Level Sensor Data

Use the Level Sensor Data option (Geosoft.uxo.gxnet.dll(Geosoft.GX.UXO.UxaLevelData;Run)*) to subtract the background for the advanced sensors. 

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

UX-Analyze extension:

  • AGC Static Data
  • AGG Dynamic Data > Drift and Background Removal
  • AGC Expert User > Static Data Prep and QC
  • AGC Expert User > Dynamic Data Prep and QC

Level Sensor Data dialog options

Survey database prefix

Specify the prefix for the survey databases (e.g., SAM, SFR).

Script Parameter:UXANALYZE.LEVEL_SURVEY_DBPREFIX

Group name

Select the group name.

Script Parameter:UXANALYZE.LEVEL_SURVEY_GROUP

Mask channel

Select the mask channel.

Script Parameter:UXANALYZE.LEVEL_SURVEY_MASKCHAN

Monostatic coil

Select the coil name from the list of X, Y, and Z. This selection determines which receiver coils data will be leveled.

This entry is enabled only when dynamic advanced data is being leveled.

Script Parameter:UXANALYZE.LEVEL_MONOSTATIC_COIL

Sensor channel suffix

Select the sensor channel suffix, which determines which data channels will be leveled.

This entry is enabled only when dynamic advanced data is being leveled. Default value is NORM.

Script Parameter:UXANALYZE.LEVEL_SENCHAN_SUFFIX

Sensor channel

Select the sensor channel.

This channel should exist in both anomaly chip and background databases.

This entry is enabled only when static (cued) advanced data is being leveled.

Script Parameter:UXANALYZE.LEVEL_RAWSENCHAN

Sensor channel suffix - leveled

Specify the sensor channel suffix, which will be added to the leveled data channel(s).

Script Parameter:UXANALYZE.LEVEL_LEVCHAN_SUFFIX

Sensor channel - leveled

This read-only field shows the name of the leveled sensor channel(s).

Background database prefix

Select the prefix for the background databases (e.g., SBG, SRB).

Script Parameter:UXANALYZE.LEVEL_BACKGROUND_DBPREIFX

Group name

Select the group name.

Script Parameter:UXANALYZE.LEVEL_BACKGROUND_GROUP

Mask channel

Select the mask channel.

Script Parameter:UXANALYZE.LEVEL_BACKGROUND_MASKCHAN

Background Selection Method

Background Selection Method determines the proper line/group in the background database for each line/group in the anomaly chip database.

  • Time & Location - When selected, the associated entries will be activated. If no grouping tolerance (m) is specified, the background with the closest time (hrs) within the threshold is picked.
    The default value for time threshold is 2.
    The default value for the grouping tolerance is 1.

    If the grouping tolerance (m) is entered:

    • The backgrounds within the time threshold are picked (set 1)

    • From all the backgrounds, the physically closest background to the target is found

    • From this background, all other backgrounds within the grouping tolerance are found (set 2)

    • From the set 2, the closest one in time will be picked

    • If there are no backgrounds within the time threshold the tool will issue a warning.

  • Time - The default time threshold is 2.
  • Location - When selected, the closest background to the anomaly data is selected from the background database.

Script Parameter:UXANALYZE.LEVEL_CALC_METHOD

Application Notes

As part of the acquisition procedure for cued and dynamic data collection with the advanced sensors, background measurements are recorded at different locations within the site and at various times. Background areas are identified as areas where there is no significant anomalous response above the noise envelop. The background data format is identical to that of anomaly data.

The background is subtracted from the anomaly data based on either location (closest background to target) or time (background with closest time), and background-removed data are saved as new channel(s) in the anomaly chip database and passed through to the inversion algorithms.

The background noise, or the difference between the closest background to the data and the closest background to the first one, is also saved as a new channel, UXA_Noise_Floor, in the anomaly chip database. Note that the UXA_Noise_Floor channel is only created when working in Static mode.

The background group/line ID, background database name and background line name are recorded in the site database under three channels, UXA_Background_ID, UXA_Background_Database and UXA_Background_Line. In case of static data, the location offset and the time offset between the background and measurement are also recorded in the target database under these channels: UXA_BACKGROUND_LOCATION_OFFSET and UXA_BACKGROUND_TIME_OFFSET.

The tool goes through all the non-masked survey lines, finds the closest group/line in the background database, and subtracts the background from the signal.

*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: