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This page shows how to use NCL to analyze EASE (Equal-Area Scalable Earth) grids (obtained from the National Snow and Ice Data Center).
ease_1.ncl: This script illustrates how to create contours of an EASE grid. The first frame is a contour plot only, and the second frame overlays the contours on a northern hemisphere polar stereographic map. Drawing the contours only is much quicker, and is good for quick debugging purposes.
In order to generate contours over a map from this kind of grid, you must set the resource trGridType to "TriangularMesh", and make sure you have the special 2D lat2d and lon2d attributes attached to the data.