New PDF release: Advances in Geoinformatics: VIII Brazilian Symposium on

By Clodoveu A.D. Jr. Davis, Antonio M.V.M. Monteiro

ISBN-10: 3540734139

ISBN-13: 9783540734130

ISBN-10: 3540734147

ISBN-13: 9783540734147

The GeoInfo sequence of medical meetings is an annual discussion board for exploring learn, improvement and leading edge functions in geographic info technological know-how and comparable parts. This e-book presents a privileged view of what's at present 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 contains fresh examine effects on spatial databases, spatial ontologies, computational geometry and visualization for geographic details structures, geostatistics and spatial records, spatial research, interoperability, and cutting edge functions of geotechnologies.

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Additional resources for Advances in Geoinformatics: VIII Brazilian Symposium on Geoinformatics, GEOINFO 2006, Campos do Jordão (SP), Brazil, November 19-22, 2006

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The region of interest was subdivided into 1x1, 2x2, 4x4, 8x8, 16x16, 32x32, 64x64, 128x128 grids, that is, 2xx2x grids, where x = 0,…, 7. Each one of these grids divides the chart into 1, 4, 8, 16, 64, 256, 1,024, 4,096, and 16,384 indexed cells. For each 3-tupla configuration , the same region of interest flyover was executed. This flyover performed random trajectories, passing through locations on edge and on the center of the chart. A complete description of these random trajectories can be found on Mello & Ferreira [18].

Observe, in line 09, that the algorithm first stores the indices in a linked list. This is because, before processing, it does not know the number of crossings. After the computation, the content of the list is finally copied to the array, for which enough memory has been allocated (line 13). Since the search for crossings is done from i+1 to j (line 06), the indices of the crossed line segments are stored in ascending order. The ordered array has a specific purpose in the update stage. In the update stage, to determine the number of crossings of the upward ray from f with the subpolylines Pik and Pkj, the algorithm adopts the following strategy.

If the number of crossings is odd, the feature is on the wrong side; otherwise, it is on the correct side (Figures 10(a) and 10(b)). For elucidating how the linear feature consistency works, we introduce the parity property as follows. Two points are considered to be on the same side of a polygon, if a line connecting them crosses the polygon an even number of times. Otherwise, they are considered to be on opposite sides. Figures 10(c) and 10(d) illustrate two examples of the parity property. Notice that the crossings on self-intersecting points of a polyline are counted as many as the number of segments that intersect on it.

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Advances in Geoinformatics: VIII Brazilian Symposium on Geoinformatics, GEOINFO 2006, Campos do Jordão (SP), Brazil, November 19-22, 2006 by Clodoveu A.D. Jr. Davis, Antonio M.V.M. Monteiro


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