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  • Land
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    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 Precision Image
    (ENVISAT.ASA.APP_1P)
    ENVISAT
    (150) recent views
    Last update: 30 August 2016

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

    This is a stand-alone multi-look, ground range, narrow swath digital image generated using the SPECAN algorithm and the most up to date auxiliary information available at the time of processing. Engineering corrections and relative calibration (antenna elevation gain, range spreading loss) are applied to compensate for well-understood sources of system variability.

    Generation of this product uses a technique to allow half the looks of an image to be acquired in horizontal polarisation and the other half in vertical polarisation and processed to 30-m resolution (with the exception of IS1). Absolute calibration parameters are available depending on external calibration activities and are provided in the product annotations.

    Spatial Resolution: 30 m ground range x 30 m 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

    SPECAN Algorithm

    HTML

    ASA_APP_1P File Structure

    PDF

    Envisat ASAR Science and Applications

    HTML

    ASAR Level 1 Algorithms

    HTML

    ASAR Product Handbook

    PDF

    More ASAR Documents