| ERTLab | > | 3. Survey Design | > Forward Set up |
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Forward Setup
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Once loaded a schedule file with the electrodes and quadrupoles, set the appropriate forward modeling parameters before running the forward modeling. The forward modeling parameters are set by selecting the item FM set up (or Forward Solver set up for a Data Inversion session) from the Explorer menu.
A series of 2 tabbed windows is presented. In the main setup we set the
Omega. The default 1.6 is usual. Then the
tolerance (smaller numbers result in more computational effort). We
also set the Maximum number of
iterations. Larger numbers require more computational effort. Numbers
between 200 and 400 are typical.
In the boundary conditions tab we set the
Boundary type for X, Y and negative Z directions. The positive Z
direction is always Neuman (no flow). Neuman may also be used for certain
ungrounded lab experiments, and Direchlet may be used to model grounded
electrodes. Finally the location of the virtual source may be explicitly
identified.
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|© 2006 Geostudi Astier srl and Multi-Phase Technologies LLC| |