A Multiresolution topographic surface database |
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| Authors: | J Mark Ware Christopher B Jones |
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| Institution: | Department of Computer Studies , The University of Glamorgan , Mid Glamorgan, Pontypridd, Wales, UK |
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| Abstract: | Abstract Multiresolution data structures provide a means of retrieving geographical features from a database at levels of detail which are adaptable to different scales of representation. A database design is presented which integrates multi-scale storage of point, linear and polygonal features, based on the line generalization tree, with a multi-scale surface model based on the Delaunay pyramid. The constituent vertices of topologically-structured geographical features are thus distributed between the triangulated levels of a Delaunay pyramid in which triangle edges are constrained to follow those features at differing degrees of generalization. Efficient locational access is achieved by imposing a spatial index on each level of the pyramid. |
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