Decay Display - QC

Use the Decay Display - QC option (Geosoft.uxo.gxnet.dll(Geosoft.GX.UXO.UxaDecayDisplayQc;Run)*) to plot the measured decay of the coils from the advanced EM sensors, such as TEM2x2 and MetalMapper.

ClosedExpand to see the locations (menus) where this option is available.

UX-Analyze extension:

  • AGC Static Data > Sensor Tests and QC Tools
  • AGC Expert User > Static Data Prep and QC

Decay Display - QC dialog options

Databases

Prefix

Specify the databases prefix.

Script Parameter:UXANALYZE.DD_PREFIX

Display

Select the way the data is displayed. Available options are:

  • Individual: A plot is created for each measurement.
  • Overlaid: All selected measurements (by the mask channel) are overlaid on a single plot.
  • Overlaid by location ID: All selected measurements (by the mask channels) are overlaid on a plot per each location ID.

Default: Individual.

Script Parameter:UXANALYZE.DD_DISPLAY_ITEMS

Target group

Select the target group from the list.

Default: Target

Script Parameter:UXANALYZE.TARGETGROUP

ID channel

Select the ID channel using the list. For all data types except backgrounds, this is usually the Target ID; for background use the Background ID.

Default: UXA_Target_ID

Script Parameter:UXANALYZE.TARGETID

Mask channel

Select the mask channel using the list.

Default: UXA_Mask

Script Parameter:UXANALYZE.TARGETMASK

Location ID channel

Select the location ID channel from the list of channels in the survey database.

This field is enabled only when Overlaid by location ID is selected as the Display option.

Default channel: UXA_BG_LOCATION.

Script Parameter:UXANALYZE.LOCATIONIDCHAN

Sensor channel

Select the sensor channel using the list.

Script Parameter:UXANALYZE._SENCHAN

Low gate

Select the low gate value.Typically, the first usable (not effected by the primary) gate.

Script Parameter:UXANALYZE.LOGATE

High gate

Select the high gate value.Typically, the last available gate.

Script Parameter:UXANALYZE.HIGATE

Tx coil channel

Select the transmitter coil (Tx) channel from the list of channels in the Data database.

Script Parameter:UXANALYZE.TXCOILCHANL

Rx coil channel

Select the receiver coil (Rx) channel from the list of channels in the Data database.

Script Parameter:UXANALYZE.RXCOILCHAN

Output Plot

Colour table

Select the colour table file to use in your output image, from the C:\Program Files\Geosoft\Desktop Applications \tbl\geophysics folder.

Plot prefix

Specify an image prefix to uniquely name your plots.

Script Parameter:UXANALYZE.DD_MAP_PREFIX

Plot name

This field is read only; it displays the file path.

Script Parameter:N/A

Plots to generate

Select which transmitter and receiver pairs will be plotted: coaxial, coincident, monostatic, a specific pair or all pairs. See Applications Notes below for more details.

Default: All

Script Parameter:UXANALYZE.DD_MAP_ALL

  • 0 All
  • 1 Monostatic
  • 2 Specific
  • 3 Coincident
  • 4 Coaxial

Data range

Data range determines the vertical extent of the plots.

Enter the range manually or use the Calculate button button to retrieve it from the Data database. All measurements will be considered in calculating the minimum and maximum values.

If left blank, the default values will be retrieved from the survey database.

Min and max values should be greater than 0.001 as the plots have logarithmic axes.

Script Parameters:
   UXANALYZE.DD_DATA_MIN
   UXANALYZE.DD_DATA_MAX

Overlay background noise

If selected, the background noise will be overlaid on the output image.

The background noise channel, UXA_Noise_Floor, is created by executing Level Sensor Data.

Default: Selected if UXA_Noise_Floor exists.

Script Parameter:UXANALYZE.DD_OVERLAY_BKG_NOISE

Save plot as map

If selected, the plot will also be saved as a MAP file.

When using Overlaid or Overlaid by location ID, creating a map and using the data-linking cursor can be helpful in determining which measurements are outliers.

  • This option may be disabled depending on the Display selection.

    • Script Parameter:UXANALYZE.DD_EXPORT

    Application Notes

    For a measurement, the Decay Display – QC plots allow you to view the transient data for various transmitter and receiver combinations. This is useful when reviewing the data for quality control. To simplify the plot, you can select from several standard combinations or pairs:

    • Specific – the plot includes a single graph for the selected pair.
    • Coaxial – the plot includes graphs for each pair that have the same normal vector; the coils are in the same direction.
    • Coincident – the plot includes graphs for each pair that are coincident or collocated; the coordinates of the center of both coils are the same.
    • Monostatic – the plot includes graphs for each pair that are coaxial and coincident.
    • All – the plot includes graphs for all pairs.

    If the background or survey quality control statistics have been calculated, the graph is highlighted (yellow) for the transmitter-receiver combinations that fail the QC statistics. In the ‘Data’ database, the combinations are indicated in the QC flag channels; that is equal to 1.

    The QC flag channels are:

    • UXA_Saturated_Flag
    • UXA_Flatlined_Flag
    • UXA_Current_Flag
  • To create plots for the measurement that fails one of the QC metrics, use the QC flag channel (from the ‘Target’ database) as the mask channel.

    • Leveling the sensor data, calculates the background noise at the site (channel UXA_Noise Floor in the Data database). It is useful to overlay this on the graphs by selecting Overlay background noise.

    The plots are named using the conventions outlined below, where: [PREFIX] is the prefix entered in the Plot Prefix entry, [GROUP] is the Data database line/group name, [TXINDEX] is the transmitter coil index retrieved from the Tx coil channel, and [LOCATION_ID] is the location ID from the Location ID channel.

    • For individual measurements:
      • [PREFIX]_[GROUP].png, if the image contains the data for the same transmitter and receiver coils.
      • [PREFIX]_[GROUP]_Tx[TXINDEX].png, if each transmitter coil is plotted in a separate image.
      • [PREFIX]_[GROUP]_all.png, if the image contains all transmitter and receiver coils.
    • For overlaid measurements:
      • [PREFIX]_overlaid.png, if the image contains the data for the same transmitter and receiver coils.
      • [PREFIX]_overlaid_Tx[TXINDEX].png, if each transmitter coil is plotted in a separate image.
      • [PREFIX]_overlaid_all.png, if the image contains all transmitter and receiver coils.
    • For overlaid measurements by location ID:
      • [PREFIX]_[LOCATION_ID]_overlaid.png, if the image contains the data for the same transmitter and receiver coils.
      • [PREFIX]_[LOCATION_ID]_overlaid_Tx[TXINDEX].png, if each transmitter coil is plotted in a separate image.
      • [PREFIX]_[LOCATION_ID]_overlaid_all.png, if the image contains all transmitter and receiver coils.

    *The GX tool will search in the "gx" folder. The GX.Net tools, however, are embedded in the Geosoft.uxo.gxnet.dll located in the bin folder. If running this GX interactively, bypassing the menu, first change the folder to point to the bin folder, then supply the GX.Net tool in the specified format.

    See Also: