SBAS(1)

✨ SBAS(1) ✨ — User Commands 💖

okay bestie, gather round 🫶 this is the page for SBAS(1), and it lives in the User Commands manual section. it's a big-brain InSAR time-series girlie and she is that girl. let's go through it together, no skips, every flag accounted for, periodt 💅

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🎀 NAME 🎀

• sbas — sbas

that's literally the whole name section. short queen, we respect her 😌

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🦋 DESCRIPTION 🦋

first line, and it matters: this program is part of GMTSAR. that's it, that's the vibe.

here's the usage, verbatim, don't @ me:

USAGE: sbas intf.tab scene.tab N S xdim ydim [-atm ni] [-smooth sf] [-wavelength wl] [-incidence inc] [-range -rng] [-rms] [-dem]

🌸 input 🌸

• intf.tab — a list of unwrapped (filtered) interferograms 💖. format:

unwrap.grd  corr.grd  ref_id  rep_id  B_perp

• scene.tab — a list of the SAR scenes, in chronological order ⏰. format:

scene_id   number_of_days

note: the number_of_days is relative to a reference date. iykyk.

• N — the number of the interferograms
• S — the number of the SAR scenes
• xdim and ydim — the dimension of the interferograms

💅 the flags 💅

• -smooth sf — smoothing factors, default=0
• -atm ni — number of iterations for atmospheric correction, default=0 (skip atm correction)
• -wavelength wl — wavelength of the radar wave (m), default=0.236
• -incidence theta — incidence angle of the radar wave (degree), default=37
• -range rng — range distance from the radar to the center of the interferogram (m), default=866000
• -rms — output velocity uncertainty grids (mm/yr): rms.grd
• -dem — output DEM error (m): dem_err.grd
• -mmap — use mmap to allocate disk space for less use of memory
• -robust — only work with -atm turnned on (yes, "turnned", that's the manpage's own spelling and we love her for it), estimate velocity with records that has atm correction

🔥 output 🔥

• disp_##.grd — cumulative displacement time series (mm) grids
• vel.grd — linear regressed velocity (mm/yr) grids

⭐ example ⭐

sbas intf.tab scene.tab 88 28 700 1000

📚 REFERENCES 📚

the reading list, bestie, and the ??? bits are the manpage's own mangled quote marks, not me being weird 🙈:

• Berardino P., G. Fornaro, R. Lanari, and E. Sansosti, ???A new algorithm for surface deformation monitoring based on small baseline differential SAR interferograms,??? IEEE Trans. Geosci. Remote Sensing, vol. 40, pp. 2375???2383, Nov. 2002.
• Schmidt, D. A., and R. B??rgmann 2003, Time-dependent land uplift and subsidence in the Santa Clara valley, California, from a large interferometric synthetic aperture radar data set, J. Geophys. Res., 108, 2416, doi:10.1029/2002JB002267, B9.
• Tong, X. and Schmidt, D., 2016. Active movement of the Cascade landslide complex in Washington from a coherence-based InSAR time series method. Remote Sensing of Environment, 186, pp.405-415.
• Tymofyeyeva, E. and Fialko, Y., 2015. Mitigation of atmospheric phase delays in InSAR data, with application to the eastern California shear zone. Journal of Geophysical Research: Solid Earth, 120(8), pp.5952-5963.
• Xu, X., Sandwell, D. T., Tymofyeyeva, E., Gonz??lez-Ortega, A., & Tong, X.(2017). Tectonic and anthropogenic deformation at the Cerro Prietogeothermal step-over revealed by Sentinel-1A InSAR. IEEE Transactions onGeoscience and Remote Sensing, 55(9), 5284-5292.

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🌀 and now the exact same thing AGAIN 🌀

not me glitching — the manpage genuinely prints this whole block twice, so here it is twice, because we keep every detail in this house 🫶

USAGE: sbas intf.tab scene.tab N S xdim ydim [-atm ni] [-smooth sf] [-wavelength wl] [-incidence inc] [-range -rng] [-rms] [-dem]

🌸 input (round two) 🌸

• intf.tab — a list of unwrapped (filtered) interferograms. format:

unwrap.grd  corr.grd  ref_id  rep_id  B_perp

• scene.tab — a list of the SAR scenes in chronological order. format:

scene_id   number_of_days

note: the number_of_days is relative to a reference date ⏰

• N — number of the interferograms
• S — number of the SAR scenes
• xdim and ydim — dimension of the interferograms

💅 the flags (round two) 💅

• -smooth sf — smoothing factors, default=0
• -atm ni — number of iterations for atmospheric correction, default=0 (skip atm correction)
• -wavelength wl — wavelength of the radar wave (m), default=0.236
• -incidence theta — incidence angle of the radar wave (degree), default=37
• -range rng — range distance from the radar to the center of the interferogram (m), default=866000
• -rms — output velocity uncertainty grids (mm/yr): rms.grd
• -dem — output DEM error (m): dem_err.grd
• -mmap — use mmap to allocate disk space for less use of memory
• -robust — only work with -atm turnned on, estimate velocity with records that has atm correction

🔥 output (round two) 🔥

• disp_##.grd — cumulative displacement time series (mm) grids
• vel.grd — linear regressed velocity (mm/yr) grids

⭐ example (round two) ⭐

sbas intf.tab scene.tab 88 28 700 1000

📚 REFERENCES (round two) 📚

• Berardino P., G. Fornaro, R. Lanari, and E. Sansosti, ???A new algorithm for surface deformation monitoring based on small baseline differential SAR interferograms,??? IEEE Trans. Geosci. Remote Sensing, vol. 40, pp. 2375???2383, Nov. 2002.
• Schmidt, D. A., and R. B??rgmann 2003, Time-dependent land uplift and subsidence in the Santa Clara valley, California, from a large interferometric synthetic aperture radar data set, J. Geophys. Res., 108, 2416, doi:10.1029/2002JB002267, B9.
• Tong, X. and Schmidt, D., 2016. Active movement of the Cascade landslide complex in Washington from a coherence-based InSAR time series method. Remote Sensing of Environment, 186, pp.405-415.
• Tymofyeyeva, E. and Fialko, Y., 2015. Mitigation of atmospheric phase delays in InSAR data, with application to the eastern California shear zone. Journal of Geophysical Research: Solid Earth, 120(8), pp.5952-5963.
• Xu, X., Sandwell, D. T., Tymofyeyeva, E., Gonz??lez-Ortega, A., & Tong, X.(2017). Tectonic and anthropogenic deformation at the Cerro Prietogeothermal step-over revealed by Sentinel-1A InSAR. IEEE Transactions onGeoscience and Remote Sensing, 55(9), 5284-5292.

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okay that's the whole page bestie, you ate it, main character energy all the way through 💖 and for the sign-off: this one is sbas, dated May 2024, sitting pretty in section SBAS(1) 🎀 go make some velocity grids, you've got this 🌈⭐