PHASEFILT(1)

💖 phasefilt 💖 — PHASEFILT(1)

okay bestie, welcome to the manual page for phasefilt. It's a user command, it's giving GMTSAR, and it's literally called phasefilt. Let's get into it. ✨

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🌸 NAME 🌸

phasefilt — phasefilt

That's it. That's the name. Iconic.

🦋 DESCRIPTION 🦋

This program is part of GMTSAR.

phasefilt [GMTSAR] - Apply adaptive non-linear phase filter

📌 USAGE:

phasefilt -imag imag.grd -real real.grd [-alpha alpha][-psize size][-amp1 amp1.grd -amp2 amp2.grd][-diff][-v]

It applies Goldstein adaptive filter to phase — output: filtphase.grd — or it applies modified Goldstein adaptive filter to phase — outputs: filtphase.grd, corrfilt.grd.

Now the flags, bestie. Do not skip these, they are the whole plot. 💅

• -imag [required] — GMT format file of imaginary component. Yes, required, required required. 🦋
• -real [required] — GMT format file of real component. Also required. The duality of man. 💖
• -alpha — exponent for filter. Usually between 0.0 and 1.5 (0.0 should not filter).
  • default: 0.5
  • [Goldstein filter] (anything above 1.0 may be excessive)
  • alpha < 0 will set alpha = (1 - coherence) [modified Goldstein]
• -psize — patch size for filtering. Must be power of two.
  • default: 32
• -amp1 — GMT format file of amplitude image of image 1. Needed (and applies) modified filter.
• -amp2 — GMT format file of amplitude image of image 2. Needed (and applies) modified filter.
• -diff — Calculate difference between input phase and output phase.
• -complex_out — Write out filtered real and imaginary (filtphase_real.grd and filtphase_imag.grd)
• -v — Verbose.
• -debug — Debug.

Example, because we love a demo:

example: phasefilt -imag imag.grd -real real.grd -alpha 0.5

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🔁 USAGE: (yes, the page does it again, and I'm keeping every crumb)

okay so literally the same section repeats, and I am not about to erase it. Details are sacred. Here it is again, bestie:

phasefilt -imag imag.grd -real real.grd [-alpha alpha][-psize size][-amp1 amp1.grd -amp2 amp2.grd][-diff][-v]

It applies Goldstein adaptive filter to phase — output: filtphase.grd — or it applies modified Goldstein adaptive filter to phase — outputs: filtphase.grd, corrfilt.grd.

• -imag [required] — GMT format file of imaginary component.
• -real [required] — GMT format file of real component.
• -alpha — exponent for filter. Usually between 0.0 and 1.5 (0.0 should not filter).
  • default: 0.5
  • [Goldstein filter] (anything above 1.0 may be excessive)
  • alpha < 0 will set alpha = (1 - coherence) [modified Goldstein]
• -psize — patch size for filtering. Must be power of two.
  • default: 32
• -amp1 — GMT format file of amplitude image of image 1. Needed (and applies) modified filter.
• -amp2 — GMT format file of amplitude image of image 2. Needed (and applies) modified filter.
• -diff — Calculate difference between input phase and output phase.
• -complex_out — Write out filtered real and imaginary (filtphase_real.grd and filtphase_imag.grd)
• -v — Verbose.
• -debug — Debug.

Example again, because the manpage said so:

example: phasefilt -imag imag.grd -real real.grd -alpha 0.5

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mwah 💖 this page is signed off with phasefilt, source/version says phasefilt phasefilt [GMTSAR] - ..., dated May 2024, and the manual name is PHASEFILT(1). bye bestie, go filter some phase ✨