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ERS-1/2 Radar Altimeter REAPER Sensor Geophysical Data Record - SGDR [ERS_ALT_2S]

Data

20 May 2021

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blue arrow DESCRIPTION

This is a RA Geophysical Data Record (GDR) product containing radar range, orbital altitude, wind speed, wave height and water vapour from the ATSR/MWR as well as geophysical corrections.

The REAPER (REprocessing of Altimeter Products for ERS) product is generated by applying a similar processing as for Envisat RA-2 on the Level 1b consolidated waveforms using 4 different re-trackers, RA calibration improvement, new precise orbit solution (POD), new ionospheric corrections (NICO09 until 1998 and GIM up to 2003), ECMWF ERA-interim model and updated SSB tables.

This product contains two data rates: a low rate of 1Hz and a high rate of 20Hz.

Most 1Hz data is also represented at 20Hz, while microwave radiometer (ATSR/MWR) data and the atmospheric and geophysical corrections are only given at 1 Hz.

The REAPER GDR (ERS_ALT_2_) is a global product including data over ocean, ice and land.

It should be noted that this product differs from the Envisat RA2 in the following ways:

  • the product format; which is NetCDF (more details can be found in the Product Handbook, and not PDS
  • the product is delivered based on orbit acquisition and not per pass (pole-to-pole)

This product is extended through Envisat RA-2 data

blue arrow DETAILS

blue arrow DATA SET SPECIFICATIONS

Spatial coverage: 

82 N, -82 S, -180 W, 180 E

Temporal coverage:

1991-08-03 - 2003-07-02

REAPER ERS-1 data is available from 3 August 1991 to 2 June 1996. REAPER ERS-2 data is available from 14 May 1995 to 2 July 2003

Date of launch:
1995-04-21, 1991-07-17
Operators:
ESA
Mission status:
completed
Orbit height:
782 to 785 km
Orbit type:
Sun-synchronous
Swath width:
5 km

blue arrow PROCESSING LEVEL

level 2,

blue arrow HOW TO ACCESS THIS DATA

Data is available online via FTP upon registration

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

Should you need support please contact EOHelp

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

ERS Reaper Activity
Product Specifications
Envisat RA Sensor Performance, Products and Algorithms
Product Information
More RA Documents
Documents
RA Software Tools
Tools
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