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Data files for some examples
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.
ease_2.ncl:
This plots discrete (categorical) snow extent data for Dec 25-31, 2012 rendered on a 100km resolution EASE grid.
The numbers pertain to the following categories:
10: Snow cover reported by weekly_cdr, passive_microwave, 11: Snow cover reported by weekly_cdr only, 12: Snow cover reported by passive_microwave only, 20: Snow free land, 30: Permanent ice covered land, 40: Ocean.
Example pages containing:
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NCL Graphics: EASE Grids
![](./Images/ease_1_2_lg.png)
This page shows how to use NCL to analyze EASE (Equal-Area Scalable
Earth) grids (obtained from the National
Snow and Ice Data Center).
![](Images/ease_1_1_sm.png)
![](Images/ease_1_2_sm.png)
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.
![](Images/ease_2_sm.png)
The trick of using 'cnLevels' one greater than the actual values was neeeded to get the figure.
Note: An example which shows labels on the plot is at the classification/categorical location.