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Eagle, Globe, and Anchor. Date: 1995: Source: Derived from Image:US-MarineCorps-Emblem.svg: Author: Derived by User:Flamurai from work by the U.S. Government: Permission (Reusing this file) Public domain from a copyright standpoint, but other restrictions apply.
The "globe", in the DGG concept, has no strict semantics, but in geodesy a so-called "grid reference system" is a grid that divides space with precise positions relative to a datum, that is an approximated a "standard model of the Geoid". So, in the role of Geoid, the "globe" covered by a DGG can be any of the following objects:
This work has been released into the public domain by its author, UweSch.This applies worldwide. In some countries this may not be legally possible; if so: UweSch grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
A grid-based spatial index has the advantage that the structure of the index can be created first, and data added on an ongoing basis without requiring any change to the index structure; indeed, if a common grid is used by disparate data collecting and indexing activities, such indices can easily be merged from a variety of sources.
The World Geographic Reference System (GEOREF) is a geocode, a grid-based method of specifying locations on the surface of the Earth.GEOREF is essentially based on the geographic system of latitude and longitude, but using a simpler and more flexible notation.
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Openclipart, also called Open Clip Art Library, is an online media repository of free-content vector clip art.The project hosts over 160,000 free graphics and has billed itself as "the largest community of artists making the best free original clipart for you to use for absolutely any reason".
where is the longitude from the central meridian (in radians), is the latitude, and R is the radius of the globe used as the model of the earth for projection. Hence the sphere is mapped onto the vertical cylinder, and the cylinder is stretched to double its length.