By Geoffrey H. Dutton

ISBN-10: 3540649808

ISBN-13: 9783540649809

Whilst spatial info is digitized to be used in geographic details platforms and different software program, information regarding its unique scale, solution and accuracy is often misplaced. hence, utilizing such details at various scales and mixing it with info from different assets can be tricky. Mapping vector info at smaller than the unique scale calls for its generalization, that is frequently dealt with through post-processing in ways in which are just weakly supported by means of databases. The types and strategies defined during this e-book triumph over many such difficulties through offering a multi-resolution information illustration that permits retrieval of map facts at a hierarchy of scales, in addition to documenting the accuracy of each spatial coordinate.

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

Sample text

The addressing scheme for SQT is like that for QTM (using digits 1-4 instead of 0-3), but starting with an icosahedron results in a forest of 20 quadtrees rather than eight. As a result, relations between individual trees occur more often and are more complex than those in QTM, involving more rotations. 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.

8. S. Environmental Protection Agency's EMAP (Environmental Monitoring and Assessment Program) effort. S. and its territories), which would have equal area hierarchical sampling units. Statistical considerations (minimizing distance variance between sample points) pointed toward using a basis polyhedron with a large number of facets, and the one selected (a truncated icosahedron, familiar as a soccer ball, and also as the Fullerene carbon molecule) has 32 of them, 20 hexagons and 12 pentagons. 8 shows this shape, its soccer ball variant, and how it is oriented for use in EMAP.

Wickman's group preferred true equal area partitions, achieved by inserting "correction points" near the center of each chord, turning each edge from one into two great circle arcs, and positioning these points to make the resulting facets equal in spherical area. A numbering scheme was then devised that encoded the tessellation hierarchically with the digits 1-4. The system was coded in Fortran IV on an IBM 360175 computer. Truncated lcosahedron Soccerball EMAPModel Illustration courtesy of J.

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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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