View dependent query of multi-resolution clustered 3D dataset
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United States of America Patent
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Sep 27, 2016
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app pub date -
May 12, 2011
filing date -
May 12, 2011
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Abstract
In one embodiment, data of a data set that describes the topography of a three-dimensional surface (e.g., a DTM) is obtained at a resolution appropriate for visualization on a display screen. The data is organized into a number of resolutions by spatial indexing. A lowest resolution cluster of data is selected. For any visible data in the selected cluster of data for a type of visualization to be shown on the display screen, a point density in a coordinate system of the display screen resulting from data is compared to a configured threshold. If the point density in the display screen's coordinate system is below the configured threshold, visible data in the selected cluster of data is returned for display. If the point density in the display screen's coordinate system is above the configured threshold, one or more next-higher resolution clusters of data are selected, and the technique repeated.
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