The project ERS/Envisat MWR  Recalibration and Water  Vapour Thematic Data Record Generation (EMiR) has been funded by the European Space Agency (ESA) as part of its Long Term Data Preservation (LTDP) activities. While LDTP EMiR lasted from November 2013 until October 2016, this website is continued to inform about developments after the official end of the project.

LDTP EMiR had the following objectives:

  • To generate a fundamental data record (FDR) of top-of-atmosphere brightness temperatures from the MWR series of instruments flown of the platforms ERS-1, ERS-2, and Envisat.
  • To generate a thematic data record (TDR) of the total column water vapour (TCWV) above the world’s oceans covering the period from 10/1992 to 04/2012, independent of other satellite-based TCWV data records, which are often based on SSM/I observations.
  • To compare the newly derived TCWV TDR with other long term data sets on TCWV through the GEWEX  water vapour assessment  (GVAP).
  • To assess the impact of an improved TCWV information on the accuracy of ocean altimetry, which relies on accurate knowledge of atmospheric water vapour  to achieve the required precision.
  • To provide guidance for the MWR instruments flown onboard the Sentinel-3 series of satellites.

This website provides background information on the LDTP EMiR project and gives access to all relevant project results.

[Last edited: 2017-02-20]