Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991
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1. Availability of Sentinel-1 Data
2. How to Download from ASF
3. Sentinel-1 SAR Modes
4. Naming Convention
5. About Precision State Vectors  (download here

Also see Tutorials, Image Quality, Data NewsDocuments & ToolsWhat Is TOPSAR?, and Observation Plans.

1. Availability of Sentinel-1 Data

European Space Agency (ESA)Alaska Satellite
Facility (ASF) DAAC
Sentinel-1 data are available from ESA from a Rolling Archive that delivers data within 24 hours of acquisition and maintains recent months of data. Registration is required, and terms & conditions apply.ASF maintains a complete archive of processed Sentinel-1 data, available within three days of acquisition. Registration is required, and terms & conditions apply. Data feeds are available.

2. How to Download Sentinel-1 Data from ASF: Vertex (preferred), API, or Earthdata


  1. The Get Started guide offers additional information on accessing data from ASF.
  2. Search results for Sentinel granules are bundled, so regardless of the processing level of the original search granule (RAW, SLC, GRD or OCN), all other related granules are shown as well. The search result list for any selected granule includes the ground range detected (GRD) product, because the associated GRD browse image, when available, provides the user with the most accurate information about the data coverage.

Vertex (preferred)

Synthetic aperture radar (SAR) Vertex search engine image

Vertex is the Alaska Satellite Facility's data portal for remotely sensed imagery of Earth. The ASF Datapool and the ASF Subsetter offer SAR data products for immediate download.


Synthetic apertur radar ASF API image
ASF API Download Tool

The ASF Application Programming Interface (API) Download Tool facilitates the search for, visualization, and bulk delivery of ASF SAR images and metadata.


Synthetic aperture radar ASF Reverb image

3. Sentinel-1 SAR Modes

Sentinel-1A and Sentinel-1B satellites carry C-band SAR instruments to provide an all-weather, day-and-night supply of imagery of Earth’s entire surface every 6 days.

Extra Wide Swath (EW)Interferometric Wide Swath (IW)Stripmap (SM)Wave (WV)
Acquired with TOPSAR using 5 sub-swaths instead of 3, resulting in lower resolution (20m-x-40m). Intended for maritime, ice, and polar-zone services requiring wide coverage and short revisit times.Acquired with TOPSAR. Default mode over land; 250km swath width; 5m-x-20m ground resolution.Used in rare circumstances to support emergency-management services, 5m-x-5m resolution over an 80km swath width.

Default mode over oceans; VV polarization. Data acquired in 20km-x-20km vignettes, 5m-x-20m resolution, every 100km along the orbit.

4. Naming Convention

The figure below illustrates the Sentinel-1 granule naming convention. For more information, see the Sentinel-1 Technical Guide. Additional resources are listed in Documents & Tools.

Sentinel-1 synthetic aperture radar (SAR) naming convention

5. Precision State Vectors

Precision State Vector Links

  • The Precise Orbit Determination (POD) service for SENTINEL-1 provides Restituted orbit files and Precise Orbit Ephemerides (POE) orbit files. POE files cover approximately 28 hours and contain orbit state vectors at fixed time steps of 10-second intervals. Files are generated one file per day and are delivered within 20 days after data acquisition.
  • Users of these vectors may want to refer to the Sentinels POD Service File Format Specifications available on the Documents & Tools page. 
Sentinel-1A Precision State Vectors
ESA Sentinel-1 Quality Control page
ESA FOS Predicted Orbit page

Guide to File Names

IPF Auxiliary Data Files
  L1 Processor Parameters  aux_pp1
  Calibration Auxiliary Data  aux_cal
  Instrument Auxiliary Data  aux_ins
  L2 Processor Parametersaux_pp2
Orbit Files
  FOS Predicted Orbit  mpl_orbpre
  POD Precise Orbit Ephemerides  aux_poeorb
  POD Restituted Orbitaux_resorb
  POD Restitude Attitudeaux_resatt
Get SAR Data

Get SAR Data

Select and download SAR data online using Vertex.

Use the ASF API for downloading SAR data via a command line.