ModelVision is a new and innovative geophysical package for visualizing and modelling 3D gravity and magnetics data. Encom has designed this system for the interpreter and runs on PC's and Unix workstations. Visualize your models in the context of your data with cross-section, map and image presentations.

• Powerful Modelling
• Model Types
• In-line Filters
• Inversion Modelling
• Option for automatic depth to magnetic basement
• Regional-residual Separation
• High Performance
• Data Display
• Drawing and Interpretation Overlay
• Line & Grid Filtering
• User Interface
• ER Mapper Interface
• Flexible Data Sources
• Utilities
• Supported Platforms

Real time 3D modelling of simple or complex geological models focuses on the needs of the interactive interpreter. With a wide range of body types, ModelVision is suited to mineral, petroleum, engineering and environmental geophysical studies. You can model complex cross-sections from seismic surveys, build regional geological models or just evaluate a single anomaly. With its ability to model data from multiple traverses, images, drill holes and distributed points, ModelVision is the most flexible modelling system on the market. Model magnetic and gravity data independently or simultaneously.

Modelling of large data sets can be achieved in real time by activating subsets of the data. Move your active view across the survey as your geological focus changes. This feature makes modelling of large data sets practical on PC's as well as Unix workstations.

In-line filters allow you to perform your modelling through the eyes of a specialized filter. Use the 1st vertical derivative to remove unwanted regionals or an upward continuation filter to see through near surface noise.

Display the individual responses of bodies so that you can evaluate their relative contributions to the total field anomaly..

Interactively build a smooth 2D regional field across the project that can be used in every model line or image

Use inversion to tidy up your interpretation or to derive specific body parameters in a geologically constrained environment. Inversion can cut your interpretation time by over 50%. Typically an interpreter achieves a practical geological model in 10 - 20% of the modelling time and then spends the remaining time trying to improve the "goodness of fit". Use inversion to improve the quality of your results and access the full dynamic range of your field data.

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ModelVision supports a comprehensive range of solid model body types that can be composited to build simple or complex simulations of real geological environments. All body types support remanence calculations and demagnetization can be calculated for the sphere, ellipsoid and elliptic cylinder. View some examples:

• 3D plunging polygon incorporates the following standard body types: 2D polygon for conventional cross-section modelling.
  2.5D polygon for cross-section modelling incorporating objects of finite strike length.
  3D polygon for cross-section modelling with arbitrary line orientation.
  3D polygon with plunge for cross-section modelling with arbitrary line orientation and body plunge away from the section.
  
• 3D plunging prism for modelling complex shapes in map view.
• Tabular body for simple model constraints such as dykes and dipping volcanics.
• Sphere for point bodies that need to include demagnetization.
• Ellipsoid for ore bodies with high magnetization and arbitrary orientations.
• Elliptic cylinder for cavern related problems.

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• Graphical body editing. 3D drag and drop. Keyboard alternate entry for precise control.
• Compute on demand or real time modes.
• Differential compute mode during real-time editing speeds computation of complex models.
• Generalized inversion from starting model.
• Linked windows so that model changes are updated in all open views.
• Grid, line and drill hole modelling.
• Remanence and demagnetization supported.
• Colour code and label attributes for all bodies in a model.

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Watch your bodies adjust themselves on-screen while the inversion is in progress. ModelVision's generalized inversion engine can be started at any time to take over the process of forward modelling. There is a basic assumption that the forward model you have built is a reasonable match with the field data. This makes the job of finding the local least squares minima a much simpler task for the inversion process. You only have to free up the parameters of interest so that the inversion can converge rapidly to a best fit solution. If any parameters become unstable you can halt the inversion process and adjust the parameter manually or revert to your last model.

You can use any combination of body types and parameters in the inversion process. Data compression can be used to reduce the number of data points within the active data subset and speed up the inversion process.

• Map view inversion X,Y,Z freedom.
• Cross-section inversion X,Z freedom.
• Mixed body types.
• Dynamic link between bodies and free parameter list.
• Free ALL for specific attributes.
• Min-max limits for each free parameter.
• Progress bar.
• Manual termination or RMS target.
• Undo by reverting to previous model.
• Data compression.
• Invert on gravity or magnetic data (joint inversion in future release).

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If you are interested in automatic modelling of depth to magnetic basement, then AutoMag is just what you need. By integrating an automatic procedure with a direct modelling system we have been able to remove many of the uncertainties associated with automatic procedures. Any solution can be tested by quickly converting it to its equivalent solid model. Use ModelVision's powerful forward modelling to QC your results and fine tune the parameters. With this option you can build an annotated and contoured depth-to-basement map. Follow-up with ModelVision's inversion tools to produce precision depth models with tight geological constraints.

