By Geoffrey H. Dutton
Whilst spatial info is digitized to be used in geographic info structures and different software program, information regarding its unique scale, solution and accuracy is usually misplaced. therefore, utilizing such details at diverse scales and mixing it with facts from different assets should be tough. Mapping vector facts at smaller than the unique scale calls for its generalization, that is often dealt with by way of post-processing in ways in which are just weakly supported via databases. The versions and strategies defined during this e-book triumph over many such difficulties by means of supplying a multi-resolution facts illustration that permits retrieval of map information at a hierarchy of scales, in addition to documenting the accuracy of each spatial coordinate.
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Additional info for A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences)
While this is not in itself a spatial indexing method, it does not preclude also using the model for this purpose. An approach to spatial indexing is explored in chapter 4, exploiting the properties of nodal regions called attractors. Before moving on to these concerns, however, the next chapter will examine the computational properties of the quaternary triangular mesh hierarchy, both good and bad, actual and hypothetical. 3 Computational Aspects of a Quaternary Triangular Mesh We shape clay into a pot, but it is the emptiness inside that holds whatever we want.
But they directly denote position, and do so at multiple, nested resolutions. 3 These properties are achieved through the use of a geometric computational model that, starting with an oetahedron we imagine to be embedded in the Earth, subdivides its eight faces" into four each, proceeding to recursively subdivide each of the 32 resulting triangular facets (also called quadrants) into four children. 3. While all facets can be subdivided in the same way, in practice this is not done everywhere, but only where one has point positions to encode.
It is, however, worthy of attention from a cartographical point of view, not merely on account of the remarkable projection, never before employed, but also because it is one of the first maps on which a south-polar continent is laid down. It is likewise, if not the first, at least one of the first mappemondes with the name America. (Nordenski~ld 1889:76-77) Whoever made this sketch was clearly copying a globe, yet the octahedral symmetry in double polar aspect is still startling. The east-west orientation places meridian zero not in the Atlantic, as might be expected (many maps from the period show a prime meridian at about 10 ° W), but roughly through Lisbon, indicating the globe might have been of Portuguese origin.
A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences) by Geoffrey H. Dutton