page_title: Geodesic grid
section_title: Construction
hierarchical_section_title: Geodesic grid / Construction
caption_attribution_description: English: en:Conway polyhedron notation, [1]
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: A highly divided Goldberg polyhedron: the dual of the above image.
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