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ModelVision has been developed to allow the interpreter to apply modelling in the context of large data sets without being forced to model all the data. Even on powerful Unix workstations, 10 lines of data can bring modelling software to its knees. By various methods the interpreter can activate a subset of the lines for modelling and then move the focus around the survey area. Further performance enhancements are achieved by using dynamic compression techniques to pass a reduced number of data points to the modelling engine during computation. As you home in on your target you can increase the sensitivity by using a slider bar. At the modelling level further performance boosts are achieved by using differential mode computing. Recomputation is only applied to that part of the model that has been edited.

In combination, these enhancements increase modelling speeds by factors of up to 10,000.

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• Multi-track
  - Reference track
  - Zoom pan and fit
  - Full curve attribute control for line style and colour
  - Variable area fill option
  - Drag and drop curves from one track to another
  - Dynamic links to models and filter modules
• Contour maps
  - Colour palette selection
  - Contour interval and range
  - Compression option for rapid display
  - Multiple grids using different contour palettes
• Image maps
  - Turn grids into images
  - Drape a contour or stacked profile map on top
  - Colour palette selection
  - Shadow enhancement of surfaces
• Stacked profile and grid profiles
  - Display flight line plots of one or more channels
  - Grid profiles display either rows or columns as stacked profiles
  - Overlay profiles on a flight path or contour map
• Map backdrop for all data layers
  - Tenement
  - Cadastral
  - Interpretation
• Log displays of borehole responses as multi-track or in perspective views
• Presentation or scaled plotting
• Perspective views of models with real time rotation

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Line based filters help separate the contributions of different geological sources and are complimentary to the modelling process. Any of the line filters can be used dynamically in the modelling process. You can filter your field data and apply the same filter as a real time In-line filter to the model output.

• Convolution and FFT filter for line data
  - High, low & band pass filters
  - 1st vertical & horizontal derivative
  - Upward continuation
  - Reduction to the pole
  - Pseudo-gravity
• Specialised convolution filters
  - Moving average
  - Median
  - AGC
  - 2nd horizontal derivative
  - Log 2nd horizontal derivative
  - Square root second horizontal derivative
• 2D Convolution filters for grids
  - ER Mapper compatible - wide range of edge enhancement and specialist filters
  - User defined

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ModelVision has been developed as a multi-platform geophysical modelling package where the look and feel is similar on all systems. This provides the added advantage of one set of training for both the Unix and PC versions. Minor differences exist between the Unix and Windows behaviour but the functionality is equivalent in both systems. Windows offers a wider variety of printer drivers while Unix systems use Postscript for hardcopy output.

• Full graphical user interface
• Windows 3.11, X11 (OpenLook, Motif), Win NT*, Win 95*
• Dynamically linked windows
• Toolbar and Pull down menus

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The ER Mapper image processing system is in wide spread use for the analysis and enhancement of potential field geophysical data. Encom Technology works closely with Earth Resource Mapping to make ModelVision a compatible product. You can use ER Mapper single channel images in ModelVision and export ModelVision Grids as ER Mapper compatible images. You can select traverses from an image in ER Mapper and export them to ModelVision. Encom also supports the following ER Mapper data standards:

• Single band image files (.ers)
• Vector files (.erv)
• RGB palette files (.pal)
• 2D convolution filter kernels (.ker)
• Traverse files (.asc)

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Modelling can be performed on located (x,y,z) data or on profiles extracted from grids or images. ModelVision supports commonly used formats from companies including Encom, Geosoft, and Geopak. Interactive links to ECS, Intrepid or company-specific databases are also available. External links to specialized in-house databases can be added for direct communication with ModelVision.

• Industry standard located (x,y,z) file including Geosoft, Toolkit and generic formats.
• Dynamic database links to Intrepid, Geosoft Oasis* and client data base systems.
• Grid import from ASEG-GXF, Geosoft, Geopak ECS, Intrepid and Encom.
• ER Mapper integration and image/profile links.
• Work session files for capturing your complete working environment in a disk file.
• Backdrop of Encom EGF and ER Mapper .erv files (DXF in Release 1.4).

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Many utilities have been added to ModelVision to round off the tools needed to support a professional modelling system.

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ModelVision is available to run on PCs and on Sun and Silicon Graphics UNIX workstations.

Hardware Supported.

• Microsoft Windows 3.1 on 486 or Pentium PCs. Compatible with Microsoft Windows NT and Windows 95.
• 32 bit Windows NT, Windows 95, Windows 98.
• Sun Sparcstation or equivalent with Solaris 2.
• Silicon Graphics with Irix 5 or later.

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