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

Data

31 Oct 2019

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blue arrow DESCRIPTION

This is a RA Sensor Geophysical Data Record (SDGR) product containing all of the parameters found in the REAPER GDR product (ERS_ALT_2_) with the addition of the echo waveform and selected parameters from the Level 1b data.

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 SGDR (ERS_ALT_2S) 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 1996REAPER 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
Resolution:

blue arrow PROCESSING LEVEL

level 2,

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

Documentation on the ERS REAPER reprocessing
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