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 structures and different software program, information regarding its unique scale, answer and accuracy is often misplaced. therefore, utilizing such details at varied scales and mixing it with info from different assets might be tough. Mapping vector information 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 through databases. The types and strategies defined during this booklet conquer many such difficulties by means of supplying a multi-resolution information 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)

Example text

A system's architecture limits what types of phenomena are representable by specifying the abstraction mechanisms used to encode them. Within these limits, considerable freedom may be provided to database architects (users who design database schemata for GIS projects) in the ways that real-world entities and phenomena may be described and quantified. Decisions must be made, for example, whether to put hydrographic features on one layer, or partition them into layers for lakes, streams and other water bodies.

Every facet is defined by three mesh nodes at which (with six exceptions) six facets meet. When a node lies on the edge of an octant, three of its incident facets lie in one octant's quadtree; the other three are stored in an adjoining one. A similar relation holds true for any node, not just those along the edges of octants; facets incident at a node are cousins, not siblings, and relating objects that span them can be awkward in quadtrees. 4 For many purposes, attractors are as important for retrieving locational data as QTM addresses are for encoding them.

Clarke 1994) In the digital realm, almost all applications of global tessellations involve the use of map projections, some examples of which are given above. 4) is no exception to this. We make use of a map projection (Dutton 1991) when transforming QTM addresses from and to latitudes and longitudes, called the Zenithial OrthoTriangular projection (ZOT), as it is an azimuthal projection that creates uniform right triangles out of QTM facets (which are not uniform on the sphere). The projection can be centered on any octahedral vertex (we use a North polar aspect), and maps an octahedron to a square in which the opposite (South) pole occupies the four corners and the equator connects the centers of sides.

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