The team selected a cylindrical projection for global studies, and separate equal-area azimuthal projections for the Northern and Southern Hemispheres to support polar research. The SSM/I team decided in favor of equal-area projections for the EASE-Grids because they minimize distortion over the globe. The EASE-Grid provides a versatile framework because the technique used to interpolate swath data to the fixed Earth grid is unique to each sensor, allowing for an infinite number of grid definitions, all within a common image-processing format. The prototype, originally specific to SSM/I data, is now called the Equal-Area Scalable Earth Grid (EASE-Grid) because of its wide potential for application to any global-scale data set. The need prompted Armstrong's SSM/I Pathfinder team to develop a prototype mapping and gridding system in collaboration with researchers based at the University of Michigan's Radiation Laboratory. EASE-Grid north azimuthal equal-area map (Image courtesy of the National Snow and Ice Data Center).
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