Add Magnetic Profile from a Database Line

Add a new profile of magnetic observations and/or magnetic gradient observations to your model by extracting from a specified line in a Geosoft Database. Specify the existing database file containing your observed data profile. The current X and Y channels and the coordinate system associated with those channels will be displayed.

Magnetic gradient components are calculated at the same station locations as the magnetic calculations.

Selected database

Browse to select the database containing the data to be imported.

X channel

The current X channel in the database (read-only).

Y channel

The current Y channel in the database (read-only).

Coordinate system

The coordinate system associated with the current X and Y channels (read-only).

Distance units

The distance units associated with the coordinate system. All distance channels (horizontal or vertical) in the database are assumed to use these units.

Selected line

Select the line in the database to import from the list.

Elevation channel

The channel containing the station Z-coordinate. These values are assumed to be elevations; (i.e. positive upward) and to match the distance units specified above.

Magnetic channel

The channel containing the observed Magnetic (B) values. Dummies are allowed in this channel, resulting in calculations being performed at this (X,Y,Z) location.

Magnetic units are

Select the units appropriate to the values in the Magnetic channel from the list.

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Btx axis orientation

The orientation of the positive X-axis for the gradient survey, as an azimuth. In a compass-oriented survey, the Btx axis would have an azimuth of 90 degrees. The positive Y-axis would be oriented 90 degrees counter-clockwise from this azimuth.

Btz channel

The channel containing the observed values for the Btz component. Dummies are allowed in this channel, resulting in calculations being performed at this (X,Y,Z) location.

Btx channel

The channel containing the observed values for the Btx component. Dummies are allowed in this channel, resulting in calculations being performed at this (X,Y,Z) location.

Btyy channel

The channel containing the observed values for the Bty component. Dummies are allowed in this channel, resulting in calculations being performed at this (X,Y,Z) location.

Application Notes

The import will convert between coordinate systems if they are defined for both the model and database. If the model coordinate system is not defined, the import will fail. If the database coordinate system is undefined, it is assumed that it matches the coordinate system of the model, as in text imports.

See Also: