---
name: "sbas"
section: "1"
platform: "linux"
package: "gmtsar-core"
version: "6.5+ds-3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/sbas"
---

# sbas(1)

sbas

## NAME

sbas - sbas

## DESCRIPTION

This program is part of GMTSAR.

-

  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

  **--**  list of unwrapped (filtered) interferograms:

- format:

  unwrap.grd  corr.grd  ref\_id  rep\_id  B\_perp

- scene.tab

  **--**  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

- **-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:

- 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: 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.

-

  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

  **--**  list of unwrapped (filtered) interferograms:

- format:

  unwrap.grd  corr.grd  ref\_id  rep\_id  B\_perp

- scene.tab

  **--**  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

- **-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:

- 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: 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.