Download Advances in Geoinformatics: VIII Brazilian Symposium on by Clodoveu A.D. Jr. Davis, Antonio M.V.M. Monteiro PDF

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

ISBN-10: 3540734139

ISBN-13: 9783540734130

The GeoInfo sequence of clinical meetings is an annual discussion board for exploring learn, improvement and cutting edge purposes in geographic details technological know-how and similar components. This publication offers 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 study issues many years from now. also, it comprises contemporary learn effects on spatial databases, spatial ontologies, computational geometry and visualization for geographic info platforms, geostatistics and spatial facts, spatial research, interoperability, and leading edge functions of geotechnologies.

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

Example text

Peucker, T. K. (1973). Algorithms for the reduction of the number of points required for represent a digitized line or its caricature. Canadian Cartographer, 10 (2), 112-122. , & Urvin, T. (1998). Self Evaluating Generalization Algorithms to Automatically Derive Multi Scale Boundary Sets. The 8th International Symposium on Spatial Data Handling, (pp. 361372). Vancouver, Canada. [5] Jenks, G. F. (1981). Lines, Computers and Human Frailties. Annals of the Association of American Geographers, 71, pp.

Let us consider the application of Saalfeld’s algorithm under tolerance f to the polyline P of Figure 13(a). Because of the f-tolerance, the first step (RDP algorithm) adds no vertices to P'. In the second step the algorithm first calculates the number of crossings of the points p1, p2, and p3 and classifies their sidedness (Figure 13(b)). Since p3 is on the wrong side, it adds the farthest vertex v4 and updates the sidedness classification of p3, which is inside the triangle ¨v1v4v8 (Figure 13(c)).

Notice that the processing times of the array of crossings are very close to the ones of the triangle inversion test, even for the map with more points. This is because the number of crossings is very small when compared to the number of vertices of the polylines. Thus, the performance of the algorithms can be considered equivalent. An important result that we achieved with our proposal is that the additional number of vertices that is required Consistent Handling of Linear Features in Polyline Simplification 15 to preserve the topological consistency is insignificant.

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