Calculate and Display Analytic Signal Grid

Use the Euler 3D > Calculate and Display Analytic Signal Grid dialog option (E3ASIG 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: EULER3D.DX
Input Y-derivative grid	Input Y-derivative grid Script Parameter: EULER3D.DY
Input Z-derivative grid	Input Z-derivative grid Script Parameter: EULER3D.DZ
Output analytic signal grid	Output analytic signal grid Script Parameter: E3ASIG.ASIG
Display AS grid in new map ?	Display analytic signal grid (1) or to the current map (0) Script Parameter: E3ASIG.NEW

Application Notes

Calculation of analytic signal:

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 )

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

Display of analytic signal grid:

If the grids are to be displayed in a new map, an additional dialog box will appear requesting the map name. Map layout, style and title settings may be defined using the MAP OPTIONS button. Pressing the button initializes a series of dialog boxes in which the map settings may be defined. Subsequent maps will default to the settings used.