- Envisat ASAR AP Precision L1 [...
Envisat ASAR AP Precision L1 [ASA_APP_1P]
Envisat ASAR Alternating Polarisation Mode Precision Image
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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.
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This ASAR Alternating Polarisation Mode Precision 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
APPLICABLE TERMS & CONDITIONS
Utilisation of this data is subject to ESA's Earth Observation Terms and Conditions.
ASAR Auxiliary Data
ASAR Products Specification - Revision C
Envisat ASAR Sensor Performance, Products and Algorithms
Envisat ASAR Science and Applications
ASAR Product Handbook
ASAR Product Quality Disclaimer
ASAR Products Anomalies
More ASAR Documents
ASAR Software Tools
ESA Earth Observation User Services Portal