page_title: Geodesic grid
section_title: Construction
hierarchical_section_title: Geodesic grid / Construction
caption_attribution_description: English: The combination of grid illustration, volume rendering of vorticity (yellow tubes) and temperature (north cap). Note that for the purpose of clear illustration in the right image, the grid is coarser than the actual one used to generate the vorticity and temperature
context_page_description: A geodesic grid is a spatial grid based on a geodesic polyhedron or Goldberg polyhedron.
context_section_description: A geodesic grid is a global Earth reference that uses triangular tiles based on the subdivision of a polyhedron (usually the icosahedron, and usually a Class I subdivision) to subdivide the surface of the Earth. Such a grid does not have a straightforward relationship to latitude and longitude, but conforms to many of the main criteria for a statistically valid discrete global grid. Primarily, the cells' area and shape are generally similar, especially near the poles where many other spatial grids have singularities or heavy distortion. The popular Quaternary Triangular Mesh (QTM) falls into this category.
  Geodesic grids may use the dual polyhedron of the geodesic polyhedron, which is the Goldberg polyhedron. Goldberg polyhedra are made up of hexagons and (if based on the icosahedron) 12 pentagons. One implementation that uses an icosahedron as the base polyhedron, hexagonal cells, and the Snyder equal-area projection is known as the Icosahedron Snyder Equal Area (ISEA) grid.
caption: Volume rendering of Geodesic grid[1] applied in atmosphere simulation using Global Cloud Resolving Model (GCRM)[2]. The combination of grid illustration and volume rendering of vorticity (yellow tubes) . Note that for the purpose of clear illustration in the image, the grid is coarser than the actual one used to generate the vorticity.
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