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dc.contributor.authorOliveira, João Fradinho
dc.contributor.authorZiebart, Marek
dc.contributor.authorIliffe, Jonathan
dc.contributor.authorTurner, James
dc.contributor.authorRobson, Stuart
dc.contributor.editorSkala, Václav
dc.identifier.citationJournal of WSCG. 2013, vol. 21, no. 1, p. 79-88.en
dc.identifier.issn1213–6972 (hardcopy)
dc.identifier.issn1213-6980 (CD-ROM)
dc.identifier.issn1213–6964 (on-line)
dc.description.abstract“Trixel Buffers is a new spatial data-structure for fast point in multiple polygon inclusion queries. The algorithm utilizes a pre-processing step in which the inside/outside status of a quadtree´s leaf triangles without polygon geometry is pre-computed automatically; at run-time point queries lying within these triangles simply inherit their inclusion status. If a point query lies in a leaf triangle enclosing polygon vertices or crossing edges, a ray is fired from the point towards the triangle center whose polygon inclusion properties has also been pre-computed: rules are then applied to the intersection count and center-point properties to infer the polygon inclusion status. Our main contribution is that rays need not be followed until the polygon limits, and consequently the algorithm is I/O bound with shallow trees. It took 1h36m rather than days of using a standard ray test to determine the multiple polygon (~270,000 line segments) inclusion of 1.75 billion points on a 2.5GHz DuoCore computer.en
dc.format10 s.cs
dc.publisherVáclav Skala - Union Agencycs
dc.relation.ispartofseriesJournal of WSCGen
dc.rights© Václav Skala - UNION Agencycs
dc.subjectprostorová datacs
dc.subjectzpracování obrazucs
dc.subjectbatymerická datacs
dc.subjecttrixel bufferycs
dc.titleTrixel Buffer Logic for I/O Bound Point in N-Polygon Inclusion Tests of Massive Bathymetric Dataen
dc.subject.translatedspatial dataen
dc.subject.translatedimage processingen
dc.subject.translatedbathymeric dataen
dc.subject.translatedtrixel buffersen
Appears in Collections:Volume 21, Number 1 (2013)

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Please use this identifier to cite or link to this item: http://hdl.handle.net/11025/6872

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