Most of these conformant DGGS were introduced and investigated in the two decades 1980-2000. There is a wide collection of tessellations that meet the criteria of a DGGS. In addition, the Google Maps tiling scheme is not global as it does not cover areas with latitude greater than 85.0511 degrees. This tessellation partitions each tile into 256×256 equal area square cells, however, these cells also fail to correspond to equal-sized areas on the Earth’s surface. Another widely used tessellation is the tiling system introduced by Google on top of the Web Mercator projection of the Earth. However, it generates cells with variable shape and size at each resolution level and violates one of the criteria of DGGS.
The resulting grid is very convenient and offers a straightforward definition.
The most widely used tessellation of the Earth’s surface is based on the geographic coordinate system with cells defined by arcs of equal-angle increments of latitude and longitude, e.g., 10 ox10 o, 1 ox1 o, 6’圆’, etc. A tessellation of cells must meet a set of criteria to be considered as a DGGS, including : global coverage, equal area cells, single point representation per cell, and multiple levels of granularity. tessellation) of the Earth’s surface does necessarily result into a DGGS. It is important to make clear that not any partition (a.k.a. A Discrete Global Grid System (DGGS) is a series of discrete global grids a discrete hierarchical tessellation of progressively finer resolution cells. cells) containing a single point and meeting the needs for global sampling, storage, modeling, processing, analysis, discovery, integration, and visualization.
In other words, on January 5 th OGC requested public comment on the OGC candidate Discrete Global Grid Systems (DGGS) Core Standard.Ī Discrete Global Grid (DGG) is a partition of the Earth’s surface into a set of regions (a.k.a. The beginning of 2016 was accompanied with a sonorous press release from the Open Geospatial Consortium (OGC) entitled: “OGC® seeks public comment on a candidate standard that may replace legacy coordinate systems”. Discrete Global Grid Systems – A new OGC standard emerges.
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