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The two grids are based on different map projections. The polar stereographic projection was initially used with ice concentration products developed at the NASA Goddard Space Flight Center (GSFC) and has been retained for historical consistency. It specifies a projection plane tangent to the earth ...

Hi Ippolita, The HDF EOS Tools and Information Center has a webpage with example code for various NSIDC data sets - http://hdfeos.org/zoo/index_openNSIDC_Examples.php#MODIS. This webpage also contains some more generic example code for using HDF in MATLAB - https://www.hdfeos.org/examples/index.php....