
• CDI for TEM

Export

• Images exported to postscript files, raster or GeoTIFF formats
• Data export to XYZ ASCII (measured, modeled, inverted)
• Inversions exportable to ASCII file
• Grids to XYZ ASCII or Geosoft/Surfer formats
• Data export to Geosoft *.GBN format
• Data export to QCTool *.QCT format
• Models exported to EMIGMA or GeoTutor formats