What is the grid used ?

For the products up to version 2.6.x (before 31/12/2013),we are using the EASE-Grid Global (known as EPSG:3410), defined in 1992, and based on the international 1924 authalic sphere. A complete description can be found at : http://nsidc.org/data/ease/ease_grid.html

For the 2.7 products (after 01/01/2014), we are using the EASE-Grid 2.0 (EPSG 3975). A complete description can be found at : http://nsidc.org/data/ease/ease_grid2.html

Differences between the two grids are described at : http://nsidc.org/data/ease/versions.html