Envisat ASAR WS Single Look Complex L1 [ASA_WSS_1P]

Envisat ASAR Wide Swath Single Look Complex

How to Access Data

Users can freely access the collection using the below links and will be requested to login (new users shall register) to ESA EO Sign In to download the products. ESA internal users can use their ESAAD account. The products are available for download via the following interfaces:

ESA EO Multimission Catalogue (EO CAT) - Allows users to discover and search products among the available datasets from ESA and Third Party Missions and instruments, using various criteria (spatial, temporal, specific).

ESA ERS and Envisat (A)SAR dedicated Online Dissemination Service - The ESA (A)SAR On-the-fly (OTF) data processing and dissemination service allows end-users to gain direct access to the (A)SAR archive from the ERS-1, ERS-2 and Envisat Missions. The data is collection based and allows data browse and download through the treeview as well as via geographical catalogue search based on area of interest and metadata. Interferometric search option is available for relevant collections. Data download is available via HTTPS, including bulk download functionality.

For information on the (A)SAR On-The-Fly service please refer to the OTF FAQ page

For further information about the EO Sign In Service visit TellUS

Should you need support please contact EOHelp



The Level-1B data product offered by ESA from the ASAR Wide-Swath Mode (WS) is the multi-look detected product (ASA_WSM_1P), intended to support applications that exploit intensity data.

In order to support the development of new applications with the ASAR ScanSAR data, a WSM product providing phase information has been developed and implemented in the ESA ASAR processor, the Wide-Swath Single-Look complex product (ASA_WSS_1P). This product is mainly used for INSAR applications based either on wide-swath/wide-swath pairs or wide-swath/image mode pairs, applications of ocean current mapping, large-area ocean wave retrievals, and atmospheric water vapour characterisation.

It shall be mentioned that the standard ESA WSS product is based on the prototype WSS processor developed by Polimi/Poliba, which has also been used to generate prototype products for testing the potential and preparing the exploitation of the WSS product.

The ESA ASA_WSS_1P product is available as a standard Envisat ASAR product.

The ASA_WSS_1P product format is slightly different from other ASAR products since:

  • there are 5 different MDSs, one per sub-swath
  • a "Doppler Grid" ADS has been included to support ocean current mapping applications
  • there are 5 records in the MPP ADS, one per sub-swath
  • there are 5 records in the SQ ADS, one per sub-swath

Other key characteristics of the ASA_WSS_1P product are summarised below:

  • processing is fully phase preserving
  • data in the MDSs is sampled in a common grid both in range and in azimuth
  • standard product is 60 sec long with 80 m az. pixel spacing
  • auxiliary timeline information has been added in the Main Processing Parameters ADS
  • elevation antenna pattern correction is applied by default (although the product is a single-look complex)

Spatial Resolution: approximately 8 m slant range x 80 m azimuth



Spatial coverage: 
90 N, -90 S, -180 W, 180 E
Temporal coverage:
2002-10-28 - 2012-04-08
Date of launch:
Mission status:
Orbit height:
800 km
Orbit type:
Swath width:
5 - 1150 km


level 1b


Utilisation of this data is subject to ESA's Earth Observation Terms and Conditions



ASAR auxiliary data
Auxiliary Data
ASAR Products Specification - Revision C
Product Specifications
Envisat ASAR Sensor Performance, Products and Algorithms
Product Information
Envisat ASAR Science and Applications
Technical Note
ASAR Product Handbook
User Manual
More ASAR Documents
Product Specifications
ASAR Software Tools
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