Level Mag Sensors

Use the Level Mag Sensors option (Geosoft.uxo.gxnet.dll(Geosoft.GX.UXO.UxoLevelMagSensors;Run)*) from the UXO-Marine Grad > Data Corrections menu to offset one or more data channels and bring them to level with another data channel.

Level Mag Sensors dialog options

Reference sensor channel

Select the reference sensor from the channel list. This sensor will remain untouched.

This is a mandatory field.

Script Parameters:

UXO_LEVEL_MAG_SENSORS.REFERENCE_SENSOR_CHANNEL

Correction method

Select the correction method to be used in the input channel adjustment. One of the following methods may be chosen:

  • Median: For each line, calculates the difference between reference and input sensors, gets the median, adds it to the input sensor and outputs the result to levelled output sensor adjusted channel.
  • Mean: For each line, calculates the difference between reference and input sensors, gets the mean, adds it to the input sensor and outputs the result to levelled output sensor adjusted channel.
  • Constant (a value must be entered if chosen): Adds the entered value to the input sensor and outputs the result to levelled output sensor adjusted channel.

Script Parameter:

  • UXO_LEVEL_MAG_SENSORS.METHOD

Number of additional sensors

Specify the number of additional sensors to be adjusted (levelled). When this value is changed the number of rows in the grid view below (containing the input channel, levelled output channel and constant) is modified to match this value.

The default and minimum value is 1.

Script Parameter: UXO_LEVEL_MAG_SENSORS.NUMBER_ADDITIONAL_SENSORS

Output suffix

Specify the output suffix to automatically populate the levelled output channel with the corresponding input channel appended by the specified suffix.

This process occurs when either a new input channel is selected or the suffix value is updated and, at least, one input channel is set.

  • Adding an output suffix will update all the levelled output channel names in the list that have a corresponding input channel name.

    • Script Parameter: UXO_LEVEL_MAG_SENSORS.OUTPUT_SUFFIX

    Input channel

    Select the input sensor (to be adjusted) from the channel list.

    This is a mandatory field.

    Script Parameter: UXO_LEVEL_MAG_SENSORS.INPUT_CHANNELN, where N starts at 1 up to the number of additional sensors

    Levelled output channel

    Specify a new (or existing) name for the output channel. The adjustments are performed on the input sensor and saved in this channel.

    This is a mandatory field.

  • If at least one of the entered channels already exists, you will be prompted to confirm the channel replacement.

    • Script Parameter:

    UXO_LEVEL_MAG_SENSORS.LEVEL_OUTPUT_CHANNELN, where N starts at 1 up to the number of additional sensors.

    Constant

    Specify the constant value to be used with the Constant method.

    This is a mandatory field if the Constant method is selected. This value is ignored, otherwise.

    Script Parameter: UXO_LEVEL_MAG_SENSORS.CONSTANTN, where N starts at 1 up to the number of additional sensors.

    Application Notes

    Levelling the sensors is useful to ensure proper calculation of gradients/derivatives (should be around zero), and to ensure the Analytic Signal will be cleaner (levelled between survey lines, with a base close to zero for all lines) to enable better target picking.

    *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.