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Here is a low-resolution CAM-SE grid. This is a "ne4np4" grid, meaning that it has 4x4 spectral elements in each cube face (the "ne" value), and each spectral element has a grid of 4x4 (the "np" value) Gauss-Lobatto points inside it. The blue lines show the edges of the spectral elements. CAM-SE is collocated, meaning that all variables (U,V,T, etc...) are carried around on the GLL nodes. CAM physics is computed in columns at GLL nodes. Each column has a Gauss-Lobatto weight associated with it, which is also that columns areacan also be interpreted as an area associated with each node. The sum of these weights is 4pi (the area of the unit sphere). One can see from the figure that GLL nodes are not quite equally spaced - they cluster at the edges of the spectral elements.
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