IGRF Calculation

Use the IGRF Calculation option (geosoft.uxo.gxnet.dll(Geosoft.GX.UXO.UxaIgrf;Run)*) from the AGC Expert User > Utilities menu to calculate IGRF magnetic values.

Average Lat/Long for IGRF Calculation dialog options

Site database

Select/enter the site database name, which should be an existing file.

Script Parameter:UXANALYZE.GDB

Longitude channel

Select the longitude channel from the list of channels in the site database.

Script Parameter:UXANALYZE.LONGCHAN

Latitude channel

Select the latitude channel from the list of channels in the site database.

Script Parameter:UXANALYZE.LATCHAN

Call IGRF

Once clicked, it will call IGRF GX in order to calculate the values for the inclination, declination, and field strength.

Application Notes

This GX determines the average longitude and latitude of the points in the site database, and calls IGRF GX, which calculates the inclination, declination, and field strength. These values will be saved into the workspace to be used in target fitting.

If the entries for site database, or latitude and longitude channels are empty, the latitude and longitude values in IGRF GX should be entered manually.

*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.