Download A Hierarchical Coordinate System for Geoprocessing and by Geoffrey H. Dutton PDF

By Geoffrey H. Dutton

While spatial info is digitized to be used in geographic details platforms and different software program, information regarding its unique scale, answer and accuracy is often misplaced. hence, 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 by means of 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 by means of supplying a multi-resolution information illustration that permits retrieval of map info at a hierarchy of scales, in addition to documenting the accuracy of each spatial coordinate.

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A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences)

Whilst spatial information is digitized to be used in geographic details platforms and different software program, information regarding its unique scale, answer and accuracy is usually misplaced. accordingly, utilizing such details at assorted scales and mixing it with information from different assets could be tricky. Mapping vector info at smaller than the unique scale calls for its generalization, that is frequently dealt with via post-processing in ways in which are just weakly supported by means of databases.

Extra resources for A Hierarchical Coordinate System for Geoprocessing and Cartography (Lecture Notes in Earth Sciences)

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11 compares Fekete's SQT and Goodchild and Shirin's HDSH tessellations. Both are quaternary triangular meshes, but derive quite different characters from the polyhedra that root them. In the field of computer aided design and computer graphics, SchrOder and Sweldens (1995) describe using wavelets (Chui 1992) to describe functions and distributions (such as height fields or reflectance functions) on a sphere. Spheroids to be modeled are parameterized as an octahedron, then subdivided recursively into quadrants.

Algorithms were devised for finding neighbors, connected components, and other basic tasks, but SQT apparently was never developed any further. 11 compares Fekete's SQT and Goodchild and Shirin's HDSH tessellations. Both are quaternary triangular meshes, but derive quite different characters from the polyhedra that root them. In the field of computer aided design and computer graphics, SchrOder and Sweldens (1995) describe using wavelets (Chui 1992) to describe functions and distributions (such as height fields or reflectance functions) on a sphere.

Each such location is identified by a sequence of quaternary digits (from 0 to 3), having as many places as the number of times facets were divided in representing that point. We call each of these places a level, as it is equivalent to a certain level of spatial resolution. Our implementation allows for 29 levels of detail (in a 64-bit word), corresponding to about 2 cm of ground resolution, or to maps at a scale of 1:50 or larger. This should suffice for nearly all cartographic and analytic purposes.

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