How do I extract latitude and longitude information from AMSR-E sea ice data?

AMSR-E sea ice data sets are provided in the Polar Stereographic projection. NSIDC provides gridded latitude and longitude files that give the coordinates for the center of each grid cell. The latitude and longitude files are flat-binary, so the files can be opened in ENVI. There are files for each resolution of the Polar Stereographic projection: 6.25 km, 12.5 km, and 25 km.