ERS-1/2 Radar Altimeter REAPER METEO Product - [ERS_ALT_2M]

This is a RA Meteo product containing only the 1 Hz parameters for altimeter (surface range, satellite altitude, wind speed and significant wave height at nadir) and ATSR/MWR data (brightness temperature at 23.8 GHz and 36.5 GHz, water vapour content, liquid water content) used to correct altimeter measurements. It also contains the full geophysical corrections.

This product corresponds to a subset of the REAPER GDR product (ERS_ALT_2_).

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 only the low rate of 1Hz data.

The REAPER Meteo (ERS_ALT_2M) 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