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Quadrapoles tab

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When the dataset is selected from the Schedule window in the explorer, or from one of the menus in the Data Quality Control area, three workspaces become available. They are accessed by the buttons at the top of the screen called Quadrapoles, Electrodes and 3D View.

DQButtonsOn the electrodes and Quadrapoles screens three menus appear at the bottom of the workspace. These are IMPORT SYSCAL BIN,  REMOVE BAD DATAPOINTS and SAVE SCHEDULE. The import syscal menu is only active if you go directly to this screen from the explorer. Rather than using Input schedule under DATA INPUT of the DI Workspace click Import Syscal File under The schedule menu on the Explorer. The remove bad datapoints is for editing data values and is best described in the quadrapoles description.

Quadrapoles1

When a schedule file containing data has been input, either from the data inversion (DI) workspace or the syscal import, the  quadrapole list  is populated. The following columns are visible: ID is simply a count for the data in the list. cA, cB, cM and cN are the cable ID's for the ABMN (quadrapole) electrodes and A, B, M, N are the electrode numbers of the ABMN electrodes. V/I in Ohms is the measured resistance. V/I Rec. (ohm) is the corresponding reciprocal data point (these must be determined as described below). V (in millivolts) is the measured primary voltage. Scrolling to the right other columns are visible depending on exact data measured and calculated. These columns are common:

Quadrapoles2

I (in milliamperes) is the current flow, K is the geometric factor (a multiplier used to calculate apparent resistivity). Rho is the calculated apparent resistivity, q is a quality control factor such as standard deviation, from the measured data (not always present), IP is the induced polarization (not always present) and skip is a QC column. If the skip column shows a 1 then the datapoint will be skipped during inversion. This flag may be set manually be double-clicking the value on the list, or automatically using the REMOVE BAD DATAPOINTS menu.

Remove Bad Datapoints

The REMOVE BAD DATAPOINTS menu allows removal (skipping) of datapoints based on various parameters. First select the parameter, then click Remove Data. Using the Elect. buttons you can remove based on cable ID or electrode ID. Using the Meas. buttons you can remove based on thresholds for values such as V (measured primary voltage), abs(V) the absolute value of measured primary, I (current flow), abs(I), V/I (measured resistance), abs(V/I), K (geometric factor), abs(K), Rho (apparent resistivity), abs(Rho), IP (measured induced polarization, abs(IP), q (measured quality control indicator, abs Rec. Diff (absolute reciprocal difference), % Rec Diff (Percent reciprocal difference). You can also choose to skip any data that do not have a corresponding reciprocal by selecting "Remove no-reciprocals data". Finally you can choose to "Remove duplicated data points".

Each filter that is applied simly adds to the skip list. Data are not removed from the skip list except by using the Skip reset button. The final filtered dataset can be saved using the Save Schedule button.

SaveScheduleThe include IP data switch saves IP data as an extra data column. The Save Terrain info switch saves the ZTerrain information with the electrodes.

 

 



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