Minimize Dataset Details
Earth Topics (Applications)
  • Ocean and Coast
  • Ocean Currents and Topography

    Instrument type
    Date of Launch:
    1 March 2002
    Mission Status:
    Out of service since May 2012 
    Orbit Height:
    800 km 
    Orbit type:
    Swath Width:
    5 - 1150 km
    EOLI-SA availability
    ASAR Wide Swath Single Look Complex
    (1836) recent views
    Last update: 14 December 2016

    The Level-1B data product offered by ESA from the ASAR Wide-Swath Mode (WSM) 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 (see the first ASAR WSM-WSM interferogram).

    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

    Data Set Specifications
    Spatial coverage: 90 N, 90 S, 180 W, 180 E
    Temporal coverage: 2002-10-28 - 2012-04-08
    Processing level
    Level 1b
    How to access this data

    Data is available via EOLI-SA upon registration for the (A)SAR On The Fly Service.

    For information on access and use of the On-The-Fly service please refer to the OTF FAQ page and the news of 15 December 2016.

    Terms & Conditions applicable
    Utilisation of this data is subject to ESA's Earth Observation Terms and Conditions
    Auxiliary data
    ASAR auxiliary data
    Accessible via SPPA


    ASAR Products Specification - Revision C


    ASA_WSS_1P File Structure


    Envisat ASAR Science and Applications


    ASAR Level 1 Algorithms


    ASAR Product Handbook


    More ASAR Documents