By Clodoveu A.D. Jr. Davis, Antonio M.V.M. Monteiro
The GeoInfo sequence of medical meetings is an annual discussion board for exploring study, improvement and cutting edge purposes in geographic details technology and similar components. This publication presents a privileged view of what's at the moment taking place within the box of geoinformatics, and a preview of what may be the warmer advancements and examine subject matters many years from now. also, it comprises contemporary examine effects on spatial databases, spatial ontologies, computational geometry and visualization for geographic info structures, geostatistics and spatial data, spatial research, interoperability, and cutting edge functions of geotechnologies.
Read or Download Advances in Geoinformatics: VIII Brazilian Symposium on Geoinformatics, GEOINFO 2006, Campos do JordÃƒÂ£o (SP), Brazil, November 19-22, 2006 PDF
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Additional info for Advances in Geoinformatics: VIII Brazilian Symposium on Geoinformatics, GEOINFO 2006, Campos do JordÃƒÂ£o (SP), Brazil, November 19-22, 2006
2 Events Examples. Intersections segments Event 42 V. L. Rodrigues, M. V. A. Andrade, G. R. Queiroz, M. A. de Magalhães The events are stored in a list E, named event scheduler, that is sorted in non-decreasing order by the x values. This list is initialized with the extreme points of all segments. The algorithm also uses a list L to store the segments that are intersected by the sweep line – these segments are called active segments and the list is sorted in non-decreasing order by the y values.
F. C. F. Silva 6 Results The time spent by the graphical device to draw the scene into the monitor screen is inversely influenced by the quantity of geometrical primitives. The frustum culling algorithm, combined with Douglas-Peucker generalization, contributes for reducing the number of geometries necessary for the exhibition, and consequently, influences the system performance improvement. It was executed several tests in order to analyze the influence of the cells size on the three-dimensional visualization application performance.
14 A. C. G. -T. Wu 5 Results To validate our theoretical study of consistency for linear features, we present some results of our approach and compare them to those obtained by Saalfeld’s algorithm. We examine the basic cases where Saalfeld’s strategy fails in preserving the original polyline topology. For each image, the first square presents the original polyline, the second square shows the outline of Saalfeld’s algorithm, and the third square exhibits the outline of our approach. The results represent typical cases of intersections (Figures 17(a) and 17(b)), self-intersections (Figures 17(c) and 17(d)), and misplaced point features (Figures 17(e) and 17(f)) that occurs in Saalfeld’s algorithm and are correctly handle by our procedure.