Data Access

All data can be found in the data archive, which is accessible via FTP and HTTP.

For FTP access, connect to The products are available in the directory "MultiYearIce". Please set your ftp client to "active mode". Otherwise no connection is possible. The user name is "anonymous" and no password is needed.

  • amrse-ascat/final/ contains data from 2009 to 2011
  • amsr2-ascat/final/  contains data fom 2012 to 2017

For HTTP access, visit, the structure is the same as for FTP.

Data Format

Multiyear ice maps are available as PNG image, and the underlying data are available as NetCDF files

There is one file per day. Each NetCDF file contains a two-dimensional array 'MYI' of the MYI concentration in a polar stereographic grid, and another array 'CR_FLAG' that shows which correction scheme was applied to which pixel. Information about the projection (EPSG and Proj.4) is contained in the global attributes. In addition, the longitude and latitude coordinates of each pixel in the NetCDF files can be found in an extra file  (see also the README file


For citing the individual datasets please have a look at the citation section, which can be found at the bottom of all dataset pages.