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Earth Topics (Applications)
  • Land
  • Soil

    Vegetation

  • Snow and Ice
  • Sea Ice

    Snow and Ice

  • Natural Disasters
  • Oil Slick

  • Ocean and Coast
  • Ocean Currents and Topography

    Ocean Waves

    Coastal Geomorphology

  • Water
  • Water Management

    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
    EOLI-SA availability
    ASAR Alternating Polarisation Mode Single-Look Complex
    (ENVISAT.ASA.APS_1P)
    ENVISAT
    (1101) recent views
    Last update: 30 August 2016

    This product is a complex, slant-range, digital image generated from Level 0 data collected when the instrument is in Alternating Polarisation mode. (7 possible swaths). It contains two CO-registered images corresponding to one of the three polarisation combination submodes (HH and VV, HH and HV, VV and VH).

    In addition, the product uses the Range Doppler algorithm and the most up to date processing parameters available at the time of processing. It can be used to derive higher level products for SAR image quality assessment, calibration, and interferometric applications, if allowed by the instrument acquisition.

    A minimum number of corrections and interpolations are performed on the data in order to allow the end-user maximum freedom to derive higher level products. Complex output data is retained to avoid loss of information. Absolute calibration parameters are available depending on external calibration activities and are provided in the product annotations.

    Spatial Resolution: approximately 8m slant range x approximately 4m azimuth

    Data Set Specifications
    Spatial coverage: 90 N, 90 S, 180 W, 180 E
    Temporal coverage: 2002-11-15 - 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 news of 30 August 2016.

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

    PDF

    ASAR Products Specification - Revision C

    HTML

    Range Doppler Algorithm

    HTML

    ASA_APS_1P File Structure

    PDF

    Envisat ASAR Science and Applications

    HTML

    ASAR Level 1 Algorithms

    HTML

    ASAR Product Handbook

    PDF

    Product Quality Disclaimer

    PDF

    More ASAR Documents