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  • News (10)
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  • Events (9)
  • Tools (3)
  • Activities (3)
  • Documents (1199)
  • News - Thematic area articles

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    Transforming space data into climate action

    ESA’s Earth observation activities are playing a key role in the revitalised global drive to combat climate change.

  • Document - Technical Note

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    The RA-2 On-Board Tracker and its Autonomous Adaptable Resolution

    This technical note describes the complete functionality of the RA-2 on-board Tracker and how its Resolution Selection Logic (RSL) works. It gives a detailed analysis of the algorithm and its configuration parameters.

  • Document - General Reference

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    The Envisat Radar Altimeter System (RA-2)

    This article was published in the ESA Bulletin Nr. 98 and givesdetails on RA-2 and on its role in the ENVISAT mission.

  • Document - General Reference

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    Taking-the-Measure-of-Earth-Fifteen-Years-of-Progress-in-Radar-Altimetry.pdf

    This article is extracted from ESA Bulletin Nr. 128.

  • Data - EO Sign In Authentication (Open)

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    Sea Ice Thematic Data Product [ALT_TDP_SI]

    This is the Sea Ice Thematic Data Product (TDP) V1 resulting from the ESA FDR4ALT project and containing the sea ice related geophysical parameters, along with associated uncertainties: snow depth, radar and sea-ice freeboard, sea ice thickness and concentration. The collection covers data for the ERS-1, ERS-2 and Envisat missions, and bases on Level 1 data coming from previous reprocessing (ERS REAPER and the Envisat V3.0) but taking into account the improvements made at Level 0/Level 1 in the frame of FDR4ALT (ALT FDR). The Sea Ice TDP provides data from the northern or southern hemisphere in two files corresponding to the Arctic and Antarctic regions respectively for the winter periods only, i.e., October to June for the Arctic, and May to November for the Antarctic. For many aspects, the Sea Ice TDP is very innovative: First time series of sea-ice thickness estimates for ERS Homogeneous calibration, allowing the first Arctic radar freeboard time series from ERS-1 (1991) to CryoSat-2 (2021) Uncertainties estimated along-track with a bottom-up approach based on dominant sources ERS pulse blurring error corrected using literature procedure [Peacock, 2004] The FDR4ALT products are available in NetCDF format. Free standard tools for reading NetCDF data can be used. Information for expert altimetry users is also available in a dedicated NetCDF group within the products. Please consult the FDR4ALT Product User Guide before using the data. The FDR4ALT datasets represent the new reference data for the ERS/Envisat altimetry missions, superseding any previous mission data. Users are strongly encouraged to make use of these datasets for optimal results.

  • Document - Conference Presentation - Poster

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    Remaining-East-West-bias-explained.pdf

    This presentation shows the results obtained from a scientific assessment on the use of GDR-D improved orbit standard and of the consequent improvement in the Sea Surface Height and Sea Level Anomaly Data of altimeter GDR data (A. Ollivier, OSTST 2011).

  • Document - Publication - Paper

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    RA-2-S-Band-anomaly-detection-and-waveforms-reconstruction.pdf

    This paper describes the algorithm developed for the L1b processor that allows to set a flag identifying the data affected by the S-Band anomaly and reconstruct normal echo waveforms.

  • Document - Product Cal/Val Plan/Report

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    RA-2-In-Flight-Instrument-Calibration-and-Level-1b-Verification-Plan.pdf

    This document describes the plan for the RA-2 In-flight Instrument Calibration and Level lb Verification procedures.

  • Document - Technical Note

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    RA-2 S-Band Anomaly Investigation

  • Document - Technical Note

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    RA-2 data Rain Flag

  • Document - Technical Note

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    RA-2 Anomaly of 01-02-2006

  • Document - Proceedings

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    PolInSAR-2007-Proceedings-of-the-3rd-International-Workshop-on-Science-and-Applications-of-SAR-Polarimetry-and-Polarimetric-Interferometry.pdf

    Proceedings of PolInSAR 2007 held in Frascati, Italy on from 22-26 January 2007.

  • Document - Product Specifications

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    PH_light_2rev0_ESA.pdf

    RA-2 and MWR product information

  • Document - Product Cal/Val Plan/Report

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    Passive Calibration of the Backscattering Coefficient of the Envisat RA-2

    Passive Calibration of Backscattering Coefficient of Envisat RA-2: final report

  • Document - Publication - Paper

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    OPERATIONAL-CORRECTION-FOR-THE-RA2-SIDE-A-USO-ANOMALY.pdf

    This paper presents the method implemented to correct the anomalous data as well as the assessment of the quality and performance of the corrected data through two different analyses.

  • Data - EO Sign In Authentication (Open)

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    Ocean Waves Thematic Data Product [ALT_TDP_WA]

    This is the Ocean Waves Thematic Data Product (TDP) V1 resulting from the ESA FDR4ALT project and containing Significant Wave Height estimates for the ERS-1, ERS-2 and Envisat missions. Compared to existing datasets, the Ocean Waves TDP demonstrates notable improvements in several aspects: Great improvements for Envisat due to noise reduction from Adaptive retracker and High-Frequency Adjustment (HFA) All variables are given at 5 Hz The FDR4ALT products are available in NetCDF format. Free standard tools for reading NetCDF data can be used. Information for expert altimetry users is also available in a dedicated NetCDF group within the products. Please consult the FDR4ALT Product User Guide before using the data. The FDR4ALT datasets represent the new reference data for the ERS/Envisat altimetry missions, superseding any previous mission data. Users are strongly encouraged to make use of these datasets for optimal results.

  • Data - EO Sign In Authentication (Open)

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    Ocean and Coastal Topography Thematic Data Product [ALT_TDP_OC]

    This is the Ocean and Coastal Topography Thematic Data Product (TDP) V1 resulting from the ESA FDR4ALT project and containing improved sea surface height anomaly data records both at 1 Hz and 20 Hz resolution to address climate and/or coastal areas studies. The collection covers data for the ERS-1, ERS-2 and Envisat missions. Note that a dedicated processing to coastal zones has been applied for coastal distances below 200 km. Compared to existing datasets, the Ocean and Coastal Topography TDP demonstrates notable improvements in several aspects: Up-to-date orbit and geophysical corrections applied Adaptive retracker for Envisat The FDR4ALT products are available in NetCDF format. Free standard tools for reading NetCDF data can be used. Information for expert altimetry users is also available in a dedicated NetCDF group within the products. Please consult the FDR4ALT Product User Guide before using the data. The FDR4ALT datasets represent the new reference data for the ERS/Envisat altimetry missions, superseding any previous mission data. Users are strongly encouraged to make use of these datasets for optimal results.

  • Document - General Reference

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    Monitoring-River-and-Lake-Levels-from-Space.pdf

    This article was published in the ESA Bulletin Nr. 117 and describes the new global river and lake monitoring products developed by ESA with the help of De Monfort University (UK).

  • Document - General Reference

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    Monitoring-Marine-Life-from-Space-Envisat-Experience-in-Chile.pdf

    This article was published in the ESA Bulletin Nr. 126 and describes the use of satellite data for monitoring the environmental conditions of coastal waters and the health of southern oceans.