Education and demonstration – Geography
Patent
1990-01-24
1991-07-09
Apley, Richard J.
Education and demonstration
Geography
364419, 434153, G09B 2900
Patent
active
050301179
ABSTRACT:
A global mapping system which organizes mapping data into a hierarchy of successive magnitudes or levels for presentation of the mapping data with variable resolution, starting from a first or highest magnitude with lowest resolution and progressing to a last or lowest magnitude with highest resolution. The idea of this hierarchical structures can be likened to a pyramid with fewer stones or "tiles" at the top, and where each successive descending horizontal level or magnitude contains four times as many "tiles" as the level or magnitude directly above it. The top or first level of the pyramid contains 4 tiles, the second level contains 16 tiles, the third contains 64 tiles and so on, such that the base of a 16 magnitude or level pyramid would contain 4 to the 16th power or 4,294,967,296 tiles. This total includes "hyperspace" which is later clipped or ignored. Digital data corresponding to each of the separate data base tiles is stored in the database under a unique filename.
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patent: 4773861 (1989-09-01), Dufour
Proceedings of the IEEE 1986 National Aerospace and Electronics Conference, Naecon 1986, vol. 1, pp. 79-86, "An Efficient Data Hierarchy for Integrating Background Image Information in an Aircraft Map System".
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Proceedings Pattern Recognition, 1982 pp. 802-805, "Picture Understanding and Retrieving System of Weather Chart".
IEEE Transactions on Pattern Analysis and Machine Intelligence, vol. PAMI-6, No. 3, May 1984, pp. 365-369, "On Encoding Boundaries with Quadtrees".
Apley Richard J.
Richman Glenn
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