Discrete global grid
http://dbpedia.org/resource/Discrete_global_grid
El DGGS (Discrete Global Grid System) o Sistema de Mallas Globales y Discretas es un estándar desarrollado por el OGC cuyo objetivo es mejorar la manera en la que se georreferencia datos geográficos sin tener que manejar sistemas de coordenadas proyectadas. La norma tesela la Tierra en una secuencia jerarquizada y piramidal de hexágonos de igual superficie que cubren toda la superficie esférica con una resolución creciente.
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A discrete global grid (DGG) is a mosaic that covers the entire Earth's surface.Mathematically it is a space partitioning: it consists of a set of non-empty regions that form a partition of the Earth's surface. In a usual grid-modeling strategy, to simplify position calculations, each region is represented by a point, abstracting the grid as a set of region-points. Each region or region-point in the grid is called a cell. In the context of a spatial index, a DGG can assign unique identifiers to each grid cell, using it for spatial indexing purposes, in geodatabases or for geocoding.
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Sistema de Mallas Globales y Discretas
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Discrete global grid
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43791967
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1118101296
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rectangular
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equal-angle
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parametrized
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polygonal strips
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quadrilateral projections
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spherical equilateres
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uniform area-preserved
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uniform spheroidal shape
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2006-12-15
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irregular
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rectangular
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quadrilateral
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semi-regular
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triangular
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triangular non-uniform
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1983
2004
2006
2008
2015
1940.0
1950.0
1970.0
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Delaunay-Triangulation.svg
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Four-level_Z.svg
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Geographic coordinates sphere.png
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HTM-diagram.png
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HealpixGridRefinement.jpg
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Hilbert Cubed Sphere.png
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Utm-zones-USA.svg
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Utmzonenugitterp.png
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A discrete global grid (DGG) is a mosaic that covers the entire Earth's surface.Mathematically it is a space partitioning: it consists of a set of non-empty regions that form a partition of the Earth's surface. In a usual grid-modeling strategy, to simplify position calculations, each region is represented by a point, abstracting the grid as a set of region-points. Each region or region-point in the grid is called a cell. When each cell of a grid is subject to a recursive partition, resulting in a "series of discrete global grids with progressively finer resolution", forming a hierarchical grid, it is called a hierarchical DGG (sometimes "global hierarchical tessellation"or "DGG system"). Discrete global grids are used as the geometric basis for the building of geospatial data structures. Each cell is related with data objects or values, or (in the hierarchical case) may be associated with other cells. DGGs have been proposed for use in a wide range of geospatial applications, including vector and raster location representation, data fusion, and spatial databases. The most usual grids are for horizontal position representation, using a standard datum, like WGS84. In this context, it is common also to use a specific DGG as foundation for geocoding standardization. In the context of a spatial index, a DGG can assign unique identifiers to each grid cell, using it for spatial indexing purposes, in geodatabases or for geocoding.
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El DGGS (Discrete Global Grid System) o Sistema de Mallas Globales y Discretas es un estándar desarrollado por el OGC cuyo objetivo es mejorar la manera en la que se georreferencia datos geográficos sin tener que manejar sistemas de coordenadas proyectadas. La norma tesela la Tierra en una secuencia jerarquizada y piramidal de hexágonos de igual superficie que cubren toda la superficie esférica con una resolución creciente.
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fine
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coarse
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140
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terrain
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cube
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Geoid
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cylinder
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none
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UTM
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UTM or latlong
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parametrized HEALPix projection
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spherical projections in each cube face using quadratic function
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43424
