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  • Envisat ASAR AP Single-Look Co...

Envisat ASAR AP Single-Look Complex L1 [ASA_APS_1P]

Envisat ASAR Alternating Polarisation Mode Single-Look Complex

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  • How to Access Data
  • Available to Residents of the Following Countries
  • Collection Description
  • Technical Details
  • Having Problems Accessing Data?
  • Resources
  • Discover Latest Data

How to Access Data

EO Sign In Authentication (Open): This collection is openly accessible but requires users to log in with an EO Sign In account (a system used across ESA Earth Observation services) before any downloads can proceed.

Access Steps:

  1. Create or log in to EO Sign In account
  2. Go to the ESA Online Dissemination Service
  3. Browse or search for the collection
  4. Download product
Read More

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.

The data is collection based and allows data browse and download through the treeview as well as via geographical catalogue search based on area of interest and metadata. Interferometric search option is available for relevant collections. Data download is available via HTTPS, including bulk download functionality. ESA internal users can use their ESAAD account.

For information on the (A)SAR On-The-Fly service please refer to the OTF User Manual.

Available to Residents of the Following Countries

World Wide

Collection Description

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 8 m slant range x approximately 4 m azimuth.

Technical Details

DATA SET SPECIFICATIONS

Spatial coverage:
90 N, 90 S, 180 W, 180 E
Temporal coverage:
2002-11-15 - 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
Resolution:
High Resolution - HR (5 - 20 m)

PROCESSING LEVEL

level 1b

APPLICABLE TERMS & CONDITIONS

Utilisation of this data is subject to ESA's Earth Observation Terms and Conditions
READ T&C

Having Problems Accessing Data?

How to access data advertised by an ESA Announcement of Opportunity

This guide sets out how to request access to Earth observation data promoted through an ESA Announcement of Opportunity (AO).

How to access Earth observation data distributed by ESA - Fast Registration

Researchers can quickly obtain datasets from ESA’s Third Party Missions and Heritage Missions on a free basis, by using the Fast Registration mechanism.

How do I access the ERS and Envisat (A)SAR data services?

Access ERS and Envisat (A)SAR data via the ESA Online Dissemination Service.

SEE FULL FAQ

Resources

Auxiliary Data

ASAR auxiliary data

Auxiliary Data

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Product Specifications

ASAR Products Specification - Revision C

Product Specifications

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Product Information

Envisat ASAR Sensor Performance, Products and Algorithms

Product Information

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Technical Note

Envisat ASAR Science and Applications

Technical Note

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User Manual

ASAR Product Handbook

User Manual

Download
Product Specifications

More ASAR Documents

Product Specifications

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Tools

ASAR Software Tools

Tools

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Software Tools

ENVISAT Software tools

Software Tools

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ESA Earth Observation User Services Portal

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ESA Earth Observation User Services Portal

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