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Envisat ASAR IM Precision L1 [ASA_IMP_1P]

Envisat ASAR Image Mode Precision Image

How To Access Data

EO Sign In Authentication (Open)

  1. Go to the Dissemination Service
  2. Find the product you want via a map using the catalogue search
  3. Register or log in to EO Sign In
  4. Download.
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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.

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. Data download is available via HTTPS, including bulk download functionality. ESA internal users can use their ESAAD account.

Envisat products can also be discovered through ESA's EO Catalogue (EO CAT), which allows users to browse and download products among the available datasets from ESA and Third Party Missions and instruments, using various criteria (Spatial, temporal).

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

New users can register an account on EO Sign In. For further information about the EO Sign In Service you can visit TellUs

Should you need support to access the data, please contact EOHelp.


This is a multi-look, ground range, digital Precision Image generated from Level 0 data collected when the instrument was in Image Mode (7 possible swaths HH or VV polarisation). The product includes slant range to ground range correction. It is for users wishing to perform applications-oriented analysis and applies to multi-temporal imaging and to derive backscattering coefficients.

The stand-alone image is generated using the Range/Doppler algorithm. The processing uses up to date (at time of processing) auxiliary parameters corrected for antenna elevation gain, and range spreading loss. Engineering corrections and relative calibration are applied to compensate for well-understood sources of system variability. Absolute calibration parameters, when available (depending on external calibration activities) are provided in the product annotations.

This product provides a continuation of the ERS-SAR_PRI product.

Spatial Resolution: 30 m ground range x 30 m azimuth.



Spatial coverage:
90 N, -90 S, -180 W, 180 E
Temporal coverage:
2002-10-18 - 2012-04-08
Date of launch:
Mission status:
Orbit height:
800 km
Orbit type:
Swath width:
5 - 1150 km


Level 1b


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



Auxiliary Data

ASAR Auxiliary Data

Auxiliary Data

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Product Specifications

ASAR Products Specification - Revision C

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Product Information

Envisat ASAR Sensor Performance, Products and Algorithms

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Technical Note

Envisat ASAR Science and Applications

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User Manual

ASAR Product Handbook

User Manual

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More ASAR Documents

Product Specifications

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ASAR 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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