Envisat ASAR AP Medium Resolution L1 [ASA_APM_1P]

Envisat ASAR Alternating Polarisation Medium Resolution Image

How to Access Data

Users can freely access the collection using the below link and will be requested to log in (new users shall register) to ESA EO Sign In to download the products.

ESA internal users can use their ESAAD account.

The products are available for download via the ESA ERS and Envisat (A)SAR dedicated Online Dissemination Service

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.

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

For further information about the EO Sign In Service you can visit TellUS

Should you need support please contact EOHelp



This ASAR Alternating Polarization Medium Resolution Image product has been generated from Level 0 data collected when the instrument was in Alternating Polarisation Mode. The product has lower geometric resolution but higher radiometric resolution than ASA_APP and contains one or two co-registered images corresponding to one of the three polarisation combination sub modes (HH and VV, HH and HV, VV and VH)..

This product has been processed using the SPECAN algorithm and contains radiometric resolution good enough for ice applications and covers a continuous area along the imaging swath.

The ASAR AP L0 full mission data archive has been bulk processed to Level 1 (ASA_APM_1P) in Envisat format with the IPF-ASAR processor version 6.03.

Spatial Resolution: 150 m ground range x 150 m azimuth.



Digital Object Identifier (DOI): European Space Agency, 2021, Envisat ASAR Alternating Polarization Medium Resolution L1 Product. IPF version 6.03.0 https://doi.org/10.5270/EN1-x542no0

Spatial coverage: 
90 N, -90 S, -180 W, 180 E
Temporal coverage:
2002-11-15 - 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



ASAR auxiliary data
Auxiliary Data
ASAR Products Specification - Revision C
Product Specifications
Envisat ASAR Sensor Performance, Products and Algorithms
Product Information
Envisat ASAR Science and Applications
Technical Note
ASAR Product Handbook
User Manual
ASAR Product Quality Disclaimer
ASAR Products Anomalies
More ASAR Documents
Product Specifications
ASAR Software Tools
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