FFT 2D
Compute the 2D FFT with optional windowing and mean/plane subtraction. Outputs log magnitude, magnitude, phase, and PSDF as separate channels. Equivalent to gwy_data_field_2dfft / gwy_data_field_2dpsdf.
Inputs
| Name |
Type |
Required |
Description |
| field |
DATA_FIELD |
Yes |
Input spatial-domain field |
Outputs
| Name |
Type |
Description |
| log_magnitude |
DATA_FIELD |
log(1 + |
| magnitude |
DATA_FIELD |
|
| phase |
DATA_FIELD |
Phase angle of the 2D FFT in radians, centered on DC |
| psdf |
DATA_FIELD |
2D power spectral density function |
Controls
| Name |
Type |
Default |
Description |
| windowing |
dropdown |
hann |
Window function applied before FFT: hann, hamming, blackman, or none |
| level |
dropdown |
mean |
Pre-processing: subtract mean, subtract plane, or none |
Limitations
- Output fields are in the frequency domain; physical units on axes are spatial frequency (1/m).
- Phase output uses the raw FFT phase and is sensitive to field origin; it is most useful when paired with the Inverse 2D FFT node.
