| ERTLab | > | 2. Working Environment | >  Resistivity/IP starting models

Resistivity/IP starting models

| << | >> |

Make Mesh ExplorerChoose make Make Resistivity/IP Model from the Explorer window. The resistivity and IP model workspace is presented.

The background resistivity and background IP values are usually all that are required for an inversion. Occaisionally the inversion needs a better place to start, and for forward modeling targets must be placed. For these reasons the resistivity anomaly  and IP anomaly frame is presented.

Anomalies are entered as rectilinear regions using the dimension extents in the Insert Anomaly area. The extent of the foreground region is presented for reference. A resistivity and IP value is entered for each anomaly, however these anomalies are maintained separately and do not have to match. Anomalies are deleted independantly from the resistivity and IP areas by pushing the IP and resistivity buttons. To delete an anomaly, select it using the mouse, then push delete anomly. Anomaly shapes other than rectilinear must be built using a series of rectilinear anomalies. To make this easier, each subsequent anomaly overwrites the previous anomaly in areas of overlap.

When adding anomalies to a topographicaly distorted grid it is usually best to add the anomalies to the flat grid first. This is done using the checkbox. Otherwise jagged edges might appear as the software choses a higher elevation element to fill with the anomaly. Anomalies must completely fill an element, and elements are not distorted to the accomodate the anomalies, so the ultimate anomaly present in the mesh may not be exactly the anomaly entered. Please view the mesh prior to modeling to ensure the expected result.

Resistivity and Ip Model


 



|© 2006 Geostudi Astier srl and Multi-Phase Technologies LLC|