Lateral Density Inversion

The Lateral Density Inversion function optimizes the lateral density distribution in the selected model layer in order to minimize the misfit for the selected gravity component.

Perform a Lateral Density Inversion

From the Calculate menu, select Lateral Density Inversion. The Lateral Density Inversion dialog appears.
This dialog can also be accessed by right-clicking the model layer in the Layers menu and selecting Lateral Density Inversion.
From the dropdown list, select the Top Surface of Inversion Layer. The lateral density distribution of this layer will be altered.
Enter a Maximum Number of Inversion Iterations. Inversion process will stop after this many iterations, even if the convergence target has not been reached.
Enter the Convergence Limit. Inversion will stop when either the mean error or the standard deviation of the error is less than this limit. Note that under certain conditions, the calculations may not converge at all. The algorithm attempts to detect this and terminate accordingly.
Enter the Lower High-Cut Limit. A cosine roll-off high-cut filter is applied to the error before inverting. This is the beginning of the cosine taper. The default value is equivalent to 0.5 times the Nyquist.
Enter the Upper High-Cut Limit (the short-wavelength end of the taper. The default is the wavelength equivalent to 0.7 times the Nyquist. If you enter numbers that are <= 1.0, they are interpreted as fractions of Nyquist. If you enter numbers that are > 1.0, they will be interpreted as wavelengths (distances) in ground units.
Enter the Regional Offset. This constant will be subtracted from the observed gravity before inverting.
Browse to the load an existing Constraints Grid. Values in this grid control where the inversion surface may change. Values of 0 indicate no change; 1 indicates maximum change.
Optionally, you may click Limits to activate a dialog that specifies the minimum and maximum density values allowed in the resulting density layer. By default, the limits are -5 to +5 g/cm³.
Click Yes to continue.
If prompted, click Yes to recalculate. The calculation is processed.