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Envisat ASAR WS Single Look Complex L1 [ASA_WSS_1P]

Envisat ASAR Wide Swath Single Look Complex

Data

28 Nov 2019

DOWNLOAD DATA Data is available on EOCAT.

blue arrow DESCRIPTION

The Level-1B data product offered by ESA from the ASAR Wide-Swath Mode (WS) 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.

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

blue arrow DETAILS

blue arrow DATA SET SPECIFICATIONS

Spatial coverage: 

90 N, -90 S, -180 W, 180 E

Temporal coverage:

2002-10-28 - 2012-04-08

Date of launch:
2002-03-01
Operators:
ESA
Mission status:
completed
Orbit height:
800 km
Orbit type:
Sun-synchronous
Swath width:
5 - 1150 km

blue arrow PROCESSING LEVEL

level 1b,

blue arrow HOW TO ACCESS THIS DATA

Users can freely access the collection using the below links and will be requested to log in (new users must first register an account) to ESA EO Sign In to download the products.

ESA internal users can use their ESAAD account.

Data is available on EOCAT
Data is available on the ESA Online Dissemination System upon registration

blue arrow APPLICABLE TERMS & CONDITIONS

Utilisation of this data is subject to ESA's Earth Observation Terms and Conditions

READ T&C

blue arrow RESOURCES

ASAR auxiliary data
Auxiliary Data
ASAR Products Specification - Revision C
Product Specifications
Envisat ASAR Sensor Performance, Products and Algorithms
Product Information
ASA_WSS_1P File Structure
Product Specifications
Envisat ASAR Science and Applications
Technical Note
ASAR Product Handbook
User Manual
ASAR Level 1 Algorithms
Product Specifications
First ASAR WSM-WSM interferogram
News
ASAR Product Quality Disclaimer
ASAR Products Anomalies
More ASAR Documents
Product Specifications
ASAR Software Tools
Tools
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