Alaska Satellite Facility
Delivering Remote Sensing Data Since 1991
Find ERS-1 Data

European Remote Sensing Satellite -1

ERS-1 SAR Data

ERS-1 data available through ASF DAAC.
      Coverage map showing ERS-1 data in the ASF archive

NASA's provision of the European Space Agency’s (ESA) European Remote Sensing satellites (ERS-1 and ERS–2) Synthetic Aperture Radar (SAR) data archive via the ASF DAAC is now free and open by agreement between NASA and ESA. As part of the Earth observation Heritage Data Program (LTDP+), the ERS-1 and -2 missions provide scientists with historically accurate and easily accessible information to help further understand the dynamics of our planet. 

ASF holds a subset of all ERS data.

Dataset Description:

  • SAR — synthetic aperture radar
  • 1991-2000
  • Primarily imagery within the ASF and the McMurdo, Antarctica, station masks
  • Datapool contains ASF standard beam odd frames, as well as the first and last frame of each imaged swath
  • Flew in tandem with ERS-2 for 9 months in 1995/1996; data suitable for interferometry
Data Format:

  • CEOS — Level 0 and Level 1 framed 

Downloadable Products:

  • Level 0 (unprocessed/raw data)
  • Level 1 (amplitude — processed images)

Custom Processing — Request data via the User Support Office,

  • Complex (single look complex, SLC)
  • Level 1 (amplitude images — even numbered frames)

ERS-1 SAR Technical Specs

ERS synthetic aperture radar (SAR) provides high resolution, two-dimensional images. Image data were acquired for a maximum duration of approximately 10 minutes per orbit.

Standard Mode
Frequency/wavelength5.3GHz/C-band 5.6cm
Spatial Resolution26m in range (across track)
Between 6m and 30m in azimuth (along track)
Swath Width100km
Off-Nadir Angle21°

Read more on the ESA website.

Mission Phases

The ERS-1 and ERS-2 mission phases are listed below. For more information on each phase, see the Delft University of Technology website, which retrieved the information originally from ESA/ESRIN:


A: Commissioning Phase: 25-Jul-91/10-Dec-91
B: Ice Phase: 28-Dec-91/30-Mar-92
C: Roll Tilt Mode Campaign: 4-Apr-92/13-Apr-92
D: Multidisciplinary Phase: 14-Apr-92/21-Dec-93
E: Second Ice Phase: 23-Dec-93/10-Apr-94
F: First Geodetic Phase: 10-Apr-94/28-Sep-94
G: Second Geodetic Phase: 28-Sep-94/21-Mar-95
H: Tandem Phase: 21-Mar-95/5-Jun-96

ERS-2, 29-Apr-96/5-Sept-2011

ERS-2 had one multi-disciplinary phase planned, but in early 2011, ESA changed the satellite orbit so SAR images of the Antarctic could be recorded with the same viewing angle every three days rather than every 35 days.

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.