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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. The green dots show the Gauss-Lobatto points. CAM-SE is "collocated", meaning that all variables (U,V,T, etc...) are carried around on the green dots. CAM physics is computed in columns located at all the green points. Each column has a Gauss-Lobatto weight associated with it, which is also that columns area. The sum of these weights is 4pi (the area of the unit sphere). Note that the Gauss-Lobatto points are not quite equally spaced - they cluster at the edges of the spectral elements.
SE "subcell" grid
Most analysis tools and other tools can not handle higher order elements such as used in CAM-SE. For these codes, we produce metadata that will divide each spectral element into a subcell. This subcell grid is shown below. Note that the Gauss-Lobatto points are the verticies of this grid.
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