Inversion QC

Use the Inversion QC option (Geosoft.uxo.gxnet.dll(Geosoft.GX.UXO.UxaInversionQc;Run)*) from the menu AGC Expert User > Static Data Inversion to determine if the inversion results and the sources are valid. For example, if you are able to model the data and if the solution is reasonably beneath the array.

Inversion QC dialog options

Master Database

Master database prefix

Select the optional master database prefix.

Script Parameter: UXANALYZE.MASTER_IMPORT_DBPREFIX

Group

Select the group in the master database.

Default group name is FlagList.

Script Parameter: UXANALYZE. MASTER_GROUP

Databases

Prefix

Select the databases prefix.

Script Parameter: UXANALYZE. DBPREFIX

Target group

Select the target group from the target database.

Script Parameter: UXANALYZE.TARGETGROUP

Source group

Select the source group from the source database.

Script Parameter: UXANALYZE.SOURCEGROUP

Mask channel

Select the mask channel to select which sources the QC metrics are calculated.

Script Parameter: UXANALYZE.TARGETMASK

Low gate

Select from the list the low time gate to be used in the Inversion QC process. Defaults to the low gate used in Dynamic Inversion or to the gate with the first valid time (UXA_GateFirstValidTime).

You may choose to break out a different gate by using the Calculate Size and Decay Channels tool.

Script Parameter: UXANALYZE.LOGATE

Decay gate

Select from the list the decay time gate to be used in the Inversion QC process to determine the decay for an item.

The default value for the decay gate depends on the sensor and is read from the UXA.config file. Defaults to the value used in Calculate Size and Decay Channels, if the tool has been executed.

Script Parameter: UXANALYZE.THRESHOLDGATE

Parameters

Fit coherence

Specify the minimum acceptable fit coherence

Default value is 0.8.

Script Parameter: UXANALYZE. MIN_FIT_COHERENCE

Difference - array position & inverted location (m)

Specify the maximum distance between the array position and the inverted location, in metres.

Default value is 0.4.

Script Parameter: UXANALYZE.MAX_DIFF_ARRAY_INV_LOCATION

Difference - array position & flag location (m)

Specify the maximum distance between the array position and the flag location, in metres.

Default value is 0.75.

Script Parameter: UXANALYZE.MAX_DIFF_ARRAY_FLAG_LOCATION

Difference - flag location & inverted location (m)

Specify the maximum distance between in the flag location and the inverted location, in metres.

Default value is 0.6.

Script Parameter: UXANALYZE. MAX_DIFF_FLAG_INV_LOCATION

Minimum size

Specify the minimum size.

Default value is -1.5.

Script Parameter: UXANALYZE.MIN_SIZE

Maximum decay

Specify the maximum decay; any sources (values in the channel 'UXA_Decay' at the decay gate) that have a decay greater than this value would fail.

Default value is 1.

Script Parameter: UXANALYZE.MAX_DECAY

Application Notes

The Inversion QC tool calculates several metrics to determine if the inversion results, the sources, are valid.

In the source database, a channel named UXA_QC_Inv is created. This channel will contain a 1 for sources that pass, or a dummy (*) for those that fail. The UXA_Mask_QC channel will also be updated to deselect, sources that fail will be set to dummy, so they are not included in subsequent processing.

In the target database, similarly, a channel named UXA_QC_Inv is created. This channel will contain a 1 (or pass) if there is at least one source that passes for that measurement. The UXA_Mask_QC channel will be update and set to dummy (*) when all source for that measurement fail, so the measurement is not included in subsequent processing.

Master Database

In the master database (if selected), the channel UXA_QC_Inv is created (if it doesn't exist).

The channel is populated based on the content of UXA_QC_Inv channel in the target database: it will be set to dummy if all the records in the target database with the same geo ID and flag ID are dummy.

*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.

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