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

    Instrument type
    Instrument
    Mission
    Operators:
    ESA
    Date of Launch:
    1 March 2002
    Mission Status:
    Out of service since May 2012 
    Orbit Height:
    800 km 
    Orbit type:
    Sun-synchronous 
    Swath Width:
    5 - 1150 km
    ASAR Wide Swath Single Look Complex
    (ENVISAT.ASA.WSS_1P)
    ENVISAT
    (2925) 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 online 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
    Resources

    PDF

    ASAR Products Specification - Revision C

    HTML

    ASA_WSS_1P File Structure

    PDF

    Envisat ASAR Science and Applications

    HTML

    ASAR Level 1 Algorithms

    HTML

    ASAR Product Handbook

    PDF

    More ASAR Documents