By Geoffrey H. Dutton
While spatial facts is digitized to be used in geographic info platforms and different software program, information regarding its unique scale, answer and accuracy is often misplaced. for that reason, utilizing such details at various scales and mixing it with information from different resources should be tough. Mapping vector information at smaller than the unique scale calls for its generalization, that's often dealt with by way of post-processing in ways in which are just weakly supported via databases. The types and strategies defined during this publication conquer many such difficulties via delivering a multi-resolution info illustration that enables retrieval of map facts at a hierarchy of scales, in addition to documenting the accuracy of each spatial coordinate.
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Extra info for A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences)
Tao Te Ching As we have seen, there is more than one way to model planets as polyhedra and more than one way to carve up any of these. In general, the models under discussion here start with a platonic solid. Besides octahedra (having 8 facets), we have seen examples of dodecahedra (12), icosahedra (20) and truncated icosahedra (32, itself a polyhedral subdivision). 4 illustrates have been proposed but will not be dealt with here. To our knowledge, no one has suggested using the simplest polyhedron - - a tetrahedron (4 facets) - - as the basis for a global spatial data model.
The discussion concludes with descriptions of data models that have been derived from QTM and related sources. 1 Polyhedral Map Projections Mapmakers and others have modeled the earth as a polyhedron for many years, going back to at least the time of the German artist Albrecht Diirer (14711528), whose drawings of polyhedral globes appear to be the first instance of thinking about mapping the planet in this way. Many more of them subsequently were invented. Fig. 4. Da Vinci's mappemondefrom c. 4.
In general, the models under discussion here start with a platonic solid. Besides octahedra (having 8 facets), we have seen examples of dodecahedra (12), icosahedra (20) and truncated icosahedra (32, itself a polyhedral subdivision). 4 illustrates have been proposed but will not be dealt with here. To our knowledge, no one has suggested using the simplest polyhedron - - a tetrahedron (4 facets) - - as the basis for a global spatial data model. Regardless of its orientation, it would generate an even more non-intuitive coordinate system, a stranger distribution of land masses, and introduce more projection distortions than larger polytopes make necessary.
A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences) by Geoffrey H. Dutton