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New PDF release: A Hierarchical Coordinate System for Geoprocessing and

By Geoffrey H. Dutton

ISBN-10: 3540649808

ISBN-13: 9783540649809

Whilst spatial facts is digitized to be used in geographic details platforms and different software program, information regarding its unique scale, solution and accuracy is usually misplaced. for that reason, utilizing such details at diverse scales and mixing it with information from different assets should be tricky. Mapping vector information at smaller than the unique scale calls for its generalization, that is often dealt with through post-processing in ways in which are just weakly supported by means of databases. The types and strategies defined during this booklet triumph over many such difficulties via 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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Extra info for A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences)

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Still, there are some senses in which our approach is more universal than existing vector and raster data architectures: it is global (planetary) in scope, and represents features at a hierarchy of resolution (scales), properties which make it applicable to a broad range of geospatial applications, not just world-wide ones, and not simply for cartographic purposes. And while the new generalization methods developed by this effort seem to work quite well, perhaps the basic contribution to map generalization is more diagnostic than prescriptive.

This information might be keyed to feature identifiers to link it to geometric objects. 5 shows this type of schema, where lower levels of metadata record changes in data quality from the norms for higher levels of abstraction, hence need not be specified for any "normal" object. There are several problems with this approach, discussed below and in (Dutton 1992). However defined, such metadata records are "auxiliary" data structures, stored separately from descriptions of the geometry and topology of spatial features.

5. Hexahedral world projection, vertices at poles (Snyder 1992: 17) The best known polyhedral projection today is probably R. Buckminster Fuller's Dymaxion map, dating from the early 1940's (Unknown, 1943). As described in that Life Magazine article, the Dymaxion map was first based on a cubeoctahedron. A few years later Fuller recast it as an icosahedron, oriented to the earth in a way that placed alll2 of its vertices in the oceans and minimized the 30 2 Historical and Conceptual Background division of land areas between its 20 facets.

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A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences) by Geoffrey H. Dutton


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