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The Polar Gridded AVHRR Brightness Temperatures data set uses the same projection and grid as that used by NSIDC for the Arctic SSM/I data. The north polar SSM/I grid is aligned with the 135 degrees west 45 degrees east meridian. The Pacific and European Grids Map shows the two grids used to match this grid alignment.
Both maps are adapted from:
Fetterer et al. 1993. Data set of Arctic AVHRR imagery for the study of leads. Annals of Glaciology. 17:398-404.