GMT5SAR is an open source (GNU General Public License) InSAR processing system. This service provides standard 2-pass processing of a master product against one or more slave products.

EO sources supported:

  • Sentinel-1 SLC

Output specifications

For each generated interferogram (one per sub-swath) the following output files are provided:

  • Amplitude, phase, correlation, unwrapped phase, filtered phase, LOS displacement — image files in NetCDF format “.grd”
  • Corresponding files after geocoding with suffix “_ll.grd”
  • Postscript plots: “.ps”
  • Preview images “.tiff” and “.png”

This tutorial covers the typical InSAR processing to form an interferogram using two SAR images and a digital elevation model.

The GMT5SAR processing service can also process several pairs master/slave (same master).

Select the processing

  • Login to the platform (see user section)
  • Select the processing service “GMT5SAR InSAR - Sentinel-1 TOPSAR”:

The “GMT5SAR InSAR - Sentinel-1 TOPSAR” panel is displayed with parameters values to be filled-in.


Parameters comes with default pre-filled values which are the same as the ones used in this tutorial, so you may skip the following section and directly use the pre-filled parameters.

Fill the parameters

Slave product reference

  • Select EO Data / Sentinel-1 / SLC as data collection.
  • Type S1B_IW_SLC__1SDV_20170718T041442_20170718T041509_006537_00B7E8_BD0D in the Search Terms field:
  • To access advanced filter functionalities, you can open the Search form on the top left of the map and use filters such as start/end time or specficis ones (associated to the current selected data collection)
  • Drag and Drop the first result in the Slave product reference field:

Master product reference

  • Type S1A_IW_SLC__1SDV_20170724T041510_20170724T041538_017608_01D766_AB23 in the Search Terms field (1):
  • Drag and drop the first result in the Master product reference field:


  • Select the Polarization

Snaphu threshold

  • Select the Snaphu threshold

Run the job

  • Click on the button Run Job and see the Running Job
  • After about 25 minutes, see the Successful Job:
  • Click on the button Show results on map
  • See the result on map: