Sentinel-1 – Documents and Tools

Resources include product specification documents, dataset citation information for scientists using Sentinel-1 synthetic aperture radar (SAR) data, and references for relevant scientific literature. …

Sentinel-1 – Instrument

Launches:
  • Sentinel-1B: Soyuz rocket, launched 25 April 2016, from Kourou, French Guiana
  • Sentinel-1A: Soyuz rocket, launched 3 April 2014, from Kourou, French Guiana

Orbit: Polar, sun-synchronous at an altitude of 693 km

Revisit time: Six days with two-satellite constellation of Sentinel-1A and 1B. Before 1B launched, revisit time for Sentinel-1A alone was 12 days.

Instrument: C-band synthetic aperture radar (SAR) at 5.405 GHz

Operational Modes
  • Interferometric wide-swath (IW) at 250 km and 5×20 m resolution, using TOPSAR
  • Wave (WV) images of 20×20 km and 5×5 m resolution (at 100 km intervals)
  • Stripmap (SM) at 80 km swath and 5×5 m resolution
  • Extra wide swath (EW) of 400 km and 20×40 m resolution, using TOPSAR
Polarization
  • Supports operation in single polarization (HH or VV) and dual polarization (HH+HV or VV+VH)
  • Polarization implemented through one transmit chain (switchable to H or V) and two parallel receive chains for H and V polarization
  • SM, IW and EW are available in single (HH or VV) or dual polarization (HH+HV or VV+VH)
  • WV is single polarization only (HH or VV)

Receiving stations: SAR data: Svalbard, Norway; Matera, Italy; Maspalomas, Spain; and via laser link through EDRS (European Data Relay System)

Telemetry, tracking and command: via Kiruna, Sweden

Main applications: Monitoring sea ice, oil spills, marine winds and waves, land-use change, land deformation, and to respond to emergencies such as floods and earthquakes

Mission: Developed, operated, and managed by various ESA establishments

Life: Minimum of seven years

Satellites: 2.8 m long, 2.5 m wide, 4 m high with 2×10 m-long solar arrays and a 12 m-long radar antenna

Mass: 2300 kg (including 130 kg fuel)

Funding: ESA Member States and the European Union Prime contractors: Thales Alenia Space, Italy, for the satellite; Airbus Defence and Space, Germany, for the SAR instrument

Content on ASF’s Sentinel web pages is adapted from the European Space Agency (ESA) Sentinel website.

This time-lapse video shows Sentinel-1A being prepared for launch and its liftoff on 3 April 2014 from Europe’s Spaceport in French Guiana. Credit: ESA – S. Corvaja,  M. Pedoussaut, 2014.

Sentinel-1B launches on 25 April 2016 from Europe’s Spaceport in French Guiana. © ESA/CNES/Arianespace.

Sentinel-1 – Applications

With ongoing, all-weather, day-and-night, global Earth data, the Sentinel-1 mission facilitates monitoring and mapping of sea ice, oil-spills, land-surface motion, humanitarian crises, and more….

Copyright ESA 2014

Sentinel-1

The Sentinels are a new fleet of European Space Agency (ESA) satellites, developed to deliver a wealth of data and imagery central to Europe’s Copernicus program….

ALOS PALSAR – How to Cite

Citing ALOS PALSAR Data or Imagery

Cite datasets in publications such as journal papers, articles, presentations, posters, and websites. Include the DOI when available (each RTC ALOS PALSAR dataset processed by ASF has an assigned DOI). Please send copies of, or links to, published works citing data, imagery, or tools accessed through ASF to [email protected] with “New Publication” on subject line.

Type of Dataset Format Example
ALOS PALSAR L1.0 or L1.5 Dataset: ©JAXA/METI ALOS PALSAR [dataset name] [year of data acquisition]. Accessed through ASF DAAC, [link to website or insert comma and spell out in print: https://asf.alaska.edu] [day/month/year of data access] Dataset: © JAXA/METI ALOS PALSAR L1.0 2007. Accessed through ASF DAAC 11 June 2015.
ALOS PALSAR RTC Dataset: [creator credit, year created], [dataset name]; Includes Material © JAXA/METI [year of data acquisition]. Accessed through ASF DAAC, [link to website or insert comma and spell out in print: https://asf.alaska.edu] [day/month/year of data access]. DOI: [DOI] Dataset: ASF DAAC 2015, ALOS PALSAR_Radiometric_Terrain_Corrected_low_res; Includes Material © JAXA/METI 2007. Accessed through ASF DAAC 11 November 2015.
DOI: https://doi.org/10.5067/JBYK3J6HFSVF

Crediting ALOS PALSAR Imagery

Include appropriate credit with each image shown in publications such as journal papers, articles, presentations, posters, and websites.

Type Format Example
Imagery, primary or derivative ©JAXA/METI [year of data acquisition]. © JAXA/METI 2007.
Imagery, value added [creator credit, year created]; Includes Material © JAXA/METI [year of data acquisition]. ASF DAAC 2014; Includes Material © JAXA/METI 2007.

ALOS PALSAR RTC Datasets and DOIs

Dataset DOI
PALSAR_Radiometric_Terrain_Corrected_low_res 10.5067/JBYK3J6HFSVF
PALSAR_Radiometric_Terrain_Corrected_high_res 10.5067/Z97HFCNKR6VA
L1.0_PALSAR 10.5067/J4JVCFDDPEW1
L1.1_PALSAR 10.5067/PAFUZQHBZF3A
L1.5_PALSAR 10.5067/NXY378J3DFZQ

ALOS PALSAR – Terms and Conditions

ALOS PALSAR Standard Product License Agreement

The Alaska Satellite Facility (ASF) grants the End User use of Advanced Land Observing Satellite (ALOS) PALSAR data if the End User accepts and agrees to the following ALOS PALSAR Standard Product End User License Agreement. The End User will be deemed to have accepted and agreed to the terms and conditions if the End User starts using ALOS PALSAR data including but not limited to downloading, installing, manipulation or other action.

Section 1 Definitions

1. “End User” means the person, legal business entity, public entity or any other legal entity who obtains the Product and is considered to have accepted this End User License Agreement. In the case of a public entity, the End User is deemed to be only the part, division, etc. of the public entity located at the address to which the Product is supplied, unless otherwise agreed upon by ASF in writing and in advance.

Standard Product – Level 1 Data (CEOS format) PALSAR Level 1.0, 1.1, 1.5

Derivative Work Product – A processed product using the Standard Product which retains the original pixel structure and can be converted back to the original data or a processed product that does not retain the original pixel structure and cannot be converted back to the original data , with the exception of value-added products

Value Added Product (VAP) – A modified Standard or Derivative Work Product with high-level processing that cannot be converted back to the original product. The high-level processing includes data analysis or combining multiple-satellite data, image processing based on external information, and physical quantity conversion.

2. “Product” means any ALOS satellite data product supplied by ASF.  Product is classified as standard product, Derivative-work Product and Value Added Product (VAP). Definition of the three product types is shown below.

3. “JAXA” means the Japan Aerospace Exploration Agency.

4. “METI” means the Japanese Ministry of Economy, Trade, and Industry.

5. “Related Parties” means the parties that have been involved in the creation, production, distribution or delivery of the Product.

Section 2 Permitted Uses

 1. The End User shall utilize the Product for peaceful purposes only.

 2. The End User may redistribute the Product provided the data source is attributed to JAXA/METI.

Section 3 Prohibited Uses

 1. The End User shall not use the Product other than for peaceful purposes.

 2. The End User shall not delete, obscure, remove or alter any copyright notice that is contained in or appears on the Product.

 Section 4 Intellectual Property Right and Copyright Notice

 1. The End User confirms that JAXA and METI own all intellectual property rights, including copyrights, for ALOS PALSAR Standard and Derivative-work products.

 2. The End User owns all intellectual property rights, including copyrights, which result from the End User’s act of interpretation, adaptation, authorship or any other work on the Standard Product resulting in the creation of a VAP. All VAP products must be accompanied with the copyright notice.

 3. The End User agrees that any embodiment of the Product permitted under this agreement shall contain the following copyright notice.  The copyright notice shall be prominently displayed and the [Year] field correctly filled with a numerical value corresponding to the year of raw data acquisition.

    Copyright Notice

    Standard Product – ©JAXA,METI [Year]    Derivative Work Product – ©JAXA,METI [Year]    Value Added Product – Includes Material ©JAXA,METI [Year]

Section 5 Limited Warranty – Disclaimer

 1. Neither ASF nor the Related Parties, if any, warrants that the Product is free of bugs, errors, defects or omissions.

 2. The Product is provided as is with no warranty of merchantability or fitness for a particular purpose.

 3. ASF and the Related Parties shall have no liability to the End User for any damage suffered by the End User or any third party, as a result of using ALOS PALSAR products. This damage is including but not limited to consequential loss and lost earnings.

Section 6 Modification of this Agreement

ASF reserves the right to modify this agreement if necessary and the modified agreement will govern. In the case of modification ASF will announce on ASF internet site.

Section 7 Governing Law and Jurisdiction

This End User License Agreement shall be governed by the laws of the United States of America.

ALOS PALSAR RTC Product License Agreement

The Alaska Satellite Facility (ASF) grants the End User use of Radiometrically Terrain Corrected (RTC) Advanced Land Observing Satellite (ALOS) PALSAR data if the End User accepts and agrees to the following ALOS PALSAR RTC End User License Agreement. The End User will be deemed to have accepted and agreed to the terms and conditions if the End User starts using ALOS PALSAR RTC data including but not limited to downloading, installing, manipulation or other action.

Section 1 Definitions

 1. “End User” means the person, legal business entity, public entity or any other legal entity who obtains the Product and is considered to have accepted this End User License Agreement. In the case of a public entity, the End User is deemed to be only the part, division, etc. of the public entity located at the address to which the Product is supplied, unless otherwise agreed upon by ASF in writing and in advance.

Value Added Product (VAP) – A modified Standard or Derivative Work Product with high-level processing that cannot be converted back to the original product. The high-level processing includes data analysis or combining multiple-satellite data, image processing based on external information, and physical quantity conversion.

 2. “Product” means any ALOS RTC satellite data product supplied by ASF.  Product is classified as Value Added Product (VAP). Definition of the product types is shown below.

 3. “JAXA” means the Japan Aerospace Exploration Agency.

 4. “METI” means the Japanese Ministry of Economy, Trade, and Industry.

 5. “Related Parties” means the parties that have been involved in the creation, production, distribution or delivery of the Product.

Section 2 Permitted Uses

These data are provided in accordance with NASA’s free and open data policy. There are no restrictions on their use.

Section 3 Prohibited Uses

1. The End User shall not delete, obscure, remove or alter any copyright notice that is contained in or appears on the Product.

Section 4 Intellectual Property Right and Copyright Notice

1. The End user confirms that NASA retains the copyright to the ALOS PALSAR RTC products, and that JAXA/METI retain the copyright to the original data from which the Product was derived.

2. The End User owns all intellectual property rights, including copyrights, which result from the End User’s act of interpretation, adaptation, authorship or any other work on the Product resulting in the creation of another VAP. All VAP products must be accompanied with the appropriate copyright notice.

3. The End User agrees that any embodiment of the Product permitted under this agreement shall contain the following copyright notice.  The copyright notice shall be prominently displayed and the [Year] field correctly filled with a numerical value corresponding to the year of raw data acquisition.

    Copyright Notice for ALOS PALSAR RTC: © NASA [Year], Includes Material © JAXA, METI [Year]

Section 5 Limited Warranty – Disclaimer

1. Neither ASF nor the Related Parties, if any, warrants that the Product is free of bugs, errors, defects or omissions.

2. The Product is provided as is with no warranty of merchantability or fitness for a particular purpose.

3. ASF and the Related Parties shall have no liability to the End User for any damage suffered by the End User or any third party, as a result of using ALOS PALSAR RTC products. This damage is including but not limited to consequential loss and lost earnings.

Section 6 Modification of this Agreement

ASF reserves the right to modify this agreement if necessary and the modified agreement will govern. In the case of modification ASF will announce on ASF internet site.

Section 7 Governing Law and Jurisdiction

This End User License Agreement shall be governed by the laws of the United States of America.