Calculate and Display Analytic Signal Grid

Use the Calculate and Display Analytic Signal Grid option (UXASIG GX) to compute the analytic signal grid from existing derivative grids.

Calculate Analytic Signal dialog options

Input X-derivative grid	Input X-derivative grid Script Parameter: UXASIG.DX
Input Y-derivative grid	Input Y-derivative grid Script Parameter: UXASIG.DY
Input Z-derivative grid	Input Z-derivative grid Script Parameter: UXASIG.DZ
Output analytic signal grid	Output analytic signal grid Script Parameter: UXASIG.ASIG
Display analytic signal grid	Display analytic signal in a single grid (1), colour shaded grid (2) or don't display (0) Script Parameter: UXASIG.DISPL
Display colour bar	Display colour bar vertically (1), horizontally (2) or don't display (0) Script Parameter: UXASIG.COLORBAR

Application Notes

The analytic signal creates positive, body centered anomalies and also is useful in locating the edges of magnetic source bodies, particularly where remanence and/or low magnetic latitude complicates interpretation.

The analytic signal is the square root of the sum of the squares of the derivatives in the x, y, and z directions:

asig = sqrt ( dx*dx + dy*dy + dz*dz )

If the grids are to be displayed, and no map is current, an additional dialog box will appear requesting a map name.