ERS-1/2 Radar Altimeter REAPER Geophysical Data Record - GDR [ERS_ALT_2]

Data

18 Nov 2019

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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 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
Product Specifications
More RA Documents
Product Specifications
RA Software Tools
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