Smooth Derivative Grids

Use the Smooth Derivative Grids option (UXSMTHTF GX) to smooth vertical and horizontal derivative grids before the calculation of analytic signal grid.

Smooth Derivative Grids dialog options

Input X-derivative grid

input X-derivative grid to smooth

Script Parameter: UXSMTHTF.DX_GRIDIN

Input Y-derivative grid

input Y-derivative grid to smooth

Script Parameter: UXSMTHTF.DY_GRIDIN

Input Z-derivative grid

input Z-derivative grid to smooth

Script Parameter: UXSMTHTF.DZ_GRIDIN

Output smoothed X-derivative grid

output smoothed X-derivative grid

Script Parameter: UXSMTHTF.DX_GRIDOUT

Output smoothed Y-derivative grid

output smoothed Y-derivative grid

Script Parameter: UXSMTHTF.DY_GRIDOUT

Output smoothed Z-derivative grid

output smoothed Z-derivative grid

Script Parameter: UXSMTHTF.DZ_GRIDOUT

No. of passes of smoothing filter

Specify the number of passes of smoothing (Hanning) filter to apply to the grid so that low amplitude, high frequency ‘noise’ targets will not be picked. More filter passes tend to reduce the number of peaks found. The default is to apply the filter 3 times.

Script Parameter: UXSMTHTF.PASS

Application Notes

This dialog provides you with the option of filtering the derivative grids prior to the calculation of the analytic signal. This is generally used to remove very high frequency noise from the grids.

Hanning Filter

Hanning smooth filter is a 9-point (3x3) filter with the following coefficients:

0.06

0.10

0.06

0.10

0.36

0.10

0.06

0.10

0.